Researcher basic information

• Massa Nakaoka

• Ph.D (Science), University of Tokyo

• https://researchmap.jp/massanakaoka?lang=en

• https://orcid.org/0000-0002-5722-3585
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201301006545088257
• http://www.fsc.hokudai.ac.jp/akkeshi/
• http://www.fsc.hokudai.ac.jp/akkeshi/en/index.html

• 90260520

• https://orcid.org/0000-0002-5722-3585

• 201301006545088257

• 沿岸生態系
• 海草
• 生態系機能
• 生物群集
• 生物多様性
• 海草藻場
• アマモ場
• 生態学
• 岩礁潮間帯
• ベントス
• 藻場
• 空間スケール
• 群集動態
• 生物間相互作用
• メタ個体群
• 野外操作実験
• 物質循環
• 群集
• 広域分散過程
• リモートセンシング・GIS
• 食物網
• 炭素吸収能
• 空間異質性
• 種間関係

• Environmental Science/Agriculture Science, Environmental dynamic analysis
• Life Science, Ecology and environment
• Environmental Science/Agriculture Science, Conservation of biological resources

• Bachelor's degree program, School of Science
• Master's degree program, Graduate School of Environmental Science
• Doctoral (PhD) degree program, Graduate School of Environmental Science

Research activity information

• 2003, Society of Population Ecology, Population Ecology Young Scientist Award
  Population and community ecology of marine benthic organisms: From single-species study to multi-disciplinary and multi-scale approaches for understanding processes and dynamics of open populations and communities

• Community structure of benthic amphipods in subtidal bottoms of Akkeshi Bay, northeastern Japan: effects of environmental gradients and biogeographic affinities
  Tomonori Sekioka; Kazushi Miyashita; Masahiro Nakaoka
  JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM, 105, 03 Sep. 2025
  English, Scientific journal
• Closing the parachute and opening the umbrella: Strategies for inclusivity and representation in producing impactful coastal ecosystem research
  Katie May Laumann; Nicholas M. Hoad; Lauren Alvaro; Shahrzad Lili Badri; Noirin Burke; Annie Carew; Guilherme N. Corte; Aldo Croquer; Yasmina Shah Esmaeili; Martha Farrell; Naoko Kouchi; Juhyung Lee; Masahiro Nakaoka; Lina Mtwana Nordlund; Rita I. Sellares-Blasco; Ed Sheldon; Maria F. Villalpando; Jonathan S. Lefcheck
  Cambridge Prisms: Coastal Futures, 3, Cambridge University Press (CUP), 05 Aug. 2025
  Scientific journal, Abstract
  
  Parachute science is the problematic and extractive practice of non-local researchers taking data, knowledge and information from communities of which they are not members, failing to engage the local community and local scientists, marginalizing them in most aspects of the research, and using the results to their own benefit. Perpetuated by colonialism and unequal access to resources such as funding, education and data, it is harmful to local scientists and undervalues the contributions of the community as a whole. Ultimately, it erodes trust within the scientific community and, more broadly, builds dependence on foreign researchers and makes science less global and collaborative. Increasing international and cross-cultural collaborations while being careful to avoid parachute science can help minimize these impacts. Here, we offer our perspectives on parachute science and suggestions on how to avoid it, based on our experiences conducting research internationally with diverse scientists and communities, including both academics and non-academics. Instead of a parachute, we suggest opening the scientific “umbrella” to incorporate diverse perspectives and local contributions in generating relevant and impactful scientific insight.
• Recent events and climate change impacts related to the environment, ecosystem, and fishery resources in northern Japanese coastal lagoons
  Hiroya Abe; Masahiro Nakaoka
  Estuarine, Coastal and Shelf Science, 318, 109251, 109251, Elsevier BV, Jul. 2025
  Scientific journal
• The genetic legacy of a global marine invader
  Erik E. Sotka; Ryan B. Carnegie; James T. Carlton; Lucia Couceiro; Jeffrey A. Crooks; Hikaru Endo; Hilary Hayford; Masakazu Hori; Mitsunobu Kamiya; Gen Kanaya; Judith Kochmann; Kun-Seop Lee; Lauren Lees; Hannah Miller; Masahiro Nakaoka; Eric Pante; Jennifer L. Ruesink; Evangelina Schwindt; Åsa Strand; Richard B. Taylor; Ryuta Terada; Martin Thiel; Takefumi Yorisue; Danielle Zacherl; Allan E. Strand
  Proceedings of the National Academy of Sciences, 122, 15, Proceedings of the National Academy of Sciences, 07 Apr. 2025
  Scientific journal, The massive geographic expansion of terrestrial plant crops, livestock, and marine aquacultured species during the 19th and 20th centuries provided local economic benefits, stabilized food demands, and altered local ecosystems. The invasion history of these translocations remains uncertain for most species, limiting our understanding of their future adaptive potential and historical roles as vectors for coinvaded species. We provide a framework for filling this gap in invasion biology using the widely transplanted Pacific oyster as a case study. A two-dimensional summary of population-level variation in single nucleotide polymorphisms in native Japan reflected the geographical map of Japan and allowed identification of the source regions for the worldwide expansion. Pacific oysters proliferate in nonnative areas with environmental temperatures similar to those areas where native lineages evolved. Using Approximate Bayesian Computation, we ranked the likelihood of historical oyster or shipping vectors to explain current-day distribution of genotypes in 14 coinvaded algal and animal species. Oyster transplants were a more likely vector than shipping for six species, shipping activity was more likely for five species, and a vector was ambiguous for three species. Applying this approach to other translocated species should reveal similar legacy effects, especially for economically important foundation species that also served as vectors for nonnative species.
• Risks of habitat loss from seaweed cultivation within seagrass
  Benjamin L. H. Jones; Johan S. Eklof; Richard K. F. Unsworth; Lucy Coals; Marjolijn J. A. Christianen; Julian Clifton; Leanne C. Cullen- Unsworth; Maricela de la Torre- Castro; Nicole Esteban; Mark Huxham; Narriman S. Jiddawi; Len J. Mckenzie; Masahiro Nakaoka; Lina M. Nordlund; Jillian L. S. Ooi; Anchana Prathep
  PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 122, 8, 25 Feb. 2025
  English
• Exploring the impact of the widely introduced Pacific oyster Magallana gigas on the dispersal of Bonamia (Haplosporida): a global snapshot
  KM Hill-Spanik; H Rothkopf; AE Strand; RB Carnegie; JT Carlton; L Couceiro; JA Crooks; H Endo; M Hori; M Kamiya; G Kanaya; J Kochmann; KS Lee; L Lees; M Nakaoka; E Pante; JL Ruesink; E Schwindt; Å Strand; R Taylor; R Terada; M Thiel; T Yorisue; D Zacherl; EE Sotka
  Diseases of Aquatic Organisms, 161, 39, 46, Inter-Research Science Center, 06 Feb. 2025
  Scientific journal, Bonamia (Haplosporida) are oyster parasites capable of devastating oyster populations. The near-circumglobal distribution of the host generalist B. exitiosa has previously been associated with the natural and anthropogenic dispersal of broadly distributed non-commercial oysters in the Ostrea stentina species complex. Here, we took a global snapshot approach to explore the role of the widely introduced Pacific oyster Magallana gigas, a commercially important species that can be found on every continent except Antarctica, in transporting Bonamia. We screened 938 M. gigas individuals from 41 populations in this oyster’s native and non-native geographic range for presence of Bonamia DNA using PCR. B. exitiosa was the only species detected and only within 2 of 5 populations from southern California, USA (10 and 42% PCR prevalence). Therefore, M. gigas could have played a role in transporting B. exitiosa to California (if introduced) and/or maintaining B. exitiosa populations within California, but morphological confirmation of infection needs to be done to better understand the host-parasite dynamics within this system. We detected no Bonamia DNA within any other non-native M. gigas populations (n = 302) nor within native M. gigas populations in Japan and Korea (n = 582) and thus found no evidence to support the co-dispersal of M. gigas and other Bonamia species. Lower sample sizes within some populations and the non-systematic nature of our sampling design may have led to false negatives, especially in areas where Bonamia are known to occur. Nevertheless, this global snapshot provides preliminary guidance for managing both natural and farmed oyster populations.
• Artificial Intelligence-Assisted Environmental DNA Metabarcoding and High-Resolution Underwater Optical Imaging for Noninvasive and Innovative Marine Environmental Monitoring
  Jing Yang; Chao Li; Linus Shing Him Lo; Xu Zhang; Zhikui Chen; Jing Gao; Clara U; Zhijun Dai; Masahiro Nakaoka; Huayong Yang; Jinping Cheng
  Journal of Marine Science and Engineering, 12, 10, 1729, 1729, MDPI AG, 01 Oct. 2024
  Scientific journal, To effectively protect the marine environment, it is crucial to establish effective environ mental monitoring platforms. Traditional marine environmental monitoring methods heavily rely on morphological identification and field expertise, with the sampling process being disruptive and potentially destructive to vulnerable marine environments. In light of emerging biomonitoring needs and biodiversity declines, we reviewed the urgently needed, ongoing advances in developing effective, noninvasive, and innovative monitoring methods and systems to examine the complex marine environment for better strategic conservation and protection, using the coral ecosystem as one of the representative forefront examples in marine protection. This review summarizes current trends and efforts in transitioning into more standardizable and automatable utilizations of environmental DNA metabarcoding-based monitoring strategies and high-resolution underwater optical imaging monitoring systems as two of the promising pillars for the next generation of noninvasive biomonitoring and associated applications. The assistance of artificial intelligence for environmental DNA metabarcoding and high-resolution underwater optical imaging into an empowered, all-rounded monitoring platform for enhanced monitoring capacity is discussed as a highly potent direction for future research exploration. This review will be a cornerstone reference for the future development of artificial intelligence-assisted, noninvasive, and innovative marine environmental monitoring systems.
• A Latitudinal Cline in the Taxonomic Structure of Eelgrass Epifaunal Communities is Associated With Plant Genetic Diversity
  Collin P. Gross; J. Emmett Duffy; Kevin A. Hovel; Pamela L. Reynolds; Christoffer Boström; Katharyn E. Boyer; Mathieu Cusson; Johan Eklöf; Aschwin H. Engelen; Britas Klemens Eriksson; F. Joel Fodrie; John N. Griffin; Clara M. Hereu; Masakazu Hori; A. Randall Hughes; Mikhail V. Ivanov; Pablo Jorgensen; Melissa R. Kardish; Claudia Kruschel; Kun‐Seop Lee; Jonathan Lefcheck; Karen McGlathery; Per‐Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Nessa E. O'Connor; Jeanine L. Olsen; Robert J. Orth; Bradley J. Peterson; Henning Reiss; Francesca Rossi; Jennifer Ruesink; Erik E. Sotka; Jonas Thormar; Fiona Tomas; Richard Unsworth; Erin P. Voigt; Matthew A. Whalen; Shelby L. Ziegler; John J. Stachowicz
  Global Ecology and Biogeography, 33, 12, Wiley, 30 Sep. 2024
  Scientific journal, ABSTRACT
  
  Aim
  
  Biogenic structural complexity increases mobile animal richness and abundance at local, regional and global scales, yet animal taxa vary in their response to complexity. When these taxa also vary functionally, habitat structures favouring certain taxa may have consequences for ecosystem function. We characterised global patterns of epifaunal invertebrates in eelgrass (Zostera marina) beds that varied in structural and genetic composition.
  
  Location
  
  North America, Europe and Asia.
  
  Time Period
  
  2014.
  
  Major Taxa Studied
  
  Peracarid crustaceans and gastropod molluscs.
  
  Methods
  
  We sampled epifaunal invertebrate communities in 49 eelgrass beds across 37° latitude in two ocean basins concurrently with measurements of eelgrass genetic diversity, structural complexity and other abiotic and biotic environmental variables. We examined how species richness, abundance and community composition varied with latitude and environmental predictors using a random forest approach. We also examined how functional trait composition varied along with community structure.
  
  Results
  
  Total species richness decreased with latitude, but this was accompanied by a taxonomic shift in dominance from peracarid crustaceans to gastropods, which exhibited different sets of functional traits. Greater eelgrass genetic diversity was strongly correlated with both richness and abundance of peracarids, but less so for gastropods.
  
  Main Conclusions
  
  Our results add to a growing body of literature that suggests genetic variation in plant traits influences their associated faunal assemblages via habitat structure. Because peracarids and gastropods exhibited distinct functional traits, our results suggest a tentative indirect link between broad‐scale variation in plant genetic diversity and ecosystem function.
• Effects of low salinity water inflow on eelgrass and cultured bivalves in subarctic lagoons: Analysis using hydrodynamic model
  Hiroya Abe; Mizuho Namba; Minako Abe Ito; Masahiro Nakaoka
  Regional Studies in Marine Science, 74, 103543, 103543, Elsevier BV, Sep. 2024
  Scientific journal
• Dietary exposure experiments on the migration of chemical pollutants from microplastics to bivalves
  Taichi Takano; Rei Sakurai; Mone Ota; Masahiro Nakaoka; Azusa Kinjo; Koji Inoue; Hideshige Takada; Kaoruko Mizukawa
  Marine Pollution Bulletin, 206, Sep. 2024
  Scientific journal
• Past and future climate effects on population structure and diversity of North Pacific surfgrasses
  Ana I. Tavares; Jorge Assis; Laura Anderson; Pete Raimondi; Nelson Castilho Coelho; Cristina Paulino; Lydia Ladah; Masahiro Nakaoka; Gareth A. Pearson; Ester A. Serrao
  Journal of Biogeography, 51, 10, 1999, 2010, Wiley, 02 Jun. 2024
  Scientific journal, Abstract
  
  Aim
  
  Understanding the impacts of past and future climate change on genetic diversity and structure is a current major research gap. We ask whether past range shifts explain the observed genetic diversity of surfgrass species and if future climate change projections anticipate genetic diversity losses. Our study aims to identify regions of long‐term climate suitability with higher and unique seagrass genetic diversity and predict future impacts of climate change on them.
  
  Location
  
  Northeast Pacific.
  
  Time Period
  
  Analyses considered a timeframe from the Last Glacial Maximum (LGM; 20 kybp) until one Representative Concentration Pathway (RCP) scenario of future climate changes (RCP 8.5; 2100).
  
  Major Taxa Studied
  
  Two seagrass species belonging to the genus Phyllospadix.
  
  Methods
  
  We estimated population genetic diversity and structure using 11 polymorphic microsatellite markers. We predicted the distribution of the species for the present, LGM, and near future (RCP 8.5, no climate mitigation) using Species Distribution Models (SDMs).
  
  Results
  
  SDMs revealed southward range shifts during the LGM and potential poleward expansions in the future. Genetic diversity of Phyllospadix torreyi decreases from north to south, but in Phyllospadix scouleri the trend is variable. Phyllospadix scouleri displays signals of genome admixture at the southernmost and northernmost edges of its distribution.
  
  Main Conclusions
  
  The genetic patterns observed in the present reveal the influence of climate‐driven range shifts in the past and suggest further consequences of climate change in the future, with potential loss of unique gene pools. This study also shows that investigating climate links to present genetic information at multiple timescales can establish a historical context for analyses of the future evolutionary history of populations.
• Trans-Arctic asymmetries, melting pots and weak species cohesion in the low-dispersal amphiboreal seaweed Fucus distichus
  João Neiva; Jorge Assis; Eliza Fragkopoulou; Gareth A. Pearson; Peter T. Raimondi; Laura Anderson; Dorte Krause-Jensen; Núria Marbà; Andrew Want; Olga Selivanova; Masahiro Nakaoka; W. Stewart Grant; Brenda Konar; Michael Y. Roleda; Mikael K. Sejr; Cristina Paulino; Ester A. Serrão
  Frontiers in Ecology and Evolution, 12, Frontiers Media SA, 18 Apr. 2024
  Scientific journal, Amphiboreal taxa are often composed of vicariant phylogroups and species complexes whose divergence and phylogeographic affinities reflect a shared history of chronic isolation and episodic trans-Arctic dispersal. Ecological filters and shifting selective pressures may also promote selective sweeps, niche shifts and ecological speciation during colonization, but these are seldom considered at biogeographical scales. Here we integrate genetic data and Ecologic Niche Models (ENMs) to investigate the historical biogeography and cohesion of the polymorphic rockweed Fucus distichus throughout its immense amphiboreal range, focusing on trans-Arctic asymmetries, glacial/interglacial dynamics, and integrity of sympatric eco-morphotypes. Populations were sampled throughout the Pacific and the Atlantic, from southern rear-edges to the high-Arctic. They were genotyped for seven microsatellites and an mtDNA spacer, and genetic diversity and structure were assessed from global to local scales. ENMs were used to compare niche divergence and magnitude of post-glacial range shifts in Pacific versus Atlantic sub-ranges. Haplotypic and genotypic data revealed distinct and seemingly isolated Pacific vs Arctic/Atlantic gene-pools, with finer-scale regional sub-structuring pervasive in the Pacific. MtDNA diversity was highly structured and overwhelmingly concentrated in the Pacific. Regionally, Alaska showed the highest intra-population diversity but the lowest levels of endemism. Some sympatric/parapatric ecotypes exhibited distinct genotypic/haplotypic compositions. Strikingly, niche models revealed higher Pacific tolerance to maximum temperatures and predicted a much more consolidated presence in the NE Atlantic. Glacial and modern ranges overlapped extensively in the Pacific, whereas the modern Atlantic range was largely glaciated or emerged during the Last Glacial Maximum. Higher genetic and ecogeographic diversity supports a primary Pacific diversification and secondary Atlantic colonization, also likely reflecting the much larger and more stable climatic refugia in the Pacific. The relic distribution and reduced ecological/morphological plasticity in the NE Atlantic are hypothesized to reflect functional trans-Arctic bottlenecks, recent colonization or competition with congeners. Within the Pacific, Alaska showed signatures of a post-glacial melting pot of eastern and southern populations. Genetic/ecotypic variation was generally not sufficiently discontinuous or consistent to justify recognizing multiple taxonomic entities, but support a separate species in the eastern Pacific, at the southern rear-edge. We predict that layered patterns of phylogeographic structure, incipient speciation and niche differences might be common among widespread low-dispersal amphiboreal taxa.
• Changes in Seagrass Community Structure in Response to Sediment Load and Excess Nutrients, and its implication to Carbon Stocks in the Berau Marine Conservation Area
  Agustin Rustam; Mariska A. Kusumaningtyas; Hadiwijaya L. Salim; Devi Dwiyanti Suryono; Restu Nur Afi Ati; Nasir Sudirman; August Daulat; Terry L. Kepel; Yusmiana P. Rahayu; Dini Purbani; Semeidi Husrin; Novi S. Adi; Masahiro Nakaoka; T. E.Angela L. Quiros; Yoshiyuki Tanaka; Toshihiro Miyajima; Andreas A. Hutahaean; Kazuo Nadaoka
  Journal of Ecological Engineering, 25, 9, 156, 168, 2024
  Scientific journal
• The linkage between spatial and temporal variations in epifaunal and primary producer communities in eelgrass (Zostera marina) beds
  Mizuho Namba; Hiroya Abe; Minako Abe Ito; Masahiro Nakaoka
  Estuarine, Coastal and Shelf Science, Jan. 2024, [Peer-reviewed]
  Scientific journal
• A global biodiversity observing system to unite monitoring and guide action
  Andrew Gonzalez; Petteri Vihervaara; Patricia Balvanera; Amanda E. Bates; Elisa Bayraktarov; Peter J. Bellingham; Andreas Bruder; Jillian Campbell; Michael D. Catchen; Jeannine Cavender-Bares; Jonathan Chase; Nicholas Coops; Mark J. Costello; Bálint Czúcz; Aurélie Delavaud; Maria Dornelas; Grégoire Dubois; Emmett J. Duffy; Hilde Eggermont; Miguel Fernandez; Nestor Fernandez; Simon Ferrier; Gary N. Geller; Michael Gill; Dominique Gravel; Carlos A. Guerra; Robert Guralnick; Michael Harfoot; Tim Hirsch; Sean Hoban; Alice C. Hughes; Wim Hugo; Margaret E. Hunter; Forest Isbell; Walter Jetz; Norbert Juergens; W. Daniel Kissling; Cornelia B. Krug; Peter Kullberg; Yvan Le Bras; Brian Leung; Maria Cecilia Londoño-Murcia; Jean-Michel Lord; Michel Loreau; Amy Luers; Keping Ma; Anna J. MacDonald; Joachim Maes; Melodie McGeoch; Jean Baptiste Mihoub; Katie L. Millette; Zsolt Molnar; Enrique Montes; Akira S. Mori; Frank E. Muller-Karger; Hiroyuki Muraoka; Masahiro Nakaoka; Laetitia Navarro; Tim Newbold; Aidin Niamir; David Obura; Mary O’Connor; Marc Paganini; Dominique Pelletier; Henrique Pereira; Timothée Poisot; Laura J. Pollock; Andy Purvis; Adriana Radulovici; Duccio Rocchini; Claudia Roeoesli; Michael Schaepman; Gabriela Schaepman-Strub; Dirk S. Schmeller; Ute Schmiedel; Fabian D. Schneider; Mangal Man Shakya; Andrew Skidmore; Andrew L. Skowno; Yayioi Takeuchi; Mao-Ning Tuanmu; Eren Turak; Woody Turner; Mark C. Urban; Nicolás Urbina-Cardona; Ruben Valbuena; Anton Van de Putte; Basile van Havre; Vladimir Ruslan Wingate; Elaine Wright; Carlos Zambrana Torrelio
  Nature Ecology & Evolution, 7, 12, 1947, 1952, Springer Science and Business Media LLC, 24 Aug. 2023
  Scientific journal
• Hydrodynamics rather than type of coastline shapes self‐recruitment in anemonefishes
  Masaaki Sato; Kentaro Honda; Yohei Nakamura; Lawrence Patrick C. Bernardo; Klenthon O. Bolisay; Takahiro Yamamoto; Eugene C. Herrera; Yuichi Nakajima; Chunlan Lian; Wilfredo H. Uy; Miguel D. Fortes; Kazuo Nadaoka; Masahiro Nakaoka
  Limnology and Oceanography, Wiley, 25 Jul. 2023
  Scientific journal
• Ocean current patterns drive the worldwide colonization of eelgrass (Zostera marina)
  Lei Yu; Marina Khachaturyan; Michael Matschiner; Adam Healey; Diane Bauer; Brenda Cameron; Mathieu Cusson; J. Emmett Duffy; F. Joel Fodrie; Diana Gill; Jane Grimwood; Masakazu Hori; Kevin Hovel; A. Randall Hughes; Marlene Jahnke; Jerry Jenkins; Keykhosrow Keymanesh; Claudia Kruschel; Sujan Mamidi; Damian M. Menning; Per-Olav Moksnes; Masahiro Nakaoka; Christa Pennacchio; Katrin Reiss; Francesca Rossi; Jennifer L. Ruesink; Stewart T. Schultz; Sandra Talbot; Richard Unsworth; David H. Ward; Tal Dagan; Jeremy Schmutz; Jonathan A. Eisen; John J. Stachowicz; Yves Van de Peer; Jeanine L. Olsen; Thorsten B. H. Reusch
  Nature Plants, 9, 8, 1207, 1220, Springer Science and Business Media LLC, 20 Jul. 2023
  Scientific journal, Abstract
  
  Currents are unique drivers of oceanic phylogeography and thus determine the distribution of marine coastal species, along with past glaciations and sea-level changes. Here we reconstruct the worldwide colonization history of eelgrass (Zostera marina L.), the most widely distributed marine flowering plant or seagrass from its origin in the Northwest Pacific, based on nuclear and chloroplast genomes. We identified two divergent Pacific clades with evidence for admixture along the East Pacific coast. Two west-to-east (trans-Pacific) colonization events support the key role of the North Pacific Current. Time-calibrated nuclear and chloroplast phylogenies yielded concordant estimates of the arrival of Z. marina in the Atlantic through the Canadian Arctic, suggesting that eelgrass-based ecosystems, hotspots of biodiversity and carbon sequestration, have only been present there for ~243 ky (thousand years). Mediterranean populations were founded ~44 kya, while extant distributions along western and eastern Atlantic shores were founded at the end of the Last Glacial Maximum (~19 kya), with at least one major refuge being the North Carolina region. The recent colonization and five- to sevenfold lower genomic diversity of the Atlantic compared to the Pacific populations raises concern and opportunity about how Atlantic eelgrass might respond to rapidly warming coastal oceans.
• Modeling desirable futures at local scale by combining the nature futures framework and multi-objective optimization
  Chihiro Haga; Marimi Maeda; Wataru Hotta; Takanori Matsui; Masahiro Nakaoka; Junko Morimoto; Hideaki Shibata; Shizuka Hashimoto; Osamu Saito; Sana Okayasu; HyeJin Kim; Garry Peterson
  Sustainability Science, Springer Science and Business Media LLC, 10 Mar. 2023
  Scientific journal, Abstract
  
  Envisioning positive scenarios that recognize the multiple values of nature is fundamental for designing transformative changes in local socio-ecological systems. This study developed a protocol with three specifications for operationalizing the Nature Futures Framework (NFF) in a landscape scenario analysis using a multi-objective optimization framework composed of: (1) exploring nature-positive futures, (2) seeking alternative pathways for targets satisfying visions of plural values, and (3) screening key direct drivers to achieve the targets. This research conducted a case study of a rural landscape in northeastern Japan. First, 110 strategies of landscape management options were simulated from 2015 to 2100 using a forest landscape model, LANDIS-II. The simulation developed a data frame of four integrated indicators of the NFF values for each year and strategy. Second, nature-positive strategies were screened using the common values. Pareto optimal strategies were then identified to obtain equally good solutions. Finally, the key response options to achieve good nature-positive futures were identified using decision tree analysis. Our protocol identified (1) multiple, but few nature-positive and Pareto optimal strategies that satisfied NFF visions, (2) nature-positive, but not Pareto optimal strategies, and (3) non-nature-positive strategies. In most Pareto optimal strategies, the maximized value perspectives changed over time. Our protocol also identified key response options to achieve three different NFF value perspectives in the case study area: (1) clear or selective cutting in forestry and (2) solar PV installation on abandoned pastureland in agriculture and energy sectors. We discussed the implication for local landscape management, localizing NFF narratives to develop future scenarios and modeling practice of NFF. The protocol does not depend on a specific model and indicator. Thus, our scalable protocol can be applied to scenarios and model practices in any region to support envisioning plausible, feasible, and positive futures, and designing future stakeholder collaboration.
• The significance of trophic transfer of microplastics in the accumulation of plastic additives in fish: An experimental study using brominated flame retardants and UV stabilizers
  Takaaki Hasegawa; Kaoruko Mizukawa; Bee Geok Yeo; Tomonori Sekioka; Hideshige Takada; Masahiro Nakaoka
  Marine Pollution Bulletin, 185, 114343, 114343, Elsevier BV, Dec. 2022, [Last author, Corresponding author]
  Scientific journal
• Microplastic in cultured oysters from different coastal areas of Japan
  Liu Yang; Masahiro Nakaoka; Takashi Matsuishi; Toshikazu Kawaguchi; Helena Fortunato
  Journal of Marine Science: Research & Development, 12:, 360, 03 Oct. 2022, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• A Pleistocene legacy structures variation in modern seagrass ecosystems
  J. Emmett Duffy; John J. Stachowicz; Pamela L. Reynolds; Kevin A. Hovel; Marlene Jahnke; Erik E. Sotka; Christoffer Boström; Katharyn E. Boyer; Mathieu Cusson; Johan Eklöf; Aschwin H. Engelen; Britas Klemens Eriksson; F. Joel Fodrie; John N. Griffin; Clara M. Hereu; Masakazu Hori; A. Randall Hughes; Mikhail V. Ivanov; Pablo Jorgensen; Claudia Kruschel; Kun-Seop Lee; Jonathan S. Lefcheck; Per-Olav Moksnes; Masahiro Nakaoka; Mary I. O’Connor; Nessa E. O’Connor; Robert J. Orth; Bradley J. Peterson; Henning Reiss; Katrin Reiss; J. Paul Richardson; Francesca Rossi; Jennifer L. Ruesink; Stewart T. Schultz; Jonas Thormar; Fiona Tomas; Richard Unsworth; Erin Voigt; Matthew A. Whalen; Shelby L. Ziegler; Jeanine L. Olsen
  Proceedings of the National Academy of Sciences, 119, 32, Proceedings of the National Academy of Sciences, 09 Aug. 2022
  Scientific journal, Distribution of Earth’s biomes is structured by the match between climate and plant traits, which in turn shape associated communities and ecosystem processes and services. However, that climate–trait match can be disrupted by historical events, with lasting ecosystem impacts. As Earth’s environment changes faster than at any time in human history, critical questions are whether and how organismal traits and ecosystems can adjust to altered conditions. We quantified the relative importance of current environmental forcing versus evolutionary history in shaping the growth form (stature and biomass) and associated community of eelgrass ( Zostera marina ), a widespread foundation plant of marine ecosystems along Northern Hemisphere coastlines, which experienced major shifts in distribution and genetic composition during the Pleistocene. We found that eelgrass stature and biomass retain a legacy of the Pleistocene colonization of the Atlantic from the ancestral Pacific range and of more recent within-basin bottlenecks and genetic differentiation. This evolutionary legacy in turn influences the biomass of associated algae and invertebrates that fuel coastal food webs, with effects comparable to or stronger than effects of current environmental forcing. Such historical lags in phenotypic acclimatization may constrain ecosystem adjustments to rapid anthropogenic climate change, thus altering predictions about the future functioning of ecosystems.
• Eelgrass beds can mitigate local acidification and reduce oyster malformation risk in a subarctic lagoon, Japan: A three-dimensional ecosystem model study
  Hiroya Abe; Minako Abe Ito; Hyojin Ahn; Masahiro Nakaoka
  Ocean Modelling, 173, 101992, 101992, Elsevier BV, May 2022, [Corresponding author]
  Scientific journal
• Plastic and natural inorganic microparticles do not differ in their effects on adult mussels (Mytilidae) from different geographic regions.
  Thea Hamm; Jonas Barkhau; Anna-Louise Gabriel; Leo L Gottschalck; Maria Greulich; Daphne Houiller; Uki Kawata; Lukas Novaes Tump; Abril Sanchez Leon; Paulo Vasconcelos; Vincent Yap; Corrine Almeida; Zanna Chase; Catriona L Hurd; Jennifer L Lavers; Masahiro Nakaoka; Gil Rilov; Martin Thiel; Jeffrey T Wright; Mark Lenz
  The Science of the total environment, 811, 151740, 151740, 10 Mar. 2022, [International Magazine]
  English, Scientific journal, Microplastics are ubiquitous in the marine environment and studies on their effects on benthic filter feeders at least partly revealed a negative influence. However, it is still unclear whether the effects of microplastics differ from those of natural suspended microparticles, which constitute a common stressor in many coastal environments. We present a series of experiments that compared the effects of six-week exposures of marine mussels to two types of natural particles (red clay and diatom shells) to two types of plastic particles (Polymethyl Methacrylate and Polyvinyl Chloride). Mussels of the family Mytilidae from temperate regions (Japan, Chile, Tasmania) through subtropical (Israel) to tropical environments (Cabo Verde) were exposed to concentrations of 1.5 mg/L, 15 mg/L and 150 mg/L of the respective microparticles. At the end of this period, we found significant effects of suspended particles on respiration rate, byssus production and condition index of the animals. There was no significant effect on clearance rate and survival. Surprisingly, we observed only small differences between the effects of the different types of particles, which suggests that the mussels were generally equally robust towards exposure to variable concentrations of suspended solids regardless of whether they were natural or plastic. We conclude, that microplastics and suspended solids elicit similar effects on the tested response variables, and that both types of microparticles mainly cause acute responses rather than more persistent carry-over effects.
• The biogeography of community assembly: latitude and predation drive variation in community trait distribution in a guild of epifaunal crustaceans
  Collin P. Gross; J. Emmett Duffy; Kevin A. Hovel; Melissa R. Kardish; Pamela L. Reynolds; Christoffer Boström; Katharyn E. Boyer; Mathieu Cusson; Johan Eklöf; Aschwin H. Engelen; Britas Klemens Eriksson; F. Joel Fodrie; John N. Griffin; Clara M. Hereu; Masakazu Hori; A. Randall Hughes; Mikhail V. Ivanov; Pablo Jorgensen; Claudia Kruschel; Kun-Seop Lee; Jonathan Lefcheck; Karen McGlathery; Per-Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Nessa E. O'Connor; Jeanine L. Olsen; Robert J. Orth; Bradley J. Peterson; Henning Reiss; Francesca Rossi; Jennifer Ruesink; Erik E. Sotka; Jonas Thormar; Fiona Tomas; Richard Unsworth; Erin P. Voigt; Matthew A. Whalen; Shelby L. Ziegler; John J. Stachowicz
  Proceedings of the Royal Society B: Biological Sciences, 289, 1969, The Royal Society, 23 Feb. 2022
  Scientific journal, While considerable evidence exists of biogeographic patterns in the intensity of species interactions, the influence of these patterns on variation in community structure is less clear. Studying how the distributions of traits in communities vary along global gradients can inform how variation in interactions and other factors contribute to the process of community assembly. Using a model selection approach on measures of trait dispersion in crustaceans associated with eelgrass ( Zostera marina ) spanning 30° of latitude in two oceans, we found that dispersion strongly increased with increasing predation and decreasing latitude. Ocean and epiphyte load appeared as secondary predictors; Pacific communities were more overdispersed while Atlantic communities were more clustered, and increasing epiphytes were associated with increased clustering. By examining how species interactions and environmental filters influence community structure across biogeographic regions, we demonstrate how both latitudinal variation in species interactions and historical contingency shape these responses. Community trait distributions have implications for ecosystem stability and functioning, and integrating large-scale observations of environmental filters, species interactions and traits can help us predict how communities may respond to environmental change.
• Predicting Future Shifts in the Distribution of Tropicalization Indicator Fish that Affect Coastal Ecosystem Services of Japan
  Kenji Sudo; Serina Maehara; Masahiro Nakaoka; Masahiko Fujii
  Frontiers in Built Environment, 7, Frontiers Media SA, 05 Jan. 2022
  Scientific journal, Tropicalization characterized by an increase in marine species originating from the tropical waters affects human society in various ways. An increase in toxic harmful species negatively affects fisheries and leisure use, and an increase in herbivorous fish affects fisheries and carbon sink capacity by decreasing seagrass/seaweed beds. On the other hand, an increase in tropical reef fish attracts more tourism. This study aimed to predict future shifts in the distribution of functional groups of tropicalization indicator fish that can affect marine ecosystem services in temperate coastal waters of Japan. We estimated the distribution of harmful fish Aluterus scriptus and Scarus ovifrons, herbivorous fish Kyphosus bigibbus and Siganus fuscescens, and tropical reef fish Amphiprion frenatus and Chaetodon auriga by collecting their distribution data from open databases. Distributions in 2000–2018 and the future (2046–2055 and 2091–2100) under different climate change scenarios (the representative concentration pathways; RCPs) were estimated using a species distribution model. We used environmental variables such as minimum sea surface temperature (SST), depth, slope, coral reef area, and seagrass/seaweed bed area as predictors and carried out future predictions using the future ocean regional projection (FORP) dataset. The minimum SST was the factor most responsible for the estimated distribution patterns for all species. The depth, slope, and seagrass/seaweed bed were also important for some species. The estimated probability of occurrence was high along the Pacific coast, which was affected by the warm Kuroshio Current and Tsushima Current along the coast of the Sea of Japan. Projected shifts in distributions based on different RCP scenarios showed that these indicator species would significantly increase their distribution in the middle to northern parts of Japan (32–37°N). By the 2090s, their habitat range was estimated to increase to 1.2–1.9 times that of 2000-2018 with severe warming (RCP8.5). However, the target species habitat range would not change significantly with stringent mitigation (RCP2.6). Our results suggest that ambitious commitment to reducing CO₂ and other greenhouse gas emissions, such as following the Paris Agreement, will alleviate future tropicalization. Moreover, the fine resolution results can also be directly used for planning climate adaptation programs for local decision makers.
• Spatial variation in diatom abundance and composition in Biwase Bay and Hamanaka Bay (Eastern Hokkaido, Japan), with reference to environmental features.
  Hyojin Ahn; Miho Ito; Naoko Kouchi; Kentaro Watanabe; Hiroya Abe; Tomonori Isada; Masahiro Nakaoka
  PeerJ, 10, e13705, 2022, [International Magazine]
  English, Scientific journal, This study aims to examine the spatial variation of diatom abundance and composition along the nearshore areas of Biwase Bay and Hamanaka Bay, eastern Hokkaido. Terrestrial input via Kiritappu Wetland is expected to affect variation and composition differently depending on the position of the two bays. We conducted an oceanographic survey in June 2014 to measure seawater temperature, salinity, colored dissolved organic matter (CDOM) absorption, nutrient concentrations, and total and size-fractionated chlorophyll (Chl) a concentration at 11 stations of the shallowest (<5 m) parts of the bays. These were grouped into four areas (Areas 1 and 2 in Biwase Bay, and Areas 3 and 4 in Hamanaka Bay) based on the distance of the location from the wetland outlet (nearest in Area 1 to the farthest in Area 4). Diatoms are the major primary producers in the water column. Therefore, we also determined genus level cell abundance and diversity of diatoms to compare similarity among areas. Sea surface temperature was the lowest at Area 4, whereas sea surface salinity was the lowest at Area 1. The contribution of CDOM absorption, an indicator of wetland-influenced river discharge, and silica concentration was highest at Area 1. Total amount of nitrite and nitrate concentrations was the highest at Area 4. Total amount of Chl a concentration was also lowest in Area 1. Our size-fractionated Chl a results revealed that while the size composition of phytoplankton varied among areas, micro-sized (>10 µm) phytoplankton were predominant in Area 4. Finally, diatom composition at the genus level differed greatly among areas. Pennate diatoms were predominant in Areas 1 and 2, but centric diatoms dominated in Areas 3 and 4. Our results suggested great spatial variability in oceanographic conditions among areas, with less influence of wetland and more influence of Coastal Oyashio Water based on distance from the wetland outlet. Diatom composition showed geographical division between Biwase and Hamanaka Bays.
• Species level mapping of a seagrass bed using an unmanned aerial vehicle and deep learning technique.
  Satoru Tahara; Kenji Sudo; Takehisa Yamakita; Masahiro Nakaoka
  PeerJ, 10, e14017, 2022, [International Magazine]
  English, Scientific journal, Background: Seagrass beds are essential habitats in coastal ecosystems, providing valuable ecosystem services, but are threatened by various climate change and human activities. Seagrass monitoring by remote sensing have been conducted over past decades using satellite and aerial images, which have low resolution to analyze changes in the composition of different seagrass species in the meadows. Recently, unmanned aerial vehicles (UAVs) have allowed us to obtain much higher resolution images, which is promising in observing fine-scale changes in seagrass species composition. Furthermore, image processing techniques based on deep learning can be applied to the discrimination of seagrass species that were difficult based only on color variation. In this study, we conducted mapping of a multispecific seagrass bed in Saroma-ko Lagoon, Hokkaido, Japan, and compared the accuracy of the three discrimination methods of seagrass bed areas and species composition, i.e., pixel-based classification, object-based classification, and the application of deep neural network. Methods: We set five benthic classes, two seagrass species (Zostera marina and Z. japonica), brown and green macroalgae, and no vegetation for creating a benthic cover map. High-resolution images by UAV photography enabled us to produce a map at fine scales (<1 cm resolution). Results: The application of a deep neural network successfully classified the two seagrass species. The accuracy of seagrass bed classification was the highest (82%) when the deep neural network was applied. Conclusion: Our results highlighted that a combination of UAV mapping and deep learning could help monitor the spatial extent of seagrass beds and classify their species composition at very fine scales.
• Quantifying the dynamics of rocky intertidal sessile communities along the Pacific coast of Japan: implications for ecological resilience
  Ken Ishida; Michikusa Tachibana; Masakazu Hori; Takehiro Okuda; Tomoko Yamamoto; Masahiro Nakaoka; Takashi Noda
  Scientific Reports, 11, 1, Springer Science and Business Media LLC, Dec. 2021, [International Magazine]
  Scientific journal, Long-term patterns in trajectories of natural communities provide insights into ecological resilience, but their assessment requires long-term census data. We analyzed 16-year census data for intertidal communities from 30 rocky shores along Japan’s Pacific coast to assign community change to four possible trajectories (stable, reversible, abrupt, or linear) representing different aspects of ecological resilience, and to estimate multiple metrics of temporal invariability (species richness, species composition, and community abundance). We examined (1) how the prevalence of the four trajectories differs among regions, (2) how the features (model coefficients) of each trajectory vary among regions, and (3) how the temporal invariabilities differ among trajectories and regions. We found that the stable trajectory was the most common. Its features differed among regions, with a faster recovery to steady-state equilibrium in low-latitude regions. Furthermore, trajectories and temporal invariabilities both varied among regions, seemingly in association with the strength of ocean current fluctuations. Thus, the relationship between community temporal invariability and trajectory may be weak or absent, at least at the regional scale.
• Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows
  Tomonori Isada; Hiroya Abe; Hiromi Kasai; Masahiro Nakaoka
  Frontiers in Marine Science, 8, Frontiers Media SA, 11 Oct. 2021, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal, Coastal oceans interacting with terrestrial ecosystems play an important role in biogeochemical cycles. It is therefore essential to research land–ocean interactions for further understanding of the processes influencing nutrients dynamics in coastal areas. We investigated the seasonal and spatial distribution of nutrient concentrations and light absorption coefficients of colored dissolved organic matter (CDOM), non-algal particles (NAP), and phytoplankton in a wetland-influenced river–eelgrass meadows–coastal waters continuum in the protected and semi-enclosed coastal sea of Akkeshi-ko estuary (AKE) and Akkeshi Bay (AB), Japan from April 2014 to February 2015. The mixing dilution lines of the CDOM absorption coefficient at 355 nm [a_CDOM(355)] relative to salinity predicted by two end-members between freshwater and coastal water showed conservative mixing in AB. Silicate concentrations were significantly correlated with salinity and a_CDOM(355) in AB in each month except for December 2014. These results suggest that silicate and CDOM in AB primarily originates from wetland-influenced river discharge. However, samples collected from the eelgrass meadows of AKE, where mariculture is developed, showed non-conservative mixing of silicate concentrations and a_CDOM(355) with salinity except for June 2014. Elevated phosphate concentrations, probably released from sediments, were also found in the eelgrass meadows of AKE, especially during summer. These results suggest that the metabolic activities of mariculture and seagrass ecosystem significantly contribute to the nutrient cycles and CDOM absorption in AKE and to the distinct water-mass systems inside and outside AKE. The relative absorption properties of NAP [a_NAP(443)], phytoplankton [a_ph(443)], and a_CDOM(443) showed that CDOM is the main factor affecting the light distribution in AKE. However, the relative absorption properties varied seasonally in AB because of spring and autumn phytoplankton blooms and ice cover during winter. Significant relationships were observed between the Secchi disk depth (Z_SD), a_NAP(443), and a_CDOM(443). Chl a concentration and a_ph(443) were not good indicators for predicting Z_SD in our study region. These results suggest that incorporating inherent optical properties and CDOM from mariculture and seagrass ecosystem into ecosystem models could improve predictions of light distribution along the freshwater–eelgrass–coastal waters continuum in optically complex coastal waters.
• Large-scale comparison of biomass and reproductive phenology among native and non-native populations of the seagrass Zostera japonica
  MA Ito; HJ Lin; MI O’Connor; M Nakaoka
  Marine Ecology Progress Series, 675, 1, 21, Inter-Research Science Center, 30 Sep. 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  Scientific journal, Large-scale analysis along latitude or temperature gradients can be an effective method for exploring the potential roles of light and temperature in controlling seagrass phenology. In this study, we investigated effects of latitude and temperature on seagrass biomass and reproductive seasonality. Zostera japonica is an intertidal seagrass with a wide latitudinal distribution expanding from tropical to temperate zones in its native range in Asia, with an additional non-native distribution in North America. We collated available data on phenological traits (timings of peak biomass or reproduction, durations of biomass growth and reproductive season, and maximum biomass or reproductive ratio) from publications and our own observations. Traits were compared among geographic groups: Asia-tropical, Asia-temperate, and North America-temperate. We further examined relationships between traits and latitude and temperature for 3 population groups: Asian, North American, and all populations. Our analysis revealed significant variation among geographic groups in maximum biomass, peak reproductive timing, and maximum reproductive ratio, but not in other traits. Maximum biomass and peak reproductive timing for Asian and all populations were significantly correlated with latitude and temperature. Maximum biomass was highest at mid-latitudes or intermediate temperatures and decreased toward distribution range limits, and peak reproductive timing occurred later in the year at higher latitudes or cooler sites. North American populations showed shorter growth durations and greater reproductive ratios at higher latitude. Different responses observed for North American populations may reflect effects of introduction. Our study demonstrates potential variation among geographic regions and between native and non-native populations.
• Multiple stressors and recruitment failure of long-lived endangered freshwater mussels with a complex life cycle
  Kazuki Miura; Nobuo Ishiyama; Junjiro N. Negishi; Daisetsu Ito; Keita Kawajiri; Hokuto Izumi; Takahiro Inoue; Masahiro Nakaoka; Futoshi Nakamura
  Cold Spring Harbor Laboratory, 23 Sep. 2021
  Multiple stressors can interactively affect the population of organisms; however, the process by which they affect recruitment efficiency remains unclear for empirical populations. Recruitment efficiency can be regulated at multiple stages of life, particularly in organisms with complex life cycles. Understanding the interactive effects of multiple stressors on recruitment efficiency and determining the bottleneck life stages is imperative for species conservation.
  
  The proportion of <20-year-old juveniles of the endangered freshwater pearl mussel Margaritifera togakushiensis, which has an obligate parasitic larval stage, was investigated in 24 rivers from eastern Hokkaido, northern Japan to reveal the influence of nutrients, fine sediment, and their combined effects on juvenile recruitment efficiency. The following indices for recruitment at adult, parasitic, and post-parasitic juvenile stages were obtained from 11 of these rivers: gravid female density, glochidia density (the number of glochidia infections per stream area), and juvenile survival rate. This study explored the bottleneck stages of recruitment efficiency and the interactive effects of the two stressors on these stages.
  
  Twenty-four population status assessments determined that the proportion of juveniles ranged from 0.00 to 0.53, and juveniles were absent from four rivers. The results showed that the parasitic and post-parasitic juvenile stages were bottlenecks for recruitment efficiency. Juvenile survival rates had a more significant positive effect on recruitment efficiency in rivers with a high glochidia density. Juvenile survival rate was decreased by the synergistic interaction of nutrients and fine sediment, although factors limiting glochidia density were not found.
  
  The nutrient concentration of rivers in the study region was well explained by the proportion of agricultural land cover and urban areas in the watersheds, but no relationship was detected between fine sediment abundance and land use.
  
  This study suggests that nutrient management at a catchment scale can be effective for re-establishing the recruitment of M. togakushiensis, particularly in rivers with a high content of fine sediments. The results also emphasise the importance of considering both parasitic and post-parasitic juvenile stages of mussels to maximise the positive effects of stressor mitigation.
  
  
• Blue Carbon Ecosystem Services Through a Vulnerability Lens: Opportunities to Reduce Social Vulnerability in Fishing Communities
  T. E. Angela L. Quiros; Kenji Sudo; Reynante V. Ramilo; Helbert G. Garay; Muammar Princess G. Soniega; Alvin Baloloy; Ariel Blanco; Ayin Tamondong; Kazuo Nadaoka; Masahiro Nakaoka
  Frontiers in Marine Science, 8, Frontiers Media SA, 03 Aug. 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  Scientific journal, Ecosystem services (ES) are benefits nature provides to humans; these services change in space and time and are largely dependent on context. Coastal habitat that provides key ES are blue carbon ecosystems, namely seagrass and mangroves. One important ES they provide is the provisioning of seafood, which benefits coastal populations with livelihoods and food security. We employed a social-ecological approach that draws from the vulnerability literature for social, ecological, and economic criteria to map ES provision in ten communities on Busuanga Island, Palawan Province, Philippines. We assess the spatial dynamics of ES provision for small-scale fisheries in seagrass and mangroves, in relation to local beneficiaries. Using a mixed-methods approach with ecological assessments of seagrass beds, spatial analysis, landing surveys, household and key informant interviews, we overlaid biophysical variables on social data, mapping sensitivities and adaptive capacities to compare communities’ social vulnerabilities. Spatial analysis revealed healthy blue carbon ecosystems in ten local communities (barangays) as measured by proportion of coastline covered, low patchiness and high continuity along the coastline, and the presence of adjacent habitat. We found seagrass ecosystems were more vulnerable than mangroves. Rural barangays had less exposure and lower sensitivity to blue carbon ecosystem loss than urban barangays. Blue carbon ecosystem fisheries are highly sensitive fisheries, due to their catch composition and low catch per unit effort, with mangrove fisheries having a slightly lower sensitivity than seagrass fisheries due to greater catch per unit effort. Diversified livelihoods and the presence of NGOs and People’s Organizations (POs) increased adaptive capacity and reduced overall vulnerability. We aim to highlight a coastal human community’s relationship with blue carbon ecosystems using context-specific vulnerability criteria. Our site-specific social vulnerability assessment may be adapted for use in other coastal communities within the coral triangle. This work suggests opportunities for conservation interventions to manage local communities’ sensitivities and adaptive capacity around the use of blue carbon ecosystems.
• Distribution, Temporal Change, and Conservation Status of Tropical Seagrass Beds in Southeast Asia: 2000–2020
  Kenji Sudo; T. E. Angela L. Quiros; Anchana Prathep; Cao Van Luong; Hsing-Juh Lin; Japar Sidik Bujang; Jillian Lean Sim Ooi; Miguel D. Fortes; Muta Harah Zakaria; Siti Maryam Yaakub; Yi Mei Tan; Xiaoping Huang; Masahiro Nakaoka
  Frontiers in Marine Science, 8, Frontiers Media SA, 08 Jul. 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  Scientific journal, Although Southeast Asia is a hotspot of global seagrass diversity, there are considerable information gaps in the distribution of seagrass beds. Broad-scale seagrass distribution has not been updated in the global seagrass database by UNEP-WCMC since 2000, although studies on seagrasses have been undertaken intensively in each region. Here we analyze the recent distribution of tropical seagrass beds, their temporal changes, causes of decline and conservation status in Southeast Asia (plus southern mainland China, Taiwan and Ryukyu Island of Japan) using data collected after 2000. Based on the 195 literature published since 2000, we identified 1,259 point data and 1,461 polygon data showing the distribution of seagrass beds. A large discrepancy was found in the seagrass bed distribution between our updated data and the UNEP-WCMC database, mostly due to inaccurate and low resolution location information in the latter. Temporal changes in seagrass bed area analyzed for 68 sites in nine countries/regions demonstrated that more than 60% of seagrass beds declined at an average rate of 10.9% year^–1, whereas 20% of beds increased at an average rate of 8.1% year^–1, leading to an overall average decline of 4.7% year^–1. Various types of human-induced threats were reported as causes for the decline, including coastal development, fisheries/aquaculture, and natural factors such as typhoons and tsunamis. The percentage of seagrass beds covered with existing marine protected areas (MPAs) varied greatly among countries/regions, from less than 1% in Brunei Darussalam and Singapore to 100% in southern Japan. However, the degree of conservation regulation was not sufficient even in regions with higher MPA coverage. The percentage of seagrass beds within EBSAs (Ecologically and Biologically Significant Area determined by the Convention of Biological Diversity) was higher than that within MPAs because EBSAs cover a greater area than MPAs. Therefore, designating EBSAs as legally effective MPAs can greatly improve the conservation status of seagrass beds in Southeast Asia.
• Consideration of Regional Future Scenarios Based on Analysis of Residents' Consciousnesses about Social and Environmental Changes : In the case of Akkeshi, Hokkaido
  但馬英知; 法理樹里; 小林由美; 牧野光琢; 仲岡雅裕
  沿岸域学会誌, 34, 1, 37, 46, 日本沿岸域学会, Jun. 2021, [Peer-reviewed], [Last author], [Domestic magazines]
  Japanese
• Marine Life 2030: Forecasting changes to ocean biodiversity to inform decision-making: A critical role for the marine biodiversity observation network (MBON)
  Frank Muller-Karger; Maria Kavanaugh; Katrin Iken; Enrique Montes; Francisco Chavez; Henry Ruhl; Robert Miller; Jeffrey Runge; Jackie Grebmeier; Lee Cooper; Brian Helmuth; Elva Escobar-Briones; Neil Hammerschlag; Maury Estes; Jay Pearlman; Erin Hestir; Emmett Duffy; Kristen J. Sarri; Charlotte Hudson; Jason Landrum; Gabrielle Canonico; Libby Jewett; Jan Newton; Barbara Kirkpatrick; Clarissa Anderson; Amanda Bates; Isabel Sousa-Pinto; Masahiro Nakaoka; Joana Soares
  Marine Technology Society Journal, 55, 3, 84, 85, Marine Technology Society Inc., 01 May 2021
  English, Scientific journal
• Joint effects of patch edges and habitat degradation on faunal predation risk in a widespread marine foundation species
  Kevin A. Hovel; J. Emmett Duffy; John J. Stachowicz; Pamela Reynolds; Christoffer Boström; Katharyn E. Boyer; Stéphanie Cimon; Mathieu Cusson; Fredrick Joel Fodrie; Karine Gagnon; Clara M. Hereu; Masakazu Hori; Pablo Jorgensen; Claudia Kruschel; Kun‐Seop Lee; Masahiro Nakaoka; Nessa E. O’Connor; Francesca Rossi; Jennifer Ruesink; Fiona Tomas; Shelby Ziegler
  Ecology, 102, 5, Wiley, May 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Diel vertical movements and feeding behaviour of blue humphead parrotfish Scarus ovifrons in a temperate reef of Japan
  Kazuma Gomi; Yohei Nakamura; Masaru Kanda; Kentaro Honda; Masahiro Nakaoka; Chiho Honma; Masao Adachi
  Journal of Fish Biology, Wiley, 07 Mar. 2021, [Peer-reviewed], [International Magazine]
  English, Scientific journal, The feeding ecology of scarinine parrotfishes on tropical coral reefs has received considerable attention in the past few decades; however, relatively few studies have been conducted in high-latitude reefs. Among the Indo-Pacific Scarus species, Scarus ovifrons is unique, being largely restricted to the warm temperate waters of Japan. However, there is very little information available on the feeding ecology of this species. In this study, we used acoustic telemetry to detect the diel vertical movement patterns of S. ovifrons, video survey to detect its feeding depths and substrata and focal follow survey and genetic analysis to identify algae composition on the feeding scars at Kashiwajima Island, southwestern Japan (32°46'N, 132°38'E). Acoustic telemetry revealed that S. ovifrons spent most of its time in shallow water (<10 m) during the day and slept in deeper water (10-15 m) at night. Video and focal follow surveys revealed that most fishes of various sizes regularly took bites on epilithic algae and detrital materials on rocky substrata at depths of <10 m, but large fishes (>40 cm total length) sometimes took bites directly on live corals (Acropora solitaryensis) at the 5 m depth zone where live tabular corals dominated the benthos. Molecular phylogenetic analyses revealed that epilithic algae collected from feeding scars were mainly composed of Rhodophyta, and coralline algae were less often targeted. Overall, this study revealed that S. ovifrons feeds mostly at depths <10 m and the feeding algae substrata of the species are similar to those of tropical coral reef parrotfishes. This article is protected by copyright. All rights reserved.
• The Asia‐Pacific Biodiversity Observation Network: 10‐year achievements and new strategies to 2030
  Yayoi Takeuchi; Hiroyuki Muraoka; Takehisa Yamakita; Yuichi Kano; Shin Nagai; Touch Bunthang; Mark John Costello; Dedy Darnaedi; Bibian Diway; Tonny Ganyai; Chaiwut Grudpan; Alice Hughes; Reiichiro Ishii; Po Teen Lim; Keping Ma; Aidy M. Muslim; Shin‐ichi Nakano; Masahiro Nakaoka; Tohru Nakashizuka; Manabu Onuma; Chan‐Ho Park; Runi Sylvester Pungga; Yusuke Saito; Mangal Man Shakya; Mohd Khairulazman Sulaiman; Maya Sumi; Phanara Thach; Yongyut Trisurat; Xuehong Xu; Hiroya Yamano; Tze Leong Yao; Eun‐Shik Kim; Sheila Vergara; Tetsukazu Yahara
  Ecological Research, 36, 2, 232, 257, Mar. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Trophic transfer of microplastics from mysids to fish greatly exceeds direct ingestion from the water column
  Takaaki Hasegawa; Masahiro Nakaoka
  Environmental Pollution, 273, 116468, 116468, Elsevier BV, Mar. 2021, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal
• Modeling seagrass bed dynamics under environmental impacts of intensive mariculture activities in Bolinao and Anda, the Philippines
  Masaya Yoshikai; Takashi Nakamura; Yoshiyuki Tanaka; Masahiro Nakaoka; Atsushi Watanabe; Eugene C. Herrera; Takumi Tsuchiya; Toshihiro Miyajima; Maria Lourdes San Diego-McGlone; Miguel D. Fortes; Ariel C. Blanco; Ayin M. Tamondong; Kazuo Nadaoka
  Estuarine, Coastal and Shelf Science, 250, 107152, 107152, Elsevier BV, Mar. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Influences of size structure and post-bloom supply of phytoplankton on body size variations in a common Pacific Arctic bivalve (Macoma calcarea)
  Hisatomo Waga; Toru Hirawake; Masahiro Nakaoka
  Polar Science, 27, 100554, 100554, Mar. 2021, [Peer-reviewed], [Last author], [International Magazine]
  English, Scientific journal
• The role of host promiscuity in the invasion process of a seaweed holobiont
  Guido Bonthond; Till Bayer; Stacy A. Krueger-Hadfield; Nadja Stärck; Gaoge Wang; Masahiro Nakaoka; Sven Künzel; Florian Weinberger
  The ISME Journal, Springer Science and Business Media LLC, 21 Jan. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal, Invasive species are co-introduced with microbiota from their native range and also interact with microbiota found in the novel environment to which they are introduced. Host flexibility toward microbiota, or host promiscuity, is an important trait underlying terrestrial plant invasions. To test whether host promiscuity may be important in macroalgal invasions, we experimentally simulated an invasion in a common garden setting, using the widespread invasive macroalga Agarophyton vermiculophyllum as a model invasive seaweed holobiont. After disturbing the microbiota of individuals from native and non-native populations with antibiotics, we monitored the microbial succession trajectories in the presence of a new source of microbes. Microbial communities were strongly impacted by the treatment and changed compositionally and in terms of diversity but recovered functionally by the end of the experiment in most respects. Beta-diversity in disturbed holobionts strongly decreased, indicating that different populations configure more similar –or more common– microbial communities when exposed to the same conditions. This decline in beta-diversity occurred not only more rapidly, but was also more pronounced in non-native populations, while individuals from native populations retained communities more similar to those observed in the field. This study demonstrates that microbial communities of non-native A. vermiculophyllum are more flexibly adjusted to the environment and suggests that an intraspecific increase in host promiscuity has promoted the invasion process of A. vermiculophyllum. This phenomenon may be important among invasive macroalgal holobionts in general.
• Can we locate shrimp aquaculture areas from space? – A case study for Thailand
  Dorber, M.; Verones, F.; Nakaoka, M.; Sudo, K.
  Remote Sensing Applications: Society and Environment, 20, 100416, 100416, Elsevier BV, Nov. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Fine-scale distribution of tropical seagrass beds in Southeast Asia
  Sudo, K.; Nakaoka, M.
  Ecological Research, 35, 6, 994, 1000, Wiley, Nov. 2020, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal
• Scenario Analysis of Renewable Energy–Biodiversity Nexuses Using a Forest Landscape Model
  Chihiro Haga; Marimi Maeda; Wataru Hotta; Takahiro Inoue; Takanori Matsui; Takashi Machimura; Masahiro Nakaoka; Junko Morimoto; Hideaki Shibata; Shizuka Hashimoto; Osamu Saito
  Frontiers in Ecology and Evolution, 8, 27 May 2020, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• How do microbiota associated with an invasive seaweed vary across scales?
  Bonthond, G.; Bayer, T.; Krueger-Hadfield, S.A.; Barboza, F.R.; Nakaoka, M.; Valero, M.; Wang, G.; K{\"u}nzel, S.; Weinberger, F.
  Molecular Ecology, 29, 11, 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• The gut retention time of microplastics in barnacle naupliar larvae from different climatic zones and marine habitats
  Yu, S.-P.; Nakaoka, M.; Chan, B.K.K.
  Environmental Pollution, 268, 115865, 115865, Elsevier BV, 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• The effect of environmental gradient on biodiversity and similarity of invertebrate communities in eelgrass (Zostera marina) beds
  Namba, M.; Hashimoto, M.; Ito, M.; Momota, K.; Smith, C.; Yorisue, T.; Nakaoka, M.
  Ecological Research, 35, 1, 61, 75, Wiley, Jan. 2020, [Peer-reviewed], [Corresponding author], [International Magazine]
  English, Scientific journal
• Predictions of kelp distribution shifts along the northern coast of Japan
  Masahiro Nakaoka
  Ecological Research, 35, 1, 47, 60, 28 Oct. 2019, [Peer-reviewed], [Last author], [International Magazine]
  English, Scientific journal
• Toward more rapid and efficient peer review: A case study on publication in Ecological Research
  Yutaka Okuzaki; Shoko Nakamura; Masahiro Nakaoka
  Ecological Research, 34, 5, 563, 574, Sep. 2019, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal
• ILTER – The International Long-Term Ecological Research Network as a Platform for Global Coastal and Ocean Observation
  José H. Muelbert; Nicholas J. Nidzieko; Alicia T. R. Acosta; Stace E. Beaulieu; Angelo F. Bernardino; Elmira Boikova; Thomas G. Bornman; Bruno Cataletto; Klaas Deneudt; Erika Eliason; Alexandra Kraberg; Masahiro Nakaoka; Alessandra Pugnetti; Olivier Ragueneau; Mirco Scharfe; Thomas Soltwedel; Heidi M. Sosik; Angela Stanisci; Kremena Stefanova; Pierre Stéphan; Adrian Stier; Johan Wikner; Adriana Zingone
  Frontiers in Marine Science, 6, 28 Aug. 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Application of deep learning techniques for determining the spatial extent and classification of seagrass beds, Trang, Thailand
  Takehisa Yamakita; Fumiaki Sodeyama; Napakhwan Whanpetch; Kentaro Watanabe; Masahiro Nakaoka
  Botanica Marina, 62, 4, 291, 307, 27 Aug. 2019, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Toward a Coordinated Global Observing System for Seagrasses and Marine Macroalgae
  J. Emmett Duffy; Lisandro Benedetti-Cecchi; Joaquin Trinanes; Frank E. Muller-Karger; Rohani Ambo-Rappe; Christoffer Boström; Alejandro H. Buschmann; Jarrett Byrnes; Robert G. Coles; Joel Creed; Leanne C. Cullen-Unsworth; Guillermo Diaz-Pulido; Carlos M. Duarte; Graham J. Edgar; Miguel Fortes; Gustavo Goni; Chuanmin Hu; Xiaoping Huang; Catriona L. Hurd; Craig Johnson; Brenda Konar; Dorte Krause-Jensen; Kira Krumhansl; Peter Macreadie; Helene Marsh; Len J. McKenzie; Nova Mieszkowska; Patricia Miloslavich; Enrique Montes; Masahiro Nakaoka; Kjell Magnus Norderhaug; Lina M. Norlund; Robert J. Orth; Anchana Prathep; Nathan F. Putman; Jimena Samper-Villarreal; Ester A. Serrao; Frederick Short; Isabel Sousa Pinto; Peter Steinberg; Rick Stuart-Smith; Richard K. F. Unsworth; Mike van Keulen; Brigitta I. van Tussenbroek; Mengqiu Wang; Michelle Waycott; Lauren V. Weatherdon; Thomas Wernberg; Siti Maryam Yaakub
  Frontiers in Marine Science, 6, Frontiers Media SA, 04 Jul. 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Temperature and salinity survival limits of the fluffy sea anemone, Metridium senile (L.), in Japan
  Heather Glon; Yamaguchi Haruka; Marymegan Daly; Masahiro Nakaoka
  Hydrobiologia, 830, 1, 303, 315, Springer Science and Business Media LLC, Mar. 2019, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Blue Carbon Storage Capacity of Temperate Eelgrass (Zostera marina) Meadows
  Maria Emilia Röhr; Marianne Holmer; Julia K. Baum; Mats Björk; Katharyn Boyer; Diana Chin; Lia Chalifour; Stephanie Cimon; Mathieu Cusson; Martin Dahl; Diana Deyanova; J. Emmet Duffy; Johan S. Eklöf; Julie K. Geyer; John N. Griffin; Martin Gullström; Clara M. Hereu; Masakazu Hori; Kevin A. Hovel; A. Randall Hughes; Pablo Jorgensen; Stephanie Kiriakopolos; Per-Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Bradley Peterson; Katrin Reiss; Pamela L. Reynolds; Francesca Rossi; Jennifer Ruesink; Rui Santos; John J. Stachowicz; Fiona Tomas; Kun-Seop Lee; Richard K. F. Unsworth; Christoffer Boström
  Global Biogeochemical Cycles, 32, 10, 1457, 1475, American Geophysical Union (AGU), Oct. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Seagrass ecosystem services – What's next?
  Lina Mtwana Nordlund; Emma L. Jackson; Masahiro Nakaoka; Jimena Samper-Villarreal; Pedro Beca-Carretero; Joel C. Creed
  Marine Pollution Bulletin, 134, 145, 151, Elsevier BV, Sep. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Material cycling in coastal waters and the role of the Kiritappu Wetland in Hamanaka, Hokkaido: An analysis using the surf clam (Pseudocardium sachalinense) as an environmental indicator
  X. Ba; N. Kouchi; K. Watanabe; M. Nakaoka; M. Fujii
  Marine Chemistry, 205, 81, 89, Elsevier BV, Sep. 2018, [Peer-reviewed], [International Magazine]
  Scientific journal
• Spatial patterns and predictor variables vary among different types of primary producers and consumers in eelgrass (Zostera marina) beds
  Mizuho Namba; Masahiro Nakaoka
  PLOS ONE, 13, 8, e0201791, e0201791, Public Library of Science (PLoS), 07 Aug. 2018, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal
• Seasonal change in spatial variability of eelgrass epifaunal community in relation to gradients of abiotic and biotic factors
  Kyosuke Momota; Masahiro Nakaoka
  Marine Ecology, 39, 4, Wiley, Aug. 2018, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal
• Combining niche shift and population genetic analyses predicts rapid phenotypic evolution during invasion
  Erik E. Sotka; Aaron W. Baumgardner; Paige M. Bippus; Christophe Destombe; Elizabeth A. Duermit; Hikaru Endo; Ben A. Flanagan; Mits Kamiya; Lauren E. Lees; Courtney J. Murren; Masahiro Nakaoka; Sarah J. Shainker; Allan E. Strand; Ryuta Terada; Myriam Valero; Florian Weinberger; Stacy A. Krueger‐Hadfield
  Evolutionary Applications, 11, 5, 781, 793, Wiley, Jun. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Oyster aquaculture impacts Zostera marina epibiont community composition in Akkeshi-ko estuary, Japan
  Carter S. Smith; Minako Ito; Mizuho Namba; Masahiro Nakaoka
  PLOS ONE, 13, 5, e0197753, e0197753, Public Library of Science (PLoS), 24 May 2018, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Form-function relationships in a marine foundation species depend on scale: a shoot to global perspective from a distributed ecological experiment
  Jennifer L. Ruesink; John J. Stachowicz; Pamela L. Reynolds; Christoffer Boström; Mathieu Cusson; James Douglass; Johan Eklöf; Aschwin H. Engelen; Masakazu Hori; Kevin Hovel; Katrin Iken; Per-Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Jeanine L. Olsen; Erik E. Sotka; Matthew A. Whalen; J. Emmett Duffy
  Oikos, 127, 3, 364, 374, Wiley, Mar. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Broad scale variation in seagrass benthic macrofaunal assemblages along the coast of Japan
  Venus Leopardas; Masakazu Hori; Hiroshi Mukai; Yoshiyuki Tanaka; Ken-ichi Yokoi; Misuzu Aoki; Naoto Sato; Napakhwan Whanpetch; Masahiro Nakaoka
  Ecological Research, 33, 1, 105, 117, Wiley, Jan. 2018, [Peer-reviewed], [Last author], [International Magazine]
  Scientific journal
• TSUNAGARI: a new interdisciplinary and transdisciplinary study toward conservation and sustainable use of biodiversity and ecosystem services
  Masahiro Nakaoka; Kenji Sudo; Mizuho Namba; Hideaki Shibata; Futoshi Nakamura; Satoshi Ishikawa; Mitsutaku Makino; Hiroya Yamano; Shin-ichiro S. Matsuzaki; Takehisa Yamakita; Xiubo Yu; Xiyong Hou; Xiaowei Li; Jon Brodie; Keiichiro Kanemoto; Dan Moran; Francesca Verones
  Ecological Research, 33, 1, 35, 49, Jan. 2018, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Latitude, temperature, and habitat complexity predict predation pressure in eelgrass beds across the Northern Hemisphere
  Pamela L. Reynolds; John J. Stachowicz; Kevin Hovel; Christoffer Boström; Katharyn Boyer; Mathieu Cusson; Johan S. Eklöf; Friederike G. Engel; Aschwin H. Engelen; Britas Klemens Eriksson; F. Joel Fodrie; John N. Griffin; Clara M. Hereu; Masakazu Hori; Torrance C. Hanley; Mikhail Ivanov; Pablo Jorgensen; Claudia Kruschel; Kun‐Seop Lee; Karen McGlathery; Per‐Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Nessa E. O'Connor; Robert J. Orth; Francesca Rossi; Jennifer Ruesink; Erik E. Sotka; Jonas Thormar; Fiona Tomas; Richard K. F. Unsworth; Matthew A. Whalen; J. Emmett Duffy
  Ecology, 99, 1, 29, 35, Wiley, Jan. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Ecological connectivity between land and sea: a review
  Xiaodong Fang; Xiyong Hou; Xiaowei Li; Wan Hou; Masahiro Nakaoka; Xiubo Yu
  Ecological Research, 33, 1, 51, 61, Wiley, Jan. 2018, ［Internationally co-authored］, [International Magazine]
  Scientific journal
• Growth performance and structure of a mangrove afforestation project on a former seagrass bed, Mindanao Island, Philippines
  Sahadev Sharma; Kazuo Nadaoka; Masahiro Nakaoka; Wilfredo H. Uy; Richard A. MacKenzie; Daniel A. Friess; Miguel D. Fortes
  HYDROBIOLOGIA, 803, 1, 359, 371, Nov. 2017, [Peer-reviewed]
  English, Scientific journal
• Marine protected area restricts demographic connectivity: Dissimilarity in a marine environment can function as a biological barrier
  Masaaki Sato; Kentaro Honda; Wilfredo H. Uy; Darwin I. Baslot; Tom G. Genovia; Yohei Nakamura; Lawrence Patrick C. Bernardo; Hiroyuki Kurokochi; Allyn Duvin S. Pantallano; Chunlan Lian; Kazuo Nadaoka; Masahiro Nakaoka
  ECOLOGY AND EVOLUTION, 7, 19, 7859, 7871, Oct. 2017, [Peer-reviewed]
  English, Scientific journal
• In situ common garden assays demonstrate increased defense against natural fouling in non-native populations of the red seaweed Gracilaria vermiculophylla
  Shasha Wang; Florian Weinberger; Luyang Xiao; Masahiro Nakaoka; Gaoge Wang; Stacy A. Krueger-Hadfield; Erik E. Sotka; Dapeng Bian; Mark Lenz
  MARINE BIOLOGY, 164, 10, Oct. 2017, [Peer-reviewed]
  English, Scientific journal
• Importance of outer reef slopes for commercially important fishes: implications for designing a marine protected area in the Philippines
  Kentaro Honda; Wilfredo H. Uy; Darwin I. Baslot; Allyn Duvin S. Pantallano; Masaaki Sato; Yohei Nakamura; Masahiro Nakaoka
  FISHERIES SCIENCE, 83, 4, 523, 535, Jul. 2017, [Peer-reviewed]
  English, Scientific journal
• A multistate dynamic site occupancy model for spatially aggregated sessile communities
  Keiichi Fukaya; J. Andrew Royle; Takehiro Okuda; Masahiro Nakaoka; Takashi Noda
  METHODS IN ECOLOGY AND EVOLUTION, 8, 6, 757, 767, Jun. 2017, [Peer-reviewed]
  English, Scientific journal
• VERIFICATION OF ECHOSOUNDER MEASUREMENTS OF THICKNESS AND SPATIAL DISTRIBUTION OF KELP FORESTS
  Huamei Shao; Kenji Minami; Hokuto Shirakawa; Takashi Maeda; Toshiaki Ohmura; Yoshikazu Fujikawa; Norishige Yotsukura; Masahiro Nakaoka; Kazushi Miyashita
  JOURNAL OF MARINE SCIENCE AND TECHNOLOGY-TAIWAN, 25, 3, 343, 351, Jun. 2017, [Peer-reviewed]
  English, Scientific journal
• Anti-epiphyte defences in the red seaweed Gracilaria vermiculophylla: non-native algae are better defended than their native conspecifics
  Shasha Wang; Gaoge Wang; Florian Weinberger; Dapeng Bian; Masahiro Nakaoka; Mark Lenz
  JOURNAL OF ECOLOGY, 105, 2, 445, 457, Mar. 2017, [Peer-reviewed]
  English, Scientific journal
• Offshore currents explain the discontinuity of a fish community in the seagrass bed along the Japanese archipelago
  Atsushi Fukuta; Yasuhiro Kamimura; Masakazu Hori; Masahiro Nakaoka; Tsutomu Noda; Yoh Yamashita; Tsuguo Otake; Jun Shoji
  FISHERIES OCEANOGRAPHY, 26, 1, 65, 68, Jan. 2017, [Peer-reviewed]
  English, Scientific journal
• Influence of different types of sessile epibionts on the community structure of mobile invertebrates in an eelgrass bed
  Kyosuke Momota; Masahiro Nakaoka
  PEERJ, 5, 1, e2952, Jan. 2017, [Peer-reviewed]
  English, Scientific journal
• Genetic differences among varieties of Saccharina japonica in northern Japan as determined by AFLP and SSR analyses
  Norishige Yotsukura; Takashi Maeda; Tsuyoshi Abe; Masahiro Nakaoka; Tadashi Kawai
  JOURNAL OF APPLIED PHYCOLOGY, 28, 5, 3043, 3055, Oct. 2016, [Peer-reviewed]
  English, Scientific journal
• Larval dispersal dampens population fluctuation and shapes the interspecific spatial distribution patterns of rocky intertidal gastropods
  Ryosuke Sahara; Keiichi Fukaya; Takehiro Okuda; Masakazu Hori; Tomoko Yamamoto; Masahiro Nakaoka; Takashi Noda
  ECOGRAPHY, 39, 5, 487, 495, May 2016, [Peer-reviewed]
  English, Scientific journal
• Variation in macrofaunal communities of sea grass beds along a pollution gradient in Bolinao, northwestern Philippines
  Venus Leopardas; Kentaro Honda; Gay Amabelle Go; Klenthon Bolisay; Allyn Duvin Pantallano; Wilfredo Uy; Miguel Fortes; Masahiro Nakaoka
  MARINE POLLUTION BULLETIN, 105, 1, 310, 318, Apr. 2016, [Peer-reviewed]
  English, Scientific journal
• Global analysis of seagrass restoration: the importance of large-scale planting
  Marieke M. van Katwijk; Anitra Thorhaug; Nuria Marba; Robert J. Orth; Carlos M. Duarte; Gary A. Kendrick; Inge H. J. Althuizen; Elena Balestri; Guillaume Bernard; Marion L. Cambridge; Alexandra Cunha; Cynthia Durance; Wim Giesen; Qiuying Han; Shinya Hosokawa; Wawan Kiswara; Teruhisa Komatsu; Claudio Lardicci; Kun-Seop Lee; Alexandre Meinesz; Masahiro Nakaoka; Katherine R. O'Brien; Erik I. Paling; Chris Pickerell; Aryan M. A. Ransijn; Jennifer J. Verduin
  JOURNAL OF APPLIED ECOLOGY, 53, 2, 567, 578, Apr. 2016, [Peer-reviewed]
  English, Scientific journal
• Changes in biodiversity and trade-offs among ecosystem services, stakeholders, and components of well-being: the contribution of the International Long-Term Ecological Research network (ILTER) to Programme on Ecosystem Change and Society (PECS)
  Manuel Maass; Patricia Balvanera; Patrick Bourgeron; Miguel Equihua; Jacques Baudry; Jan Dick; Martin Forsius; Lubos Halada; Kinga Krauze; Masahiro Nakaoka; Daniel E. Orenstein; Terry W. Parr; Charles L. Redman; Ricardo Rozzi; Margarida Santos-Reis; Anthony M. Swemmer; Angheluta Vadineanu
  ECOLOGY AND SOCIETY, 21, 3, 2016, [Peer-reviewed]
  English, Scientific journal
• Biodiversity mediates top-down control in eelgrass ecosystems: a global comparative-experimental approach
  J. Emmett Duffy; Pamela L. Reynolds; Christoffer Bostroem; James A. Coyer; Mathieu Cusson; Serena Donadi; James G. Douglass; Johan S. Ekloef; Aschwin H. Engelen; Britas Klemens Eriksson; Stein Fredriksen; Lars Gamfeldt; Camilla Gustafsson; Galice Hoarau; Masakazu Hori; Kevin Hovel; Katrin Iken; Jonathan S. Lefcheck; Per-Olav Moksnes; Masahiro Nakaoka; Mary I. O'Connor; Jeanine L. Olsen; J. Paul Richardson; Jennifer L. Ruesink; Erik E. Sotka; Jonas Thormar; Matthew A. Whalen; John J. Stachowicz
  ECOLOGY LETTERS, 18, 7, 696, 705, Jul. 2015, [Peer-reviewed]
  English, Scientific journal
• Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows
  Toshihiro Miyajima; Masakazu Hori; Masami Hamaguchi; Hiromori Shimabukuro; Hiroshi Adachi; Hiroya Yamano; Masahiro Nakaoka
  GLOBAL BIOGEOCHEMICAL CYCLES, 29, 4, 397, 415, Apr. 2015, [Peer-reviewed]
  English, Scientific journal
• Seed dispersal in the seagrass Zostera marina is mostly within the parent bed in a protected bay
  Shinya Hosokawa; Masahiro Nakaoka; Eiichi Miyoshi; Tomohiro Kuwae
  MARINE ECOLOGY PROGRESS SERIES, 523, 41, 56, Mar. 2015, [Peer-reviewed]
  English, Scientific journal
• Diet, growth, and abundance of two seagrass bed fishes along a pollution gradient caused by milkfish farming in Bolinao, northwestern Philippines
  Mikio Watai; Yohei Nakamura; Kentaro Honda; Klenthon O. Bolisay; Toshihiro Miyajima; Masahiro Nakaoka; Miguel D. Fortes
  FISHERIES SCIENCE, 81, 1, 43, 51, Jan. 2015, [Peer-reviewed]
  English, Scientific journal
• Identification of important marine areas around the Japanese Archipelago: Establishment of a protocol for evaluating a broad area using ecologically and biologically significant areas selection criteria
  Takehisa Yamakita; Hiroyuki Yamamoto; Masahiro Nakaoka; Hiroya Yamano; Katsunori Fujikura; Kiyotaka Hidaka; Yuichi Hirota; Tadafumi Ichikawa; Shigeho Kakehi; Takahiko Kameda; Satoshi Kitajimal; Kazuhiro Kogure; Teruhisa Komatsu; Naoki H. Kumagai; Hiroomi Miyamoto; Kazushi Miyashita; Haruyuki Morimoto; Ryota Nakajima; Shuhei Nishida; Kou Nishiuchi; Shingo Sakamoto; Masayoshi Sano; Kenji Sudo; Hiroya Sugisaki; Kazuaki Tadokoro; Katsuhiko Tanaka; Yoshie Jintsu-Uchifune; Kentaro Watanabe; Hiromi Watanabe; Yumiko Yara; Norishige Yotsukura; Yoshihisa Shirayama
  MARINE POLICY, 51, 136, 147, Jan. 2015, [Peer-reviewed]
  English, Scientific journal
• Diel habitat-use patterns of commercially important fishes in a marine protected area in the Philippines
  Kentaro Honda; Wilfredo H. Uy; Darwin I. Baslot; Allyn Duvin S. Pantallano; Yohei Nakamura; Masahiro Nakaoka
  AQUATIC BIOLOGY, 24, 3, 163, 174, 2015, [Peer-reviewed]
  English, Scientific journal
• The Kuroshio Current influences genetic diversity and population genetic structure of a tropical seagrass, Enhalus acoroides
  Yuichi Nakajima; Yu Matsuki; Chunlan Lian; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Kazuo Nadaoka
  MOLECULAR ECOLOGY, 23, 24, 6029, 6044, Dec. 2014, [Peer-reviewed]
  English, Scientific journal
• Environmental and spatial controls of macroinvertebrate functional assemblages in seagrass ecosystems along the Pacific coast of northern Japan
  Katsumasa Yamada; Yoshiyuki Tanaka; Takuya Era; Masahiro Nakaoka
  GLOBAL ECOLOGY AND CONSERVATION, 2, 47, 61, Dec. 2014, [Peer-reviewed]
  English, Scientific journal
• Effects of spatial structure of population size on the population dynamics of barnacles across their elevational range
  Keiichi Fukaya; Takehiro Okuda; Masahiro Nakaoka; Takashi Noda
  JOURNAL OF ANIMAL ECOLOGY, 83, 6, 1334, 1343, Nov. 2014, [Peer-reviewed]
  English, Scientific journal
• 17-year change in species composition of mixed seagrass beds around Santiago Island, Bolinao, the northwestern Philippines
  Yoshiyuki Tanaka; Gay Amabelle Go; Atsushi Watanabe; Toshihiro Miyajima; Masahiro Nakaoka; Wilfredo H. Uy; Kazuo Nadaoka; Shuichi Watanabe; Miguel D. Fortes
  MARINE POLLUTION BULLETIN, 88, 1-2, 81, 85, Nov. 2014, [Peer-reviewed]
  English, Scientific journal
• Fifteen novel microsatellite markers for two Amphiprion species (Amphiprion frenatus and Amphiprion perideraion) and cross-species amplification
  Masaaki Sato; Hiroyuki Kurokochi; Engkong Tan; Shuichi Asakawa; Kentaro Honda; Klenthon O. Bolisay; Yohei Nakamura; Chunlan Lian; Miguel D. Fortes; Masahiro Nakaoka
  CONSERVATION GENETICS RESOURCES, 6, 3, 685, 688, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• Early phase of the invasion of Balanus glandula along the coast of Eastern Hokkaido: changes in abundance, distribution, and recruitment
  A. K. M. Rashidul Alam; Tomoaki Hagino; Keiichi Fukaya; Takehiro Okuda; Masahiro Nakaoka; Takashi Noda
  BIOLOGICAL INVASIONS, 16, 8, 1699, 1708, Aug. 2014, [Peer-reviewed]
  English, Scientific journal
• Benthic macrofaunal assemblages in multispecific seagrass meadows of the southern Philippines: Variation among vegetation dominated by different seagrass species
  Venus Leopardas; Wilfredo Uy; Masahiro Nakaoka
  JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 457, 71, 80, Aug. 2014, [Peer-reviewed]
  English, Scientific journal
• Factors affecting the local abundance of two anemonefishes (Amphiprion frenatus and A-perideraion) around a semi-closed bay in Puerto Galera, the Philippines
  Masaaki Sato; Kentaro Honda; Klenthon O. Bolisay; Yohei Nakamura; Miguel D. Fortes; Masahiro Nakaoka
  HYDROBIOLOGIA, 733, 1, 63, 69, Jul. 2014, [Peer-reviewed]
  English, Scientific journal
• Development of novel microsatellite markers for Cymodocea rotundata Ehrenberg (Cymodoceaceae), a pioneer seagrass species widely distributed in the Indo-Pacific
  Dan M. Arriesgado; Yuichi Nakajima; Yu Matsuki; Chunlan Lian; Satoshi Nagai; Motoshige Yasuike; Yoji Nakamura; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Kazuo Nadaoka
  CONSERVATION GENETICS RESOURCES, 6, 1, 135, 138, Mar. 2014, [Peer-reviewed]
  English, Scientific journal
• Development of microsatellite markers in a tropical seagrass Syringodium isoetifolium (Cymodoceaceae)
  Yu Matsuki; Akiko Takahashi; Yuichi Nakajima; Chunlan Lian; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Kazuo Nadaoka
  CONSERVATION GENETICS RESOURCES, 5, 3, 715, 717, Sep. 2013, [Peer-reviewed]
  English, Scientific journal
• Development of 10 novel polymorphic microsatellite markers for the Indo-Pacific horned starfish, Protoreaster nodosus
  Yuichi Nakajima; Nina Yasuda; Yu Matsuki; Dan M. Arriesgado; Chunlan Lian; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Coralie Taquet; Suharsono; Satoshi Nagai; Kazuo Nadaoka
  MARINE GENOMICS, 11, 27, 29, Sep. 2013, [Peer-reviewed]
  English, Scientific journal
• Habitat Use by Fishes in Coral Reefs, Seagrass Beds and Mangrove Habitats in the Philippines
  Kentaro Honda; Yohei Nakamura; Masahiro Nakaoka; Wilfredo H. Uy; Miguel D. Fortes
  PLOS ONE, 8, 8, Aug. 2013, [Peer-reviewed]
  English, Scientific journal
• Variable processes that determine population growth and an invariant mean-variance relationship of intertidal barnacles
  Keiichi Fukaya; Takehiro Okuda; Masakazu Hori; Tomoko Yamamoto; Masahiro Nakaoka; Takashi Noda
  ECOSPHERE, 4, 4, art48, Apr. 2013, [Peer-reviewed]
  English, Scientific journal
• Effective DNA extraction method for fragment analysis using capillary sequencer of the kelp, Saccharina
  Takashi Maeda; Tadashi Kawai; Masahiro Nakaoka; Norishige Yotsukura
  JOURNAL OF APPLIED PHYCOLOGY, 25, 1, 337, 347, Feb. 2013, [Peer-reviewed]
  English, Scientific journal
• Development of microsatellite markers for Thalassia hemprichii (Hydrocharitaceae), a widely distributed seagrass in the Indo-Pacific
  Yu Matsuki; Yuichi Nakajima; Chunlan Lian; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Kazuo Nadaoka
  CONSERVATION GENETICS RESOURCES, 4, 4, 1007, 1010, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Development of novel microsatellite markers in a tropical seagrass, Enhalus acoroides
  Yuichi Nakajima; Yu Matsuki; Chunlan Lian; Miguel D. Fortes; Wilfredo H. Uy; Wilfredo L. Campos; Masahiro Nakaoka; Kazuo Nadaoka
  CONSERVATION GENETICS RESOURCES, 4, 2, 515, 517, Jun. 2012, [Peer-reviewed]
  English, Scientific journal
• Genetic diversity and gene flow of East Asian seagrass, Zostera caespitosa Miki (Zosteraceae), in northeast Japan
  Tanaka, N; Nakaoka, M; Omori, Y; Aioi, K
  Bulletin of the National Museum of Nature and Science. Series B, 38, 29, 36, Mar. 2012, [Peer-reviewed], [Domestic magazines]
• Genetic differentiation of annual Zostera marina L. growing in Kagoshima Bay, Kagoshima, Japan based on an analysis using microsatellite markers
  SHIMABUKURO HIROMORI; HORI MASAKAZU; YOSHIMITSU SATOSHI; TOKUNAGA NARIMITSU; IGARI TADAMITSU; SASAKI KENSUKE; NAKAOKA MASAHIRO; KAWANE MASAKO; YOSHIDA GORO; HAMAGUCHI MASAMI
  NIPPON SUISAN GAKKAISHI, 78, 2, 204, 211, Japanese Society of Fisheries Science, 2012, [Peer-reviewed], [International Magazine]
  Scientific journal
• Seagrass response to mariculture-induced physico-chemical gradients in Bolinao, northwestern Philippines.
  Fortes, M. D; Go, G. A; Bolisay, K; Nakaoka, M; Uy; W. H; Lopez, M. R; Leopardas, V; Leriorato, J; Allyn Pantallano, A; Paciencia Jr., F; Watai, M; Honda, K; Edralin, M
  Proceedings of the 12th International Coral Reef Symposium, Cairns, Australia, 9-13 July 2012, ICRS2012_15B_3, 2012, [Peer-reviewed]
• Estimation of the distribution and coverage of seagrasses using field observation data and satellite imagery.
  Kyoda, J; Hosokawa, S; Watanabe, K; Nakaoka, M; Shibanuma, S; Montani, S; Kuwae,T
  Journal of Hydraulic, Coastal and Environmental Engineering, 68, 2, 1466, 1470, 2012, [Peer-reviewed]
  Japanese, Symposium
• Consumer of salmon carcasses in early winter of Eastern Hokkaido
  Kamauchi, H; Sato, S; Hayashi, D; Okabe, Y; Katsuyama, T; Fukushima, K; Yoshioka, A; Sato, T; Tokuchi, N; Nakaoka, M
  Forest Research, 78, 78, 81, 87, 京都大学フィールド科学教育研究センター森林生物圏部門, 2012, [Peer-reviewed]
  Japanese, 高緯度域では遡河性魚類によって河川に輸送される海洋由来栄養塩 (Marine derived nutrient : MDN)が河川内および河畔域の生物群集に影響を与えているとされる. 本研究では北海道東部の森林河川上流部において初冬にシロザケ死骸 (ホッチャレ)を約800kg 散布し, ホッチャレの消費者を明らかにした. 散布した死骸は10日間でほとんどすべて消費された. 自動撮影された画像から, 消費者はカラス類が優占しており, トビおよびオオワシを含めて鳥類が96% を占めた. カラス類は近隣の牧場で越冬している個体が移動したと思われた. 自動撮影された画像では, カラス類の摂食は少なくともホッチャレの一部が水面上に露出した場合に限られていたのに対して, オオワシは水面下のホッチャレも摂食した. 集水域の周囲の土地利用や河川の水深および河道形状がホッチャレの消費者組成に影響することが示唆された. 鳥類は, 秋にMDN を輸送するクマとは行動範囲や摂食パターンが異なるため, 初冬にシロザケが遡上する河川では, MDNの散布距離や散布量が秋とは異なることが考えられる.Marine derived nutrient (MDN), which is carried to stream by anadromous animals, affects stream and riparian ecosystems at high latitudes. To clarify the consumer of salmon carcasses during early winter of Eastern Hokkaido, we carried out a field experiment on spreading out carcasses (ca. 800 kg) at a woodland stream. Almost all of carcasses were consumed during 10 days. Crows was dominant, and birds abundance including black kite and Steller's sea eagle occupied 96 % of photo-trapping data. Crows were thought as immigrant from ranches surrounding experimental watershed. From the photo-trapping data, although crows fed only if, at least, a part of carcass was exposed over the water surface, Steller's sea eagle fed carcass even if it submerged. It suggests that land use of surrounding the watershed, channel morphology or depth of stream would affect the composition of carcasses consumer. Because of unique behavior (e.g. migration distance, feeding pattern) by bird, spreading distance and amount of MDN would show different pattern against autumn in streams that salmon runs in early winter.
• Asynchronous local dynamics contributes to stability of a seagrass bed in Tokyo Bay
  Takehisa Yamakita; Kentaro Watanabe; Masahiro Nakaoka
  ECOGRAPHY, 34, 3, 519, 528, Jun. 2011, [Peer-reviewed]
  English, Scientific journal
• Re-Structuring of Marine Communities Exposed to Environmental Change: A Global Study on the Interactive Effects of Species and Functional Richness
  Martin Wahl; Heike Link; Nicolaos Alexandridis; Jeremy C. Thomason; Mauricio Cifuentes; Mark J. Costello; Bernardo A. P. da Gama; Kristina Hillock; Alistair J. Hobday; Manfred J. Kaufmann; Stefanie Keller; Patrik Kraufvelin; Ina Kruger; Lars Lauterbach; Bruno L. Antunes; Markus Molis; Masahiro Nakaoka; Julia Nystrom; Zulkamal bin Radzi; Bjoern Stockhausen; Martin Thiel; Thomas Vance; Annika Weseloh; Mark Whittle; Lisa Wiesmann; Laura Wunderer; Takehisa Yamakita; Mark Lenz
  PLOS ONE, 6, 5, May 2011, [Peer-reviewed]
  English, Scientific journal
• Genetic structure and gene flow of eelgrass Zostera marina populations in Tokyo Bay, Japan: implications for their restoration
  Norio Tanaka; Teruko Demise; Mitsuhiro Ishii; Yasumasa Shoji; Masahiro Nakaoka
  Marine Biology, 158, 4, 871, 882, Apr. 2011, [Peer-reviewed], [Last author], [International Magazine]
  English, Scientific journal
• Inducible defence and its modulation by environmental stress in the red alga Chondrus yendoi (Yamada and Mikami in Mikami, 1965) from Honshu Island, Japan
  Andreas Kubicek; Kazuhiro Bessho; Masahiro Nakaoka; Martin Wahl; Mark Lenz
  JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 397, 2, 208, 213, Feb. 2011, [Peer-reviewed]
  English, Scientific journal
• Importance of considering grain and extent for the analysis on spatial dynamics: perspectives from comparison between theory and empirical example on seagrass bed dynamics in Tokyo Bay
  Takehisa Yamakita; Masahiro Nakaoka
  INTERNATIONAL CONFERENCE: SPATIAL THINKING AND GEOGRAPHIC INFORMATION SCIENCES 2011, 21, 177, 183, 2011, [Peer-reviewed]
  English, International conference proceedings
• Temporal and spatial variations in functional-trait composition (functional diversity) of macrocrustacean communities in seagrass meadows
  Yamada K; Hori M; Nakaoka M; Hamaguchi M
  Crustaceana Monographs, 15, 325, 339, 2011, [Peer-reviewed]
• A simple and robust procedure for coring unconsolidated sediment in shallow water
  Hiroshi Adachi; Hiroya Yamano; Toshihiro Miyajima; Masahiro Nakaoka
  JOURNAL OF OCEANOGRAPHY, 66, 6, 865, 872, Dec. 2010, [Peer-reviewed]
  English, Scientific journal
• Seasonality in the strength and spatial scale of processes determining intertidal barnacle population growth
  Keiichi Fukaya; Takehiro Okuda; Masahiro Nakaoka; Masakazu Hori; Takashi Noda
  JOURNAL OF ANIMAL ECOLOGY, 79, 6, 1270, 1279, Nov. 2010, [Peer-reviewed]
  English, Scientific journal
• Contribution of environmental and spatial processes to rocky intertidal metacommunity structure
  Takehiro Okuda; Takashi Noda; Tomoko Yamamoto; Masakazu Hori; Masahiro Nakaoka
  ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY, 36, 4, 413, 422, Jul. 2010, [Peer-reviewed]
  English, Scientific journal
• Temporal changes in benthic communities of seagrass beds impacted by a tsunami in the Andaman Sea, Thailand
  Napakhwan Whanpetch; Masahiro Nakaoka; Hiroshi Mukai; Takao Suzuki; Satoshi Nojima; Takashi Kawai; Chittima Aryuthaka
  ESTUARINE COASTAL AND SHELF SCIENCE, 87, 2, 246, 252, Apr. 2010, [Peer-reviewed]
  English, Scientific journal
• Distance decay of community dynamics in rocky intertidal sessile assemblages evaluated by transition matrix models
  Masahiro Tsujino; Masakazu Hori; Takehiro Okuda; Masahiro Nakaoka; Tomoko Yamamoto; Takashi Noda
  POPULATION ECOLOGY, 52, 1, 171, 180, Jan. 2010, [Peer-reviewed]
  English, Scientific journal
• Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan
  Katsumasa Yamada; Masakazu Hori; Yoshiyuki Tanaka; Natsuki Hasegawa; Masahiro Nakaoka
  ESTUARINE COASTAL AND SHELF SCIENCE, 86, 1, 71, 82, Jan. 2010, [Peer-reviewed]
  English, Scientific journal
• Relative contribution of environmental and spatial processes on determining community structure: A comparison among taxa in rocky intertidal assemblages
  Okuda T; Noda T; Yamamoto T; Hori M; Nakaoka M
  Japanese Journal of Ecology, 60, 2, 227, 239, 2010, [Peer-reviewed]
• High seagrass diversity and canopy-height increase associated fish diversity and abundance
  Masakazu Hori; Takao Suzuki; Yaowaluk Monthum; Tippamas Srisombat; Yoshiyuki Tanaka; Masahiro Nakaoka; Hiroshi Mukai
  MARINE BIOLOGY, 156, 7, 1447, 1458, Jun. 2009, [Peer-reviewed]
  English, Scientific journal
• Latitudinal gradients in species richness in assemblages of sessile animals in rocky intertidal zone: mechanisms determining scale-dependent variability
  Takehiro Okuda; Takashi Noda; Tomoko Yamamoto; Masakazu Hori; Masahiro Nakaoka
  JOURNAL OF ANIMAL ECOLOGY, 78, 2, 328, 337, Mar. 2009, [Peer-reviewed]
  English, Scientific journal
• Scale dependency in seagrass dynamics: how does the neighboring effect vary with grain of observation?
  Takehisa Yamakita; Masahiro Nakaoka
  POPULATION ECOLOGY, 51, 1, 33, 40, Jan. 2009, [Peer-reviewed]
  English, Scientific journal
• Animals on marine flowers: does the presence of flowering shoots affect mobile epifaunal assemblage in an eelgrass meadow?
  Masahiro Nakaoka; Masatoshi Matsumasa; Tetsuhiko Toyohara; Susan L. Williams
  MARINE BIOLOGY, 153, 4, 589, 598, Feb. 2008, [Peer-reviewed]
  English, Scientific journal
• Temporal and spatial macrofaunal community changes along a salinity gradient in seagrass meadows of Akkeshi-ko estuary and Akkeshi Bay, northern Japan
  Katsumasa Yamada; Masakazu Hori; Yoshiyuki Tanaka; Natsuki Hasegawa; Masahiro Nakaoka
  HYDROBIOLOGIA, 592, 1, 345, 358, Nov. 2007, [Peer-reviewed]
  English, Scientific journal
• Ten Years' Monitoring of Intertidal Macroalgal Vegetation of Hyogo Prefecture, Northwestern Coast of Honshu, Japan to Assess the Impact of the Nakhodka Oil Spill
  Hiroshi Kawai; Mitsunobu Kamiya; Teruhisa Komatsu; Masahiro Nakaoka; Tomoko Yamamoto; Marine Life; Research Group of; Takeno Marine Life Research; Group of Takeno
  ALGAE, 22, 1, 37, The Korean Society of Phycology, Mar. 2007, [Peer-reviewed]
• Spatial dynamics of seagrass beds analyzed with an integrated approach using remote sensing and citizen-based monitoring
  Yoshida M; Kouchi N; Nakaoka M
  Japanese Journal of Conservation Ecology, 12, 1, 10, 19, The Ecological Society of Japan, 2007, [Peer-reviewed]
  Japanese
• Interspecific variation in photosynthesis and respiration balance of three seagrasses in relation to light availability
  Yoshiyuki Tanaka; Masahiro Nakaoka
  MARINE ECOLOGY PROGRESS SERIES, 350, 63, 70, 2007, [Peer-reviewed]
  English, Scientific journal
• Tsunami impacts on biodiversity of seagrass communities in the Andaman Sea, Thailand: (2) Abundance and diversity of benthic animals
  WHANPETCH NAPAKHWAN; NAKAOKA MASAHIRO; MUKAI HIROSHI; SUZUKI TAKAO; NOJIMA SATOSHI; KAWAI TAKASHI; ARYUTHAKA CHITTIMA
  Selected Papers of the NaGISA Wrold Congress 2006, 8, 57, 66, Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, 2007, [Peer-reviewed]
  English, Seagrass beds support highly productive and diverse animal communities. Extreme physical disturbances such as tsunamis are expected to affect the abundance and diversity of both the seagrass and the infaunal community. To examine the effects of a tsunami on infaunal seagrass communities, we compared the communities in seagrass beds before and after the tsunami that hit the Andaman Sea coast of Thailand on December 26th, 2004. Infauna were collected in 2001 and again in 2005 from inside and outside seagrass vegetation. Polychaetes were the most abundance taxa, followed by crustaceans. Density of macrobenthic animals varied greatly among sites, among areas inside and outside the vegetated areas and between the two years. The density increased over time in the areas with seagrass while it deceased in the non-vegetated areas, suggesting that the tsunami impacted the two areas differently. Multivariate analysis on the polychaete assemblage revealed that temporal changes in assemblage structure differed between vegetated and non-vegetated areas, and that the degree of temporal changes in assemblage structure was not necessarily related to the magnitude of the tsunami.
• Tsunami impacts on biodiversity of seagrass communities in the Andaman Sea, Thailand: (1) Seagrass abundance and diversity.
  NAKAOKA MASAHIRO; TANAKA YOSHIYUKI; MUKAI HIROSHI; SUZUKI TAKAO; ARYUTHAKA CHITTIMA
  Selected Papers of the NaGISA Wrold Congress 2006, 8, 49, 56, Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, 2007, [Peer-reviewed]
  English, Evaluation of the impact of a catastrophic disturbance on biodiversity is often difficult due to a lack of sufficient quantitative data on biological communities prior to the disturbance. Since 2001, we have been monitoring the abundance and biomass of seagrass and its associated animal community along the Andaman Sea coast of Thailand, an area that was hit by a tsunami originating in the Indian Ocean on Dec. 26, 2004. To quantitatively evaluate the effects of the disturbance on the biodiversity of the seagrass community we carried out a comparative analysis of seagrass species diversity and abundance based on pre-/post-disturbance data at several seagrass beds at Kuraburi, northern Phang-nga (most-affected region) and Trang (less-affected region). Species diversity, coverage and biomass of seagrass declined greatly after the tsunami at one seagrass bed (Thung Nang Dam) in Kuraburi. The effect of the tsunami was less obvious at two other beds a few kilometers away from Thung Nang Dam, and at the seagrass beds in Haad Chao Mai National Park in Trang (located ca. 200km south of Kuraburi), where temporal change before and after the tsunami was the least obvious. A steady decline in biomass was observed in the three seagrass beds that had not been severely affected by the tsunami, possibly associated with other types of disturbance such as river discharge. Analyses revealed that the effect of the tsunami on seagrass ecosystems was highly variable even on small spatial scales, and that other factors causing disturbance to the seagrass beds are important factors of the observed temporal variation.
• Effects of temporal dynamics and vertical structure of the seagrass Zostera caulescens on distribution and recruitment of the epifaunal encrusting bryozoa Microporella trigonellata
  Naoko Kouchi; Masahiro Nakaoka; Hiroshi Mukai
  MARINE ECOLOGY-AN EVOLUTIONARY PERSPECTIVE, 27, 2, 145, 153, Jun. 2006, [Peer-reviewed]
  English, Scientific journal
• Similarity of rocky intertidal assemblages along the Pacific coast of Japan: effects of spatial scales and geographic distance
  Masahiro Nakaoka; Norihiko Ito; Tomoko Yamamoto; Takehiro Okuda; Takashi Noda
  ECOLOGICAL RESEARCH, 21, 3, 425, 435, May 2006, [Peer-reviewed]
  English, Scientific journal
• Morphological variation in the tropical seagrasses, Cymodocea serrulata and C-rotundata, in response to sediment conditions and light attenuation
  Yoshiyuki Tanaka; Masahiro Nakaoka
  BOTANICA MARINA, 49, 5-6, 365, 371, 2006, [Peer-reviewed]
  English, Scientific journal
• Plant-animal interactions in seagrass beds: ongoing and future challenges for understanding population and community dynamics
  M Nakaoka
  POPULATION ECOLOGY, 47, 3, 167, 177, Dec. 2005, [Peer-reviewed]
  English
• Seasonal variation in vegetative growth and production of the endemic Japanese seagrass Zostera asiatica: a comparison with sympatric Zostera marina
  M Watanabe; M Nakaoka; H Mukai
  BOTANICA MARINA, 48, 4, 266, 273, 2005, [Peer-reviewed]
  English, Scientific journal
• Latitudinal gradient of species diversity: multi-scale variability in rocky intertidal sessile assemblages along the Northwestern Pacific coast
  T Okuda; T Noda; T Yamamoto; N Ito; M Nakaoka
  POPULATION ECOLOGY, 46, 2, 159, 170, Aug. 2004, [Peer-reviewed]
  English, Scientific journal
• Species diversity and abundance of seagrasses in southwestern Thailand under different influence of river discharge.
  NAKAOKA Masahiro; TANAKA Yoshiyuki; WATANABE Masako
  Coastal Marine Science, 29, 1, 75, 80, The University of Tokyo, Apr. 2004, [Peer-reviewed]
  English, Seagrass beds are among the most important components in coastal ecosystem, but are susceptible to human-induced changes in terrestrial ecosystem. As a first step to understand the effects of terrestrial input through river discharge on tropical seagrass ecosystems, we carried out quantitative mapping of seagrass beds at Pang-gna and Trang Provinces, southwestern Thailand to examine spatial variation in species composition, species diversity and biomass of seagrasses. Five seagrass beds were chosen as study sites that locate at different distances from the major river mouths, and thus subjected to different impacts of river discharge. These seagrass beds differed greatly in environmental conditions, seagrass diversity and abundance. Seagrass beds located near large river mouths showed higher silt-clay content in the sediments and light attenuation of water, possibly due to transportation of sediment from rivers and its resuspension. A total of nine seagrass species occurred. Enhalus acoroides and Halophila ovalis occurred in all the stations, whereas distribution of other species were mostly confined to seagrass beds with small or moderate degree of siltation and light attenuation. Seagrass species diversity measured by species richness and Simpson's diversity index was lower in seagrass beds near the river mouth. These findings highlight negative impacts of terrestrial ecosystems through river discharge on seagrass biodiversity and its functioning along the coastal areas of southwestern Thailand.
• Water flow and sediment in Enhalus acoroides and other seagrass beds in the Andaman Sea, off Khao Bae Na, Thailand
  KOMATSU Teruhisa; UMEZAWA Yu; NAKAKOKA Masahiro; SUPANWANID Chatcharee; KANAMOTO Ziyusei
  Coastal Marine Science, 29, 1, 63, 68, The University of Tokyo, Apr. 2004, [Peer-reviewed]
  English, To examine influences of tropical seagrass on marine physical environments, water flow and the sedimentation rate were measured in seagrass beds in the Andaman Sea, off Khao Bae Na, Trang Province, Thailand, in December 1998. Vertical profiles of water flow inside the seagrass beds and a sand bed were investigated using gypsum balls. Water flow inside beds of Enhalus acoroides (L.f.) Royle, which has large blades, was much smaller than that inside beds of Thalassia hemprichii (Ehrenb.) Aschers. and Halophila ovalis (R.Br.) Hook. f., which have small blades, or in the sand bed. The sedimentation rate measured with sediment traps inside the E. acoroides beds was greater than that inside the T. hemprichii beds at each station. The percentage of mud in the sediments inside an E. acoroides patch was higher than that outside it at the same station. Negatively proportional to water flow, the phi median diameters of sediments in the Enhalus beds were greater than those in the sand (unvegatated area) or Thalassia beds at the same station. These facts suggest that the vertical reduction in water flow depends on differences in the formation of seagrass meadows, and the sedimentation rate and sediment composition are influenced by the retardation of the water flow by the seagrass meadows.
• Analysis of Biodiversity-Ecosystem Functioning Relationship in Intertidal Rockyshore Communities
  Aizawa Akihito; Nakaoka Masahiro; Noda Takashi; Yamamoto Tomoko; Hori Masakazu
  Abstracts of the Annual Meeting of the Ecological Society of Japan, ESJ51, 394, 394, THE ECOLOGICAL SOCIETY OF JAPAN, 2004
  近年、地球規模での生物多様性の減少が問題となっている。生物多様性を保全する理由のひとつとして、生物多様性と生態系機能に正の相関があることが指摘されている。このことは最近の群集生態学における大きなテーマのひとつであり、草原や微生物群集を対象に研究が進んでいる。しかし両者の関係が野外生物群集一般に適用できるかどうかは不明である。特に環境要因の変異や空間スケールの差異が与える影響については十分に検討されていない。そこで本研究では岩礁潮間帯生物群集を対象に、複数の空間スケールを階層的に配置した研究デザインによりその関係性を解析した。
  日本の太平洋側の6つの地域(道東、道南、三陸、房総、南紀、大隅)において、地域内に5海岸、さらにその海岸内に５測点を選定した。各測点で岩礁潮間帯のほぼ垂直な岩盤上で平均潮位の上下それぞれにコドラート(50cm×50cm)を設置し、各コドラート内の100の格子点を占有する種の変遷と潮位ごとでの全出現種を記録した。計300コドラートの2003年春から2004年春への1年間のデータの推移を基に解析を行った。本実験での生物多様性とは、種多様性を意味し、_丸1_Simpsonの多様度指数、_丸2_全出現種数の２つを空間スケールごとに求めた。また生態系機能の指標としては、_丸1_現存量(2004年の被度)_丸2_安定性(2003-2004年の被度の変化_丸3_抵抗性(2003年は生物だった点が2004年に裸地にならない割合_丸4_回復性(2003年は裸地であった点が2004年に生物になる割合)を求めた。これらについて空間スケールごとに相関解析を行った。また、環境要因をとりいれた多変量解析を行い、環境要因と種多様性が生態系機能に与える相対的重要性を検討した。
  
• Emergence stress and morphological constraints affect the species distribution and growth of subtropical intertidal seagrasses
  Y Tanaka; M Nakaoka
  MARINE ECOLOGY PROGRESS SERIES, 284, 117, 131, 2004, [Peer-reviewed]
  English, Scientific journal
• Seasonal dynamics of Zostera caulescens: relative importance of flowering shoots to net production
  M Nakaoka; N Kouchi; K Aioi
  AQUATIC BOTANY, 77, 4, 277, 293, Dec. 2003, [Peer-reviewed]
  English, Scientific journal
• Phylogenetic relationships in the genera Zostera and Heterozostera (Zosteraceae) based on matK sequence data
  N Tanaka; J Kuo; Y Omori; M Nakaoka; K Aioi
  JOURNAL OF PLANT RESEARCH, 116, 4, 273, 279, Aug. 2003, [Peer-reviewed]
  English, Scientific journal
• Distribution, productivity, life history and biodiversity of seagrass community along Sanriku Coast: A review
  Nakaoka Masahiro; Aioi Keiko; Kouchi Naoko; Omori Yuji; Tanaka Norio; Tatsukawa Ken-ichi
  Otsuchi Marine Science, 28, 31, 38, The University of Tokyo, Mar. 2003, [Peer-reviewed]
  English, The seagrass flora in Japan is characterized by the occurrence of several species of Zosteraceae that are considered to be endemic to the northwestern Pacific. In seagrass beds along Sanriku Coast, northeastern Honshu Island of Japan, the endemic Zostera spp. generally occur at subtidal soft bottom, usually forming multispecific seagrass beds with the cosmopolitan eelgrass Z. marina. This paper reviews some of the recent studies on ecology of the seagrass community conducted at Otsuchi Bay, Funakoshi Bay and Yamada Bay along Sanriku Coast of Iwate Prefecture. We specially focus on following subjects ; (1) spatial distribution of Z. caespitosa in Yamada Bay surveyed using eco-sounding techniques, (2) comparative studies on morphological and life history traits of Zostera spp., (3) quantitative estimation on shoot dynamics, growth and primary production of Z. caulescens, (4) ecology of epifaunal community on the aboveground parts of seagrasses, and (5) population genetic structure and gene flow among populations of Z. caespitosa analyzed using molecular data. The results of these studies showed that the seagrass community along Sanriku Coast is one of the most productive parts of the coastal ecosystem, and that various environmental and biological factors are involved in a complex manner to produce observed patterns of population structure and dynamics of the seagrass community.
• Impacts by heavy-oil spill from the Russian tanker Nakhodka on intertidal ecosystems: recovery of animal community
  T Yamamoto; M Nakaoka; T Komatsu; H Kawai; K Ohwada
  MARINE POLLUTION BULLETIN, 47, 1-6, 91, 98, 2003, [Peer-reviewed]
  English, Scientific journal
• 市民参加による沖縄の海草藻場のモニタリング調査
  YOSHIDA Masahito; KOUCHI Naoko; NAKAOKA Masahiro
  保全生態学研究, 8, 2, 119, 128, The Ecological Society of Japan, 2003, [Peer-reviewed]
  Japanese, The largest seagrass bed along the coast of Okinawa Island, southwestern Japan, is located offshore from Henoko and covers 173 ha; the second largest is offshore from Awase and covers 112 ha. Both of these seagrass beds are threatened by the proposed construction of a U.S. military airport and by reclamation. To ensure that the environmental impact assessment compiled before development is fair and correct, an independent scientific survey conducted by citizens should be effective to monitor the development. Given these facts, the Nature Conservation Society of Japan decided to launch a community-based Seagrass-Watch monitoring program called "Okinawa Jangusa-Watch". In this program, volunteers were first trained to identify seagrasses and in the survey method; then, they measured the coverage of each seagrass species by snorkeling at two sites (Kayo and Henoko). After calibrating each observer's error, the distribution and abundance of seagrass were analyzed for each site. Each seagrass species had a specific distribution pattern, based on the distance from the shore. At Henoko, the seagrass coverage determined from the analysis of aerial photos was underestimated, as compared to the coverage measured in the ground survey. A mitigation plan that considers the variation in species composition and seagrass coverage obtained using the ground survey is needed to assess the effects of relocating the U S. military airport. Wide-range, long-term monitoring of seagrass beds by citizens should be effective with regard to monitoring the impact of red soil erosion and global environment change on seagrass beds, and in monitoring specific development projects.
• 陸域の改変と沿岸生態系の変化
  Komatsu Teruhisa; Nakaoka Masahiro; Sugimoto Takashige
  沿岸海洋研究, 40, 2, 149, 157, 日本海洋学会沿岸海洋研究部会, 2003, [Peer-reviewed]
  Japanese, Impacts due to modifications of land use pattern on a coastal ecosystem can be classified into two categories: direct or indirect impact. This article examines real cases if they belong to one of two categories. The direct impacts are the effects of the human activities in lands that directly destroy important components in the coastal ecosystems such as tidal flats, seaweed and seagrass beds, and coral reefs. They are irreversible modification of land enlargement. The direct impact not only destroys tidal flats, seaweed and seagrass beds, and coral reefs, but also influences production and reproduction of marine creatures utilizing these areas as for spawning and/or nursery grounds during their life history. Such direct impact will become the primary cause of reduction of the population of the marine creatures. Because the river improvements and the dam constructions with concrete also destroy directly the habitats of diadromous animals in fresh water and interrupt their life history, these activities are considered to be the direct impact. The indirect impact implies modifications of land use patterns such as influence of coastal ecosystems due to changes of quantity of materials contained in the river water. Indirect impacts can be considered in two categories: physical or biochemical impact. The indirect impacts are caused by constructions of dams and drainage ways, deforestation, enlargement of crop and pasture land, use of large quantity of fertilizer and urban/industrial sewage. The indirect physical impact means that increase/decrease of fresh water and/or sediments in river outflow physically affect the coastal ecosystems, which further influence disappearances of the biological transportation and habitats in the coastal waters. Such influence is caused through changes of distribution patterns of salinity and density of seawater, estuarine circulation, sedimentation, erosion of sea bottom, and turbidity. There are two causes of the indirect biochemical impacts changing the coastal ecosystems: (a) fluctuation of the nutrient supply to the sea and also by the biological activities affected by such fluctuation (eutrophication and oligotrophication) and (b) increase of toxic substance load (such as heavy metals and endocrine disrupters) flow out to the coastal waters from rivers. Because neither direct nor indirect impacts have been sufficiently investigated, it is highly necessary for an integrated study and monitoring of the ecosystem along with the water circulation from land to the sea as an important component.
• Impacts of the Nakhodka heavy-oil spill on an intertidal ecosystem: an approach to impact evaluation using geographical information system
  K Teruhisa; N Masahiro; K Hiroshi; Y Tomoko; O Kouichi
  MARINE POLLUTION BULLETIN, 47, 1-6, 99, 104, 2003, [Peer-reviewed]
  English, Scientific journal
• Impacts of dugong foraging on benthic animal communities in a Thailand seagrass bed
  M Nakaoka; H Mukai; S Chunhabundit
  ECOLOGICAL RESEARCH, 17, 6, 625, 638, Nov. 2002, [Peer-reviewed]
  English, Scientific journal
• Predation on seeds of seagrasses Zostera marina and Zostera caulescens by a tanaid crustacean Zeuxo sp.
  M Nakaoka
  AQUATIC BOTANY, 72, 2, 99, 106, Mar. 2002, [Peer-reviewed]
  English, Scientific journal
• Gene flow among populations of Zostera caespitosa Miki (Zosteraceae) in Sanriku Coast, Japan
  Tanaka Norio; Omori Yuji; Nakaoka Masahiro; Aioi Keiko
  Otsuchi Marine Science, 27, 17, 22, The University of Tokyo, Mar. 2002, [Peer-reviewed]
  English
• Mapping of seagrass and seaweed beds using hydro-acoustic methods
  Teruhisa Komatsu; Chiaki Igararashi; Ken-ichi Tatsukawa; Masahiro Nakaoka; Tomonori Hiraishi; Asahiko Taira
  FISHERIES SCIENCE, 68, sup1, 580, 583, 2002, [Peer-reviewed]
  English, Scientific journal
• Seasonal and between-substrate variation in mobile epifaunal community in a multispecific seagrass bed of Otsuchi Bay, Japan
  M Nakaoka; T Toyohara; M Matsumasa
  MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I, 22, 4, 379, 395, Dec. 2001, [Peer-reviewed]
  English, Scientific journal
• Population Dynamics and Life History Traits of Siphonacmea oblongata (Yokoyama) on Seagrass Leaves in Otsuchi Bay, North-Eastern Japan (Siphonariidae, Pulmonata)
  TOYOHARA T.
  Venus (Journal of the Malacological Society of Japan), 60, 27, 36, Jun. 2001, [Peer-reviewed]
• Ecology of seagrasses Zostera spp. (Zosteraceae) in Japanese waters: A review
  Nakaoka Masahiro; Aioi Keiko
  Otsuchi Marine Science, 26, 7, 22, The University of Tokyo, Mar. 2001, [Peer-reviewed]
  English
• Small-scale Variation in a Benthic Community at an Intertidal Flat in Thailand: Effects of Spatial Heterogeneity of Seagrass Vegetation
  NAKAOKA M.
  BENTHOS RESEARCH, 56, 63, 71, 2001, [Peer-reviewed]
• Magnitude of within-patch variation in seagrass Halophila ovalis growth affected by adjacent Thalassia hemprichii vegetation
  Masahiro Nakaoka; Hitoshi Iizumi
  Ecological Research, 15, 4, 415, 424, Wiley, Dec. 2000, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Nonlethal effects of predators on prey populations: predator-mediated change in bivalve growth
  M Nakaoka
  ECOLOGY, 81, 4, 1031, 1045, Apr. 2000, [Peer-reviewed]
  English, Scientific journal
• Effects of Seagrass Patch Structure on the Mobile Epifaunal Community in a Subtidal Seagrass Meadow in Thailand
  Masahiro Nakaoka; Tetsuhiko Toyohara
  BENTHOS RESEARCH, 55, 2, 53, The Japanese Association of Benthology, 2000, [Peer-reviewed]
• Dugong grazing on Halophila beds in Haad Chao Mai National Park
  MUKAI H.
  Biologia Marina Mediterranea, 7, 268, 270, 2000, [Peer-reviewed]
• Water flow and sedimentation rate in seagrass beds off Khao Baena in Trang Province, Thailand
  KOMATSU T.
  Biologia Marina Mediterranea, 7, 240, 242, 2000, [Peer-reviewed]
• Distribution of encrusting bryozoa on Zostera caulescens in Funakoshi Bay, Japan: effects of seagrass vertical structure on epifauna
  Biologia Marina Mediterranea, 2000, [Peer-reviewed]
• Growth and productivity of Zostera asiatica and Zostera marina in Akkeshi, northern Japan
  WATANABE M.
  Biologia Marina Mediterranea, 7, 156, 159, 2000, [Peer-reviewed]
• Growth and shoot dynamics of Zostera caulescens Miki in Funakoshi Bay, Japan: how does it maintain high canopy structure?
  Biologia Marina Mediterranea, 2000, [Peer-reviewed]
• A new record of Zostera asiatica Miki (Zosteraceae) in Funakoshi Bay, Iwate Prefecture
  Aioi Keiko; Nakaoka Masahiro; Kouchi Naoko; Omori Yuji
  Otsuchi Marine Science, 25, 23, 26, The University of Tokyo, 2000, [Peer-reviewed]
  English
• Population dynamics and reproductive traits of phytal gastropods in seagrass bed in Otsuchi Bay, north-eastern Japan
  T Toyohara; M Nakaoka; K Aioi
  MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I, 20, 3-4, 273, 289, Dec. 1999, [Peer-reviewed]
  English, Scientific journal
• Growth of seagrass Halophila ovalis at dugong trails compared to existing within-patch variation in a Thailand intertidal flat
  M Nakaoka; K Aioi
  MARINE ECOLOGY PROGRESS SERIES, 184, 97, 103, 1999, [Peer-reviewed]
  English, Scientific journal
• Development of evaluation method of impacts by heavy-oil pollution on inter-tidal ecosystem using Goegraphical Information System (GIS).
  Komatsu Teruhisa; Nakaoka Masahiro; Kawai Hiroshi; Marine Life Research Group of Takeno Snookering Center
  Bulletin on Coastal Oceanography, 37, 1, 35, 39, 日本海洋学会沿岸海洋研究部会, 1999, [Peer-reviewed]
  Japanese, Recently, heavy-oil spills from tankers such as Nakhodka have occurred around Japan. However, it is unknown that what influence on a coastal ecosystem will appear in long-term. Because leaked heavy-oil is lighter than seawater, it is estimated that the heavy-oil influences inter-tidal flora and fauna in the coastal ecosystem. Thus, we aimed to evaluate impacts on the inter-tidal ecosystem caused by heavy-oil pollution by using Geographical Information System (GIS). We have mapped individual number or covarage of plant and animal species in an inter-tidal zone along the shore polluted by the heavy-oil spill from the Nakhodka. Mapping these data to a base map of GIS, we conduct a long-term observation of flora and fauna. In this way, we developed the method to evaluate the impacts of heavy-oil spill on the inter-tidal community, monitoring the recovering process of the inter-tidal ecosystem after the accident.
• Seasonal variation in reproduction and population structure of the bivalve Limopsis tajimae in the upper bathyal zone of Suruga Bay, Japan
  M Nakaoka; S Ohta
  MARINE BIOLOGY, 132, 3, 471, 481, Oct. 1998, [Peer-reviewed]
  English, Scientific journal
• Optimal resource allocation of the marine bivalve Yoldia notabilis: The effects of size-limited reproductive capacity and size-dependent mortality
  Masahiro Nakaoka
  Evolutionary Ecology, 12, 3, 347, 361, Springer Nature, 1998, [Peer-reviewed]
  English, Scientific journal
• Demography of the marine bivalve Yoldia notabilis in fluctuating environments: An analysis using a stochastic matrix model
  M Nakaoka
  OIKOS, 79, 1, 59, 68, May 1997, [Peer-reviewed]
  English, Scientific journal
• Dynamics of age- and size-structured populations in fluctuating environments: Applications of stochastic matrix models to natural populations
  M Nakaoka
  RESEARCHES ON POPULATION ECOLOGY, 38, 2, 141, 152, Dec. 1996, [Peer-reviewed]
  English, Scientific journal
• Size-dependent survivorship of the bivalve Yoldia notabilis (Yokoyama, 1920): The effect of crab predation
  M Nakaoka
  JOURNAL OF SHELLFISH RESEARCH, 15, 2, 355, 362, Jun. 1996, [Peer-reviewed]
  English, Scientific journal
• SIZE-DEPENDENT REPRODUCTIVE TRAITS OF YOLDIA-NOTABILIS (BIVALVIA, PROTOBRANCHIA)
  M NAKAOKA
  MARINE ECOLOGY PROGRESS SERIES, 114, 1-2, 129, 137, Nov. 1994, [Peer-reviewed]
  English, Scientific journal
• ANNUAL VARIATION IN THE GROWTH-RATE OF YOLDIA-NOTABILIS (BIVALVIA, NUCULANIDAE) IN OTSUCHI BAY, NORTHEASTERN JAPAN, ANALYZED USING SHELL MICROGROWTH PATTERNS
  M NAKAOKA; S MATSUI
  MARINE BIOLOGY, 119, 3, 397, 404, Jun. 1994, [Peer-reviewed]
  English, Scientific journal
• YEARLY VARIATION IN RECRUITMENT AND ITS EFFECT ON POPULATION-DYNAMICS IN YOLDIA-NOTABILIS (MOLLUSCA, BIVALVIA), ANALYZED USING PROJECTION MATRIX MODEL
  M NAKAOKA
  RESEARCHES ON POPULATION ECOLOGY, 35, 2, 199, 213, Dec. 1993, [Peer-reviewed]
  English, Scientific journal
• SPATIAL AND SEASONAL-VARIATION IN GROWTH-RATE AND SECONDARY PRODUCTION OF YOLDIA-NOTABILIS IN OTSUCHI BAY, JAPAN, WITH REFERENCE TO THE INFLUENCE OF FOOD-SUPPLY FROM THE WATER COLUMN
  M NAKAOKA
  MARINE ECOLOGY PROGRESS SERIES, 88, 2-3, 215, 223, Nov. 1992, [Peer-reviewed]
  English, Scientific journal
• Age Determination and Growth Analysis Based on External Shell Rings of the Protobranch Bivalve Yoldia notabilis YOKOYAMA in Otsuchi Bay, Northeastern Japan
  MASAHIRO NAKAOKA
  BENTHOS RESEARCH, 1992, 43, 53, 66, The Japanese Association of Benthology, 1992, [Peer-reviewed]
  English, Age structure and growth pattern of Yoldia notabilis in Otsuchi Bay, northeastern Japan were studied using samples collected monthly during the period between December 1989 and December 1990. Y. notabilis has growth rings on external shell surface, and it was found that the formation of the "major ring" occurs annually during late winter to early spring. Age of Y. notabilis can be determined up to seven years old by counting number of the major rings, whereas only four younger year classes are separable from size-frequency histograms. Mean shell lengths of the four youngest year classes separated by the two methods are identical to each other. The growth rate of Y. notabilis is very slow at 0 year old ; achieving only 1.3mm in shell length by the first winter. The growth becomes rapid after the first year and the animal reaches 32.0mm at the age of seven years old. The obtained growth curve shows a sigmoidal pattern and the Gompertz growth equation gives a best fit for the data.

• Preface: Blue carbon studies in Asia-Pacific regions: Current status, gaps, and future perspectives
  Sahadev Sharma; Rempei Suwa; Raghab Ray; Mohammad Rozaimi; Richard A. MacKenzie; Masahiro Nakaoka, ECOLOGICAL RESEARCH, 37, 1, 5, 8, Jan. 2022
  English, Others
• Use of Marine and Coastal Ecosystem in Japan, Consideration of Future Scenarios
  山北剛久; 堀正和; 石川洋一; 仲岡雅裕; 山野博哉; 牧野光琢; 名波敦; 白山義久, 日本生態学会大会講演要旨(Web), 68th, 2021
• Carbon sequestration by seagrass and macroalgae in Japan: estimates and future needs
  Blue carbon in shallow coastal ecosystems, 2019
• 海底の地図化における深層学習の活用:画像認識によるクモヒトデ類の抽出,海草藻場分布の画像-画像変換による地図化
  山北剛久; 山北剛久; 横岡博之; 袖山史彰; 藤原義弘; 河戸勝; 土田真二; 石橋正二郎; 黒川忠之; LINDSAY Dhugal; 仲岡雅裕; 渡辺健太郎; WANPETCH Napakhwan; 屋良由美子; 松葉史紗子; 藤倉克則, 日本地球惑星科学連合大会予稿集(Web), 2018, 2018
• Sato-umi in the Anthropocean: Report from a Forum Co-Sponsored by the Aquerium of the Pacificc and American Honda in Partnership with the Honda Marine Science Foundation
  American Honda, 2017
• 三陸沿岸域におけるアマモ場の東日本大震災前後の変化
  Nippon Suisan Gakkaishi, 2017, [Lead author]
• 海洋生物の多様性
  シリーズ現代の生態学10 海洋生態学, 2016
• 海底生態系
  シリーズ現代の生態学10 海洋生態学, 2016
• 東北地方太平洋沖地震によるアマモ類群落の攪乱と回復過程における遺伝的多様性の変動
  田中法生; 山田勝雅; 仲岡雅裕, 日本植物分類学会大会研究発表要旨集, 14th, 2015
• Progress in the 21st century: a Roadmap for the Ecological Society of Japan
  Tsutomu Enoki; Tohru Nakashizuka; Shin-ichi Nakano; Takeshi Miki; Yu-Pin Lin; Masahiro Nakaoka; Eri Mizumachi; Hideaki Shibata, ECOLOGICAL RESEARCH, 29, 3, 357, 368, May 2014
  English, Others
• 海草藻場のパッチ状分布が小型無脊椎動物の機能群多様性の空間異質性を促進する:機能群構造決定機構における環境と空間の相対的重要性
  山田勝雅; 田中義幸; 仲岡雅裕, 日本生態学会大会講演要旨(Web), 61st, 2014
• フィリピン・ボリナオにおけるサバヒー養殖漁業が沿岸生態系に与える影響
  頼末武史; 仲岡雅裕; 本多健太郎; LEOPARDAS Venus; 田中義幸; 中村洋平; 宮島利宏; FORTES Miguel D; GO Gay Amabelle; BOLISAY Klenthon; PACIENCIA Francisco, Jr.; EDRALIN Monica; SARCEDA Monica; UY Wilfredo H.; PANTALLANO Allyn, 日本水産学会大会講演要旨集, 2014, 2014
• 遺伝解析と幼生分散モデルの統合によるクマノミ属魚類の幼生分散プロセスの解明
  佐藤允昭; BERNARDO Lawrence P.C; 黒河内寛之; 本多健太郎; BOLISAY Klenthon O; 中村洋平; 練春蘭; 灘岡和夫; FORTES Miguel D; 仲岡雅裕, 日本生態学会大会講演要旨(Web), 61st, D2-09 (WEB ONLY), 2014
  Japanese
• Akkeshi marine station, field science center for northern biosphere, Hokkaido University(from field research sites (26))
  Nakaoka M; Isada T; Honda K; Kitamura T, Japanese Journal of Ecology, 64, 1, 87, 91, 2014
  The Ecological Society of Japan, Japanese
• Regional Comparison of the Ecosystem Services from Seagrass Beds in Asia
  Masahiro Nakaoka; Kun-Seop Lee; Xiaoping Huang; Tutu Almonte; Japar Sidik Bujang; Wawan Kiswara; Rohani Ambo-Rappe; Siti Maryam; Yaakub, M; P; Prabhakaran; M. K. Abu Hena; Masakazu Hori; Peidong Zhang; Anchana Prathep; Miguel D. Fortes, Integrative Observations and Assessments, 367, 2014
  Springer Japan
• スキャナを用いた海草・アマモの根の動態解析
  福澤 加里部; 仲岡 雅裕; 中路 達郎; 林 奈津美, 根の研究 = Root research, 22, 1, 47, 47, 20 Mar. 2013
  Japanese
• ILTER and JaLTER: Their Missions and Linkage to Database Development in the Asia-Pacific Region
  Nobuhito Ohte; Masahiro Nakaoka; Hideaki Shibata, The Biodiversity Observation Network in the Asia-Pacific Region, 205, 2012, [Peer-reviewed]
  Springer Japan
• 生態系の保全と地球環境
  生態学入門 第2版, 2012
• 藻場
  海洋保全生態学, 2012
• 北海道厚岸湖におけるアマモ場の空間分布と生物多様性
  渡辺健太郎; 東条斉興; 堀正和; 田中義幸; 鎌内宏光; WHANPETCH Napakhwan; 山田勝雅; REYNOLDS Laura K.; 百田恭輔; 仲岡雅裕, 日本生態学会大会講演要旨集, 58th, 2011
• エコロジー講座４ 地球環境問題に挑む生態学
  文一総合出版, 2011
• 地球環境変動と生態系サービス、人間活動の関連性の解明に向けて
  水産学シリーズ 169 浅海域の生態系サービス. 海の恵みと持続的利用, 2011, [Peer-reviewed]
• Seed dispersal supporting areal expansion of meadow in the seagrass, Zostera marina L.
  細川真也; 仲岡雅裕; 三好英一; 桑江朝比呂, 港湾空港技術研究所報告, 49, 3, 31-33,35-49, 49, Sep. 2010
  港湾空港技術研究所, Japanese
• 海草藻場における小型無脊椎動物群集の機能的冗長性:種多様性と機能群多様性の関係
  山田勝雅; 堀正和; 仲岡雅裕; 浜口昌巳, 日本生態学会大会講演要旨集, 57th, 2010
• アマモ場の生物多様性と機能
  仲岡雅裕, エコロジー講座３ なぜ地球の生きものを守るのか, 2010
  文一総合出版
• JaLTERの動向とモニタリングサイト1000森林分野との協力体制
  村岡裕由; 日浦勉; 柴田英昭; 仲岡雅裕; 三枝信子; 奈佐原顕郎, 日本陸水学会大会講演要旨集, 74th, 25, 3, 10 Sep. 2009
  日本陸水学会, Japanese
• 海草藻場の小型動物群集における種数-機能群構造関係の空間変異
  山田勝雅; 堀正和; 恵良拓哉; 仲岡雅裕, 日本生態学会大会講演要旨集, 56th, 2009
• 三陸沿岸の海草藻場におけるメソ・局所スケールの環境要因と小型無脊椎動物の群集構造の関係
  山田勝雅; 仲岡雅裕; 田中義幸; 堀正和; 浜口昌巳; 首藤宏幸, 日本ベントス学会・日本プランクトン学会合同大会講演要旨集, 2009, 2009
• アマモ場における魚類と小型無脊椎動物の群集構造の関係
  山田勝雅; 堀正和; 田中義幸; 長谷川夏樹; 仲岡雅裕, 日本ベントス学会・日本プランクトン学会合同大会講演要旨集, 2008, 2008
• 気候変動にともなう沿岸生態系の変化—生物群集から考える.
  仲岡雅裕, シリーズ群集生態学４ 生態系と群集をむすぶ, 179, 204, 2008, [Peer-reviewed]
  京都大学学術出版会
• 生物群集と生態系をむすぶ
  シリーズ群集生態学４ 生態系と群集をむすぶ, 2008, [Peer-reviewed]
• 3つの多様度指数:海草藻場の生態系機能の指標となるのはどれか?
  山田勝雅; 堀正和; 田中義幸; 長谷川夏樹; 仲岡雅裕, 日本生態学会大会講演要旨集, 54th, 2007
• 北海道厚岸湖・厚岸湾の海草藻場に形成される塩分勾配に対する一次消費者の群集構造の時空間的変動
  山田勝雅; 堀正和; 田中義幸; 長谷川夏樹; 仲岡雅裕, 日本ベントス学会・日本プランクトン学会合同大会講演要旨集, 2006, 2006
• 海草藻場の葉上動物群集の空間変異に対する地域的要因と局所的要因の相対的重要性
  恵良拓哉; 山田勝雅; 仲岡雅裕, 日本生態学会大会講演要旨集, 53rd, 2006
• 海草藻場の生物多様性
  三陸の海と生物―フィールドサイエンスの新しい展開, 2005
• Special feature: Multiple spatial scale approaches in population and community ecology - Preface
  M Nakaoka; T Noda, POPULATION ECOLOGY, 46, 2, 103, 104, Aug. 2004
  English, Others
• Effects of consumer diversity on ecosystem functioning of seagrass bed
  Yamada Katsumasa; Nakaoka Masahiro, Abstracts of the Annual Meeting of the Ecological Society of Japan, 51, 390, 390, 2004
  生物多様性と生態系機能の関係の一般的解明が生態学の主要課題として認識されている。従来の研究では種多様性を前者の指標とし、生物量、生産量、物質循環への効果、環境ストレスへの耐性、外来種の侵入のしやすさ等を後者の指標とした様々な実験・解析が行われてきた。その結果、多くの場合、種多様性と生態系機能の間には有意な正の相関がある事が示されている。この原因として、種多様性が高い群集ほど生態系への貢献度がより高い種が含まれること (サンプリング効果)、各種が生態系へ相補的に貢献すること(相補的効果)などが指摘されている。
  しかし、これらの研究のほとんどは生産者の種多様性のみを対象にしたものであり、より高次の栄養段階については研究例が少なく、その一般性は解明できていない。また、同じシステムであっても、生物多様性・生態系機能関係が環境勾配に伴い変化することも予想される。これらの研究課題の解明は人間活動によって生じる環境劣化に伴う生物多様性および生態系機能の変容をより正確に予測すると共に、それに対する有効な保全策を考える上でも非常に重要である。
  熱帯から亜寒帯域の沿岸に形成される海草藻場生態系は生物相が多様な生態系として知られる。主要な一次消費者は小型甲殻類や巻貝類などのメソグレーザーであり、海草上の付着藻類を摂餌することにより海草の生育に影響を与える事が知られる。これまで、海草藻場を含む海洋生態系の群集研究では、ひとつの栄養段階に属する消費者各種が有す生態系機能は同等と仮定され単一の機能群として扱う場合が多かった。しかし、海草の生育の変異がメソグレイザー間の機能的な差によって生じている可能性が近年指摘されている。メソグレーザーの生態系機能の種間変異やその相互作用に着目する研究は今後重要になると考えられる。
  本講演では種多様性と生態系機能の関係を扱った研究の中で特に消費者を対象とした研究例を紹介し、一次消費者の多様性が生態系機能に与える効果について総括と展望を行う。また、海草藻場をモデルとして演者らが進行中の研究について、その目的、方法、期待される成果について紹介する。, ECOLOGICAL SOCIETY OF JAPAN
• Impact and recovery of an intertidal ecosystem from the Nakhodka heavy-oil spill.
  Heavy Oil Spilled from Russian Tanker “Nakhodka “ in 1997: Toward Eco-responsibility,, 2003
• Seagrasses of Japan
  AIOI K., World Atlas of Seagrasses, 2003, [Peer-reviewed]
  Univ. California Press
• 個体群と生活史
  海洋ベントスの生態学, 2003, [Peer-reviewed]
• <その他>タチアマモZostera caulescensの個体群動態と生産性(北海道, 東北沿岸の海草藻場ワークショップ)(平成12年度共同利用研究集会講演要旨)
  仲岡 雅裕, 東京大学海洋研究所大槌臨海研究センター研究報告, 27, 61, 61, 29 Mar. 2002
  平成12年度共同利用研究集会「北海道, 東北沿岸の海草藻場ワークショップ」（2001年3月7日～9日, 研究代表者：相澤啓子）講演要旨Workshop of the studies on the seagrass beds in Hokkaido and Tohoku areas(Abstracts of scientific symposia held at Otsuchi Marine Research Center in 2000), 東京大学, Japanese
• タイ国トラン県国立公園における海草藻場とジュゴン ジュゴン生息に必要な藻場の広さ
  向井宏; 豊原哲彦; LEWMANOMONT K; SUPANWANID C; 仲岡雅裕; 相生啓子; 鈴木孝男; 松政正俊; 野島哲, 日本生態学会大会講演要旨集, 47th, 2000
• 群集多様性を創るメカニズム-ベントス群集のケース
  仲岡 雅裕; 松政 正俊, 日本プランクトン学会報, 44, 1, 37, 38, 31 Aug. 1997
  Japanese

• ブルーカーボン : 浅海におけるCO[2]隔離・貯留とその活用
  堀, 正和; 桑江, 朝比呂
  地人書館, Jun. 2017, 9784805209097, xii, 254p, 図版 [4] p, Japanese
• 海洋生態学
  日本生態学会; 津田, 敦; 森田, 健太郎; 仲岡, 雅裕; 齊藤, 宏明; 河村, 知彦; 鈴木, 光次; 山村, 織生; 高橋, 一生
  共立出版, Feb. 2016, 9784320057456, xi, 305p, 図版 [4] p, Japanese
• 水産学シリーズ 169 浅海域の生態系サービス. 海の恵みと持続的利用
  小路淳; 堀正和; 山下洋, 地球環境変動と生態系サービス、人間活動の関連性の解明に向けて
  恒星社厚生閣, 2011, 129-143
• エコロジー講座４ 地球環境問題に挑む生態学
  日本生態学会; 仲岡雅裕
  文一総合出版, 2011
• エコロジー講座３ なぜ地球の生きものを守るのか
  日本生態学会, アマモ場の生物多様性と機能
  文一総合出版, 2010, 6-17
• シリーズ群集生態学４ 生態系と群集をむすぶ
  大串隆之; 近藤倫生; 仲岡雅裕, 気候変動にともなう沿岸生態系の変化?生物群集から考える
  京都大学学術出版会, 2008, 179-204
• ジャングサウォッチハンドブック
  仲岡雅裕; 河内直子; 吉田正人; 大野正人; 小林愛
  日本自然保護協会, 2006, 36
• 流出油の海洋生態系への影響 −ナホトカ号の事例を中心に−
  大和田紘一; 小山次朗; 広石伸互, GISを用いた岩礁域潮間帯生物相に及ぼすナホトカ号重油流出事故の影響評価. 流出油の海洋生態系への影響
  恒星社厚生閣, 2005, 120-134
• 三陸の海と生物―フィールドサイエンスの新しい展開
  宮崎信之, 海草藻場の生物多様性
  サイエンティスト社, 2005, 66-83
• 海洋ベントスの生態学
  日本ベントス学会, 個体群と生活史
  東海大学出版会, 2003, 33-115

• 多様性生物学特論Ⅱ, 2024年, 修士課程, 環境科学
• 多様性生物学研究法, 2024年, 修士課程, 理学院
• 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
• 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
• ﾌｨｰﾙﾄﾞ科学特別実習Ⅰ, 2024年, 修士課程, 環境科学院
• ﾌｨｰﾙﾄﾞ科学特別実習Ⅱ, 2024年, 修士課程, 環境科学院
• 水圏科学特論Ⅰ, 2024年, 修士課程, 環境科学院
• 海洋生態学実習, 2024年, 学士課程, 理学部
• 海洋生態学実習, 2024年, 学士課程, 理学部
• 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
• 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
• 生物学特別実習Ⅰ, 2024年, 学士課程, 理学部
• 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
• 野外巡検, 2024年, 学士課程, 水産学部

• World Seagrass Association
• JAPAN GEOSCIENCE UNION
• THE SOCIETY OF POPULATION ECOLOGY
• THE JAPANESE ASSOCIATION OF BENTHOLOGY
• THE ECOLOGICAL SOCIETY OF JAPAN

• A 25-year empirical study of rocky intertidal habitats to assess ecosystem change and its predictability in the Anthropocene
  Grants-in-Aid for Scientific Research
  01 Apr. 2023 - 31 Mar. 2028
  野田 隆史; 岩崎 藍子; 和田 葉子; 深谷 肇一; 山田 勝雅; 仲岡 雅裕
  地球規模で環境変化が進行しつつある現在、生態系の変化を予測することは生態学に課せられた最大の課題である。本応募研究では生態系の数十年の変化の予測可能性を評価するための新たな研究フレームを提案し、これを岩礁潮間帯生態系に適用する。太平洋沿岸の6地域×5海岸×5岩礁の計150岩礁において、遷移区（人工裸地）とその対照区（無操作区）で集積した25年間の肉食者、植食者、固着動物、底生藻の4機能群の各種のアバンダンスデータを用いて様々な生態系属性を求める。得られた生態系属性とその安定性の約20年後の予測可能性を評価する。
  本年度は，遷移区の再設置とその対照区での野外調査を行った．太平洋沿岸の6地域（北海道東部，北海道南部，三陸，房総半島，南紀，大隅半島）の5海岸、各海岸の5岩礁の計150岩礁のうち，大隅の2海岸を除く海岸において，自然撹乱を模した遷移区（人工裸地）を再設置した．再設置した遷移区の設置時期（季節），設置方法，位置およびサイズは，最初に設置した2002年の時と完全に一致するように行った．また，対照区での野外調査は，これまでの長期センサスと全く同一の調査項目について例年同様に夏季に行った．
  加えて，すでに蓄積されている長期センサスデータを用いて予備解析を行った．北海道東部の21年間の岩礁潮間帯生物群集の主要機能群（底生藻類，固着動物，植食性動物，肉食性動物）を対象に地域スケールでの機能群アバンダンスと種アバンダンスについてトレンド解析を行った．その結果，機能群レベルでも種レベルでも，一部の対象において有意な時間傾向が検出された．
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23K27237
• A 25-year empirical study of rocky intertidal habitats to assess ecosystem change and its predictability in the Anthropocene
  Grants-in-Aid for Scientific Research
  01 Apr. 2023 - 31 Mar. 2028
  野田 隆史; 岩崎 藍子; 和田 葉子; 深谷 肇一; 山田 勝雅; 仲岡 雅裕
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23H02546
• Understanding migratory fishes in rivers and coasts
  Grants-in-Aid for Scientific Research
  01 Apr. 2023 - 31 Mar. 2027
  荒木 仁志; 峰岸 有紀; 仲岡 雅裕
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 23H00329
• Evaluation of Marine Biodiversity in Coastal Areas of Southeast Asia: Improving Precisions in Estimating Past Trajectory, Current Status and Future Forecast
  Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
  27 Oct. 2020 - 31 Mar. 2026
  仲岡 雅裕; 百田 恭輔; 諏訪 錬平; 山北 剛久
  本課題は生物多様性情報欠損海域である東南アジア沿岸海域を対象に、経済開発進展前（1970-2000）、現在（2010-2025）、将来（2040-2100）を通じた生物多様性の変化に関する広域かつ高解像度の復元・評価・予測を行うことを目的とする。特に、沿岸海域の中で多様な生態系サービスを提供しているマングローブ・海草藻場を対象とする。
  2021年度は、前年度に引き続きコロナ禍のため、予定していたタイでの全体会議、およびタイ・マレーシアでの現地調査が実施できなかったため、オンラインでの打ち合わせを継続して研究計画を練り直すとともに、文献やリモートセンシングデータなど現地に行かずに入手できる生物多様性情報を用いた解析を先行して進めた。
  東南アジアの熱帯性海草藻場については、今回の課題の対象国およびその周辺の国を含めた分布情報の集積を行い、それらをデータベース化してまとめるとともに、その解析を行い、海草藻場の分布、時間的変動および保全状態に関する状況を明らかにした（Sudo et al. 2021)。一方、マングローブと海草藻場の生物多様性が生態系機能を通じて地域住民に与える生態系サービスについてはフィリピンのブスアンガ島をモデル地域とした解析を行い、その脆弱性を評価した（Quiros et al. 2021)。後者についてはインドネシアその他についても解析を進めている。
  過去の生物多様性評価については、マングローブと海草藻場の過去の分布変化を解析できる航空写真が入手できる海域を選定し、その海域の航空写真の入手のための手続きを進めた。
  Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Hokkaido University, 20KK0246
• Overlooked process of land-ocean interactions: Quantitative evaluation on the impact of coastal landslide on marine ecosystems
  Grants-in-Aid for Scientific Research
  09 Jul. 2021 - 31 Mar. 2024
  仲岡 雅裕; 伊佐田 智規; 土井 一生
  北海道東部沿岸域を対象に、海岸地すべりによる土砂供給が沿岸生態系に与える影響の評価を行う。この目的を達成するため、(1)広域（10 kmスケール） の海域における沿岸生態系の定期調査、(2)地すべり発生後の生態系の変化の集中的な観測、(3)地すべり調査定点における連続的な観測、(4)上記の結果を取り入れた流動・生態系動態統合モデリングを組み合わせた研究を行う。観測結果を取り入れたモデルを用いたシミュレーションにより、陸源物質の河川を介した影響と地すべりによる土砂供給の直接的影響の相対的重要性を明らかにする。本研究で展開する生態学分野と地質学分野の異分野協働研究は、防災と生態系・生物多様性保全という社会的なニーズの高い課題を統合的に扱うことを通じて、新たな学問分野の創設につながることが期待される。
  初年度は、研究サイトの選定および研究方法の検討を進めた。研究サイトについては、厚岸湾内の仙鳳趾エリアに海岸地すべりの連続観測サイトを設けて、地すべり動態の観測を開始するとともに、バラサン岬～愛冠～アイニンカップのエリアにかけてもドローンによる定期観測サイトを設定して観測を開始した。ドローン撮影の手法についても検討を行い、海岸崖の周辺域を含む撮影エリアに対して異なる撮影角度で連続撮影をし、画像を合成することで海岸崖の変化および崖の下の透明度や藻類の繁茂状況を把握する方法を確定した。さらに、アイニンカップエリアにおいては、実際の海岸崖くずれに伴い変化した海底における海草類の分布の変化について観測を開始したところ、海底地形の変化に伴いオオアマモの分布が拡大するとともに種子繁殖にかかる形質の変化が生じていることも発見した。
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, 21K19854
• コーラル・トライアングルにおけるブルーカーボン生態系とその多面的サービスの包括的評価と保全戦略
  地球規模課題対応国際科学技術協力事業
  Apr. 2017 - Mar. 2022
  灘岡和夫
  JST-JICA, Competitive research funding
• 海洋「脱」酸性化：アマモ場の酸性化緩和機能の検証と生物群集・生態系機能変動予測
  科学研究費補助金 基盤研究（A）
  01 Apr. 2016 - 31 Mar. 2021
  仲岡雅裕
  Eelgrass beds absorb carbon dioxide through photosynthesis and thus have the ability to mitigate ocean acidification. In this study, we conducted an integrated analysis using coastal ocean observations, mesocosm experiments and ecosystem models to elucidate the magnitude of this function and to predict future changes. The results indicate that eelgrass beds have a significant influence on the spatiotemporal variation of pH and carbon dioxide partial pressure in the coastal ocean, and that they can locally mitigate the progression of ocean acidification in the coastal ocean even under future climate change, and can have a positive effect on the survival of calcareous organisms such as Pacific oyster.
  日本学術振興会, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 16H01792
• 海洋プラスチックごみに係る動態・環境影響の体系的解明と計測手法の高度化に係る研究
  環境研究総合推進費
  Apr. 2018 - Mar. 2021
  磯辺篤彦
  環境省, Competitive research funding
• 社会・生態システムの統合化による自然資本・生態系サービスの予測評価
  環境研究総合推進費
  Apr. 2016 - Mar. 2021
  武内和彦
  環境省, Competitive research funding
• Experimental examination of the impact of microplastic pollution on benthic organisms in coastal area
  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
  01 Apr. 2016 - 31 Mar. 2018
  NAKAOKA Masahiro; YORISUE Takefumi
  This study aimed to examine the effects of microplastic pollution on benthic invertebrate. Firstly, we measured microplastic density in the sediment of Akkeshi Bay, Hokkaido, and found that it is relatively lower compared to other reported sites, but that it is dominated by plastic fibers possibly derived from local fishery activities. Secondly, we examined the interactive effects of temperature rise and microplastic pollution on the mussel Mytilus trossulus and found that the negative effects of microplastics on feeding rate of mussel was amplificated with higher temperature. Finally, we obtained the evidence that the mussel intakes POPs (ersistent Organic Pollutants) through microplastic feeding. The obtained results highlighted that the significant impacts of microplastics on marine benthic invertebrates, which should further be investigated in future studies.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 16K14801
• Influences of forested Peridotite Basin on material flow and land-seashore vegetation
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  01 Apr. 2012 - 31 Mar. 2016
  SASA Kaichiro; FUKUZAWA Karibu; SATOH Fuyuki; AZUMA Takayuki; HOSHINO Yohichiro; YOYSUKURA Norishige; DENPOU Takashi; NAGASAKA Akiko; NAKAOKA Masahiro; SHIBATA Hideaki
  The purpose of this research is to clarify the influences of forested Peridotite basin on the water quality, material flow and seashore vegetation. Investigations were conducted by the method of comparing the Peridotite basin and the other than Peridotite basin.
  In the Peridotite basin, the quantitative ratio of run-off was high and run down through the surface of slope. And amount of DOC liquate out was large.Organic(DOC)-inorganic(Fe) complex were flow out from the bottom of O- layer of the soil, under the coniferous forest, mainly in autumn season. Fewer SS(Suspended Sediment ) were run-off and ratio of fallen leaves run-off was high. It was concluded that water environment and vegetation at the seashore area were conserved by forested Peridotite basin. But, on the other side, following situation was grasped that Kelp vegetation areas are decreasing by the effects of environmental deteriorations.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24380074
• Spatial variation in ecosystem functioning and services from eelgrass beds
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  01 Apr. 2012 - 31 Mar. 2016
  HORI Masakazu; SHOJI Jun; NAKAOKA Masahiro; HASEGAWA Natsuki
  This study aimed to clarify the factors causing spatial variation in ecosystem functioning and ecosystem services of eelgrass meadows in the Pacific Rim. We compared and analyzed the ecosystem functioning and services of eelgrass beds among the sites in both Japanese coast and the West coast of North America where some coastal foundation species had been transported from Japan with Japanese oyster seedlings. The analyses showed not non-native species but oyster farming itself caused the shift in functional structure from grazing-dominant to filter-feeding dominant and that the fish biomass was also more abundant in the seagrass bed with pacific oyster reef. It has been known that original pacific oyster reef is often established adjacent to eelgrass beds and has trophic-facilitative interactions with seagrass beds. Our result suggests a possibility that the original interaction between oyster and seagrass may appear also in the recipient eelgrass bed with oyster farming.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Japan Fisheries Research and Education Agency, 24405012
• Evaluation of carbon storage process into marine sediment based on new optical technology: non-destructive measurement of belowground production and degradation of seagrass
  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
  2011 - 2012
  NAKAOKA Masahiro; FUKUZAWA Karibu; NAKAJI Tatsuro
  This project aims to establish a method for quantitatively estimating production and degradation rate of belowground parts of seagrass by adopting non-destructive optical measurement techniques developed in terrestrial ecosystem research. Firstly, an aquaculture experiment of eelgrass was conducted using indoor and outdoor aquaria to periodically monitor growth of rhizomes and roots using an optical scanner in non-destructive manner. It was revealed that the root biomass accounted ca. 3 % of a total biomass of eelgrass, but the whole belowground parts occupied 14% and contributed significantly as a sink of carbon in sediment. Secondarily, hyper spectral reflectance images of different-aged belowground parts of seagrass were captured at visible and near-infrared spectral region (446-894nm). The increase in age from 14-220 days reduced the reflectance of live fine roots mainly at visible spectral region. The dead seagrass parts showed low reflectance at whole spectral region. By developing the estimation model, root age and concentrations of carbon and nitrogen were predicted by the spectral reflectance at the error of 12-37% (rRMSE). In conclusion, it was shown that seagrass belowground production has clear seasonal cycle and contributes to blue carbon storage. It was firstly demonstrated that age of belowground parts, carbon and nitrogen balance can be determined non-destructively using spectral reflectance images.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 23657011
• Establishment of metacommunity approach toward conservation of coastal biological community in varying environment
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2009 - 2012
  NAKAOKA Masahiro; TANAKA Norio; HORI Masakazu; YOTSUKURA Norishige; MIYASHITA Kazushi; ISODA Yutaka; NODA Takashi; NADAOKA Kazuo; YAMAMOTO Tomoko; HAMAGUCHI Masami
  To provide scientific information for the conservation and management of coastal ecosystems and resources, the present study carried out an integrated approach to investigate structure and dynamics of coastal marine community and their changes in relation to global climate change such as temperature rise. We specially targeted on seagrass bed, rocky intertidal and kelp forest communities as model systems. We conducted broad-scale, long-term monitoring of these communities based on periodical census and the use of remote sensing and GIS analyses, statistical analyses on meta-community structure, genetic analyses based on molecular data, and field manipulative experiments. The results demonstrated that structures of coastal communities are affected by multiple factors that operate at different spatial scales, and that their dynamics can be unstable with ongoing climate change through modification of species interaction processes between producers and consumers.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 21241055
• Assessment and conservation strategy for coastal ecosystem of coral triangle areas under multiple and high environmental loads
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2009 - 2011
  NADAOKA Kazuo; NAKAOKA Masahiro; LIAN Chunlan; WATANABE Atsushi
  For reef ecosystems in coral triangle areas, which have high bio-diversity but have been heavily deteriorated due to various environmental loads, we have developed' atmosphere-land-coastal-ocean' coupling model for physical and water cycle processes, land-based environmental load model and primary ecosystem ocean model including carbonate system dynamics model. We have also made population genetics analyses and larval dispersal simulations for clarifying reef connectivity. With all these models and analyses, we couldprovide a scientific scheme for contributing coastal ecosystem conservation and restoration in the coral triangle areas.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tokyo Institute of Technology, 21254002
• Impact assessment of soft-bottom disturbance in tropical seagrass meadows : interactive effects of tsunami and local environmental changes
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  2007 - 2010
  NAKAOKA Masahiro; MIYAJIMA Toshihiro; KOMATSU Teruhisa; SUZUKI Takao; MATSUMASA Masatoshi; YAMANO Hiroya; HORI Masakazu; TANAKA Yoshiyuki; ARYUTHAKA Chittima; SUPANWANID Chatcharee; MONTHOM Yaowaluk
  This project aims to examine the interactive effects of catastrophic disturbance caused by the tsunami, and local environmental modification on tropical seagrass communities in Thailand. Integrative approaches revealed the long-term, broad-scale dynamics of seagrass ecosystem before and after the tsunami in December 2004. The tsunami impacts varied greatly within a region, suggesting that other sources of disturbances, such as those by monsoon, river input and burrowing activities of benthic organisms deeply involved for the observed ecological dynamics.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), 19405009
• Establishment of conservation guideline for coastal foundationspecies by an integrated approach using spatial dynamics analyses and molecular ecology
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2006 - 2008
  NAKAOKA Masahiro; KAJIATA Tadashi; TANAKA Norio; NODA Takashi; NADAOKA Kazuo; KONDOH Akihiko; KUMAGAI Naoki; SHIMABUKURO Hiromori
  沿岸生態系の諸機能(生産性、安定性、物質循環など)に多大な影響を与える海草やマングローブなどの優占種(景観形成種)を対象に、生態学、分子生物学、海洋工学、地理情報学の各分野の最先端の理論・方法論・技術を統合的に利用することにより、メタ個体群の広域変動様式および変動機構の一般性、特異性を解明し、主要個体群の生物学的情報、生活史・分散特性に応じた保全指針の作成を行った。
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), 18201043
• Degradation mechanism on coastal ecosystems in shallow water as open multi-coupling systems and their conservation strategy
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2005 - 2007
  NADAOKA Kazuo; KAYANE Hajime; NAKAOKA Masahiro; HAMAGUCHI Masami; MIYAZAWA Yasumasa
  1) Conducting field surveys in the fringing reef of the east coast of Ishigaki Island, we found characteristic features of advective diffusion process of red-silt and spatio-temporal variations of nutrients and phytoplankton. 2) Based on the results of field surveys and numerical simulations for the Shiraho reef of Ishigaki Island, we found the formation mechanism of coral slicks around the reef, and the release timing and density distributions in the water column of blue coral (Heliopora coerulea) larvae and their dependence on the tidal phase. 3) We developed a numerical 3-D current model incorporated with a coral canopy layer model and thereby found that the coral larvae may retain longer in the reef when released around neap tide. 4) We conducted long-term continuous measurements of terrestrial environmental loads from the Todoroki watershed adjacent to the above mentioned reef and developed a basic model for evaluating the land-based environmental discharge. 5) Developing microsatellite markers and conducting genetic population analyses of crown-of-thorns starfish specimens taken from 23 sites in the Indo-Pacific regions including the Ryukyu Islands, we found that the gene flows are strongly governed by the magnitude of the ocean currents in the area concerned. With the numerical simulations of larval dispersal around the Kuroshio area, we reproduced the asymmetrical dispersal process along the area covering the Philippines, the Ryukyu Islands, Kyushu, Shikoku and Kii Peninsula, and clarified also with genetic population analyses that the Kuroshio may induce the secondary outbreaks. 6) We have indicated that coral cores may provide environmental fluctuation information over the past thousands years with the time resolution of 100 years, mangrove clay cores may provide information over the past 100 years with several years resolution, and coral annual rings may provide information of environments and terrestrial runoff in the past 100 years with 1 month resolution.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tokyo Institute of Technology, 17206052
• Evaluation of ecosystem function of coastal areas based on biodiversity of tropical seagrass beds
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  2004 - 2006
  NAKAOKA Masahiko; KONDOH Akihiko; KOMATSU Teruhisa; MIYAJIMA Toshihiro; MATSUMASA Masatoshi; SUZUKI Takao
  The main objective of the project is to establish evaluation methods of status and functions of tropical seagrass beds based on measurements of biodiversity. To achieve this goal, we conducted following research subjects during the period between April 2004 and March 2007. 1) Large-scale comparisons of major seagrass beds along the coast under different impacts of human activities, and 2) long-term monitoring and experimental analyses on the relationships between environmental factors, species diversity and ecosystem functioning of the seagrass beds. Based on our fieldwork, we found that major physical and chemical processes influencing biodiversity and ecosystem functioning of seagrass beds vary greatly among sites with different impacts of human activities. Especially, material input from river discharge greatly affects matter and energy flows in seagrass ecosystems. We found that biodiversity measured by various indices are correlated with variables representing functions of seagrass ecosystems, i.e., biomass, productivity, resistance to disturbance and resilience from disturbance. Based on this, we establish the evaluation methods of seagrass functional status based on observations of biochemical processes of seagrasses and biodiversity of seagrasses and associated biota.
  Some of our research sites were severely affected by the tsunami that hit the coastal areas of the Indian Ocean on Dec. 26th, 2004. The tsunami was the source of catastrophic disturbance to coastal ecosystems and human societies along southeastern Asian shores. Because we monitored abundance and biomass of seagrass and its associated animal community before the arrival of the tsunami-affected sites, this has given us a rare opportunity to quantitatively evaluate the effects of the tsunami disturbance on the biodiversity and ecosystem functioning of seagrass beds by taking the data using the same method after the tsunami. We found that the tsunami impacts on benthic organisms varied with and without seagrass vegetation, and that the degree of temporal changes in assemblage structure was not necessarily related to the magnitude of the tsunami disturbance.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chiba University, 16405007
• Spatial-scale dependency in diversity of biological community and its determination mechanisms : A broad-scale comparative experiment at rocky intertidal shore
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  2002 - 2005
  NAKAOKA Masahiro; NODA Takashi; YAMAMOTO Tomoko
  This study aims to examine the effects of spatial scale on structure, dynamics and diversity of biological communities using rocky intertidal communities as a model system. We established a total of 150 census plots along the Pacific coast of Japan according to nested hierarchical sampling design, and conducted census of community, experiment on succession and monitoring of environmental conditions. Major findings are summarized as follows :
  1.We found clear latitudinal gradients of regional species richness and species turnover among shores. However, these patterns were not reflected at a smaller-scale. On the other hand, there was no evidence of latitudinal clines in Simpson's diversity index in regional diversity or in its spatial components. These results suggest that relative abundance of common species does not vary along latitude, while the number of rare species increases with decreasing latitude.
  2.We analyzed how similarities of rocky intertidal assemblages vary at different spatial scales. The assemblages were categorized into distinct regional groups except for the two southern regions, whereas they did not separate clearly from each shore. Similarity was negatively correlated with geographic distance at the regional level, but not at the shore and the rock levels. The analyses highlighted the importance of broad-scale abiotic/biotic factors in determining observed patterns in similarity of rocky intertidal assemblages.
  3.We determined habitat specificity, abundance, and geographic range for algal species, and classified them into the 'seven forms of rarity' using Rabinowitz's classification scheme. The largest category was the category of rarity with "large geographic range, broad habitat specificity and low local density". The number and proportion of the rare species were positively correlated with algal species richness at shore level, suggesting that shore-level algal species richness can be s useful yardstick for deciding conservation areas.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chiba University, 14340242
• Development of a three-dimensional mapping system of biota and environment on the sea bottom with acoustics
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2000 - 2002
  KOMATSU Teruhisa; NAKAOKA Masahiro; TAIRA Asahiko; SUGIMOTO Takashige; TATSUKAWA Kenichi
  This study aimed to develop portable and small-size three-dimensional mapping system of marine organisms and environment on the sea bottom. The developed system can map precise coastal bottom topography acquiring accurate ship position, measuring bottom depths, substrate and distribution of benthic organisms such as seagrass with multibeam sonar, displaying bottom profile in real time. Since echosounders scan bottom depth with only short swath width, bottom topography must be interpolated between transects because of wide interval. It can sound three-dimensional form of bottom surface in aide of the multibeam sonar with wide swath width without interpolation classifying bottom substrate and measuring biomass of seagrass/seaweeds as a remote sensing system. The system also localizes not only the ship position but also bottom positions of ultrasound beams on the bottom by using accurate D-GPS, gyrocompass and motion sensor. We developed method mapping bottom topography and substrate by processing data with GIS. Field researches were conducted around Otsuchi Bay, Aburatsubo Bay and seamount in southern Tunisia. Since the research in Otsuchi Bay targeted seagrass beds, we made studies on ecology and biomass of seagrass as a sea truth survey. Before development of mapping software, we made researches on change in intertidal ecosystem polluted by the Nakhodka oil spill accident, and management and conservation of coastal areas as a research for GIS applying to studies on fisheries and oceanography. Conventional methods to measure bottom substrate and biomass of benthic organisms on the sea bottom are diving along a line transect or core sampling that are not efficient. It was verified that the developed system could map precisely bottom environment on the sea bottom surface with ecosystems varying in a horizontal scale of 1 to 100 m. The system contributes to not only scientific but also social domains for practice of coastal zone management.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 12358008
• CONSERVATION OF TROPICAL SEAGRASS BEDS WITH SPECIAL REFERENCE TO THEIR ROLE ON FUNCTION OF COASTAL ECOSYSTEM
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  2000 - 2002
  KOIKE Isao; MKAI Hiroshi; MOJIMA Satoshi; IIZUMI Hitoshi; KOGURE Kazuhiro; NAKAOKA Masahiro
  Field studies were conducted under the title "Conservation of tropical seagrass beds with special reference to their role on function of coastal ecosystem" to quantify the stress of terrestrial nutrients, sediment materials and human changes of coastal line on seagrass ecosystem including benthic populations facing to the Andaman Sea side of Thailand. Followings are major research outcomes of this project.
  1) We analyzed how the dominated species of seagrass adapts to external environmental change such as sediment supply and decrease of light intensity. And we indicated the importance of morphological adaptation of seagrasses including the fine roots of vertical rhizomes, as well as adjustment of photosynthetic products distribution among upper and below bottom.
  2) Stable isotope ratios of nitrogen, carbon and sulfur within the various parts of seagrasses could be used as a good indicator of small scale environmental stress. on seagrass metabolisms
  3) Comparison of species diversity and biomass distributing different environmental setting, from the location of big river mouth to that of no river inflow influence, indicated that both biomass and species diversity of seagrass decreased with the increase of river influences at least in this study area.
  4) Based on the field observations of physical forcing causing re-suspension of seagrass sediments, we identified three factors, i.e., tidal current, wind induced re-suspension and inflow or terrestrial solids. Even within the rather narrow area of seagrass beds, spatial and temporal variation of these three factors were observed, also effecting on metabolisms of benthic organisms associated with seagrass beds,
  5) Food preference of dugong for different types of seagrass species was examined and importance of Halophila beds for the diet of dugong of this area.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 12575032
• 陸と海との相互作用―陸上生態系の人為的改変と沿岸生態系の応答―
  科学研究費助成事業 基盤研究(C)
  2001 - 2001
  小池 勲夫; 小松 輝久; 柳 哲雄; 向井 宏; 仲岡 雅裕; 茅根 創
  本研究では、わが国の環境問題を理解する上で極めて重要な課題でありながらこれまで殆ど研究の行われていなかった陸域と沿岸域の相互作用について総合的に研究するため、研究グループの組織および各研究グループでの研究手法のすり合わせ、および具体的な研究フィールドの選択について調査を行い、「特定研究領域」として申請するための準備を行った。具体的には平成13年8月に関連研究者により研究フィールド選定のための視察を北海道の厚岸周辺で行うとともに、研究計画立案のための打ち合わせ会議を北大厚岸臨海実験所で開いた。さらに同年10月に具体的な研究計画を詰めるための会合を東大海洋研究所で開き、さらに、本研究領域参加メンバーが主体となった公開シンポジウム森と海の相互作用(東京大学海洋研究所共同利用シンポジュム 平成13年10月4-5日)を開催し、研究者および一般市民を対象にこの問題全般においてのこれまでの取り組みの成果および今後の研究指針についての論議を行った。このような準備段階を経て特定領域研究申請書海と陸の相互作用に関する研究--地域・海域環境の総合的な理解を目指して--が本研究課題代表者によって作成され提出することが出来た。本研究は陸上生態系と沿岸生態系の相互作用を、1)これまで予察的な研究が進んでいるわが国の2つの水系による中核拠点観測・研究、2)全国の森林、河川、沿岸データを集積・補強して陸上生態系との利用形態と沿岸との比較研究、3)大都市域の流域で自然科学と社会科学との共同研究で自然環境とと人間活動との共生を目指す研究を3つの柱として行う。この領域研究全体に共通する視点は、河川の集水域とその沿岸域を1つのユニットとし「集水域大生態系」と考えて研究を実施する点である。又、物質のユニット内での輸送は1)物理プロセス、2)生物プロセスの2つに分離してその特性を解析する予定である。
  日本学術振興会, 基盤研究(C), 東京大学, 13898014
• 海草混合群落の空間構造の変動に対する栄養成長と種子繁殖の相対的重要性の解明
  科学研究費助成事業 奨励研究(A)
  1999 - 2000
  仲岡 雅裕
  本研究では、海草藻場の空間構造の変動に対する海草の栄養成長と種子繁殖の効果を、定量調査、野外実験およびモデル解析により明らかにすることを目的とする。本年度は下記の項目について成果が得られた。
  1:海草藻場の空間構造と動態の定量的解明:前年度に設置した岩手県大槌湾・船越湾の海草藻場調査域において、主要構成種であるアマモとタチアマモの動態を解析した結果、種子生産量、種子埋土量および実生の発芽率はアマモの方が高いことが判明した。これは、撹乱により生じたギャップにアマモが先に侵入しやすいことを示するが、海草藻場の追跡調査によってもこの点が確認された。また、栄養生長については、光資源の少ない深い水深帯に生育するタチアマモが、浅い水深帯のアマモと同等の一次生産量を持つことが明らかになった。
  2:種間相互作用に関する実験的解析:アマモとタチアマモの移植実験を行った結果、水深帯により種間相互作用の様式が異なることを示すデータが得られた。この変異には光・栄養塩・撹乱の各要因が複合的に関与していることが示唆された。また、植食性動物の効果について、種子食者であるタナイスの摂食量を室内実験で検討した結果、タチアマモに対する影響が強いことが確認され、前年度に示した両種の種子食害率の変異をもたらす要因が解明された。
  3:モデルによる海草藻場空間構造の動態解析:以上のデータに基づいて海草2種の動態をシミュレーションモデルにより解析したところ、空間構造および種子繁殖量の変異の効果を取り入れることにより、両種の共存する水深帯が拡大することが予想された。この結果は、実際の海草藻場における両種の分布と一致しており、両種の共存において、海草藻場の空間構造と、種による栄養成長と種子繁殖の相対的重要性の変異が重要であることが明らかになった。
  日本学術振興会, 奨励研究(A), 東京大学, 11740425
• 二枚貝とヒドロゾアの相互作用の可塑性に関する実験生態学的・個体群統計学的研究
  科学研究費助成事業 奨励研究(A)
  1997 - 1998
  仲岡 雅裕
  本研究は、付着性のヒドロ虫類(カタテニンギョウ)と宿主である二枚貝キララガイについて、両種の相互作用の経時的変化を定量的に評価することを目的とする。今年度の成果は下記の通りである。
  1、 野外調査:岩手県大槌湾でキララガイの採集を行い、カタテニンギョウの付着率を計測した。今年度はキララガイの新規加入がなかったため、キララガイの平均サイズは増加した。これに伴いカタテニンギョウの付着率も減少した。この結果は、前年度確認されたカタテニンギョウのサイズ依存的付着率からの予測と一致した。
  2、 野外実験:春季にキララガイを標識後埋設し、カタテニンギョウの有無による生長量、生存率の変異を検定した。その結果、カタテニンギョウの有無に伴うキララガイの成長量、生存率に有意な差は見られなかった。この結果は前年度行った夏季、秋季の結果と同じであり、両種の相互作用に著しい季節変異がないことを示している。
  3、 室内実験:キララガイの捕食者である十脚類数種には、カタテニンギョウの付着の有無に伴うキララガイへの攻撃率に変異は検出されかった。
  4、 個体群統計解析:上記で得られたデータを用い、以下の解析を行った。
  (1), キララガイの加入の変動がカタテニンギョウ群集に与える影響:確率論的行列モデルを用いた解析では、キララガイの新規加入の経年変動が大きいほど、両種の共存条件が厳しくなることが判明した。これは前年度解析した決定論的モデルの予測とは異なった。
  (2), カタテニンギョウがキララガイに与える影響:行列モデルによる解析の結果、カタテニンギョウが付着したキララガイの適応度の減少は1%以下であった。両者の相互作用は、カタテニンギョウの片利共生と結論された。
  日本学術振興会, 奨励研究(A), 東京大学, 09740577
• Analysis of the structure of seagrass beds of Zostera caulescens and associating phytal communities in Funakoshi Bay.
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
  1996 - 1998
  AIOI Keiko; KOMATSU Teruhisa; NAKAOKA Masahiro
  Five temperate seagrass species occur along the coasts of nothern part of Honshu Island. Zostera marina is a cosmopolitan species in the Pacific and Atlantic Oceans of northern hemisphere. Besides Z.marina, Zostera caulescens, Zostera caespitosa, Zostera japonica and Phyllospadix iwatensis, a rocky shore phanerogamm, distribute in Otsuchi Bay, Funakoshi Bay and Yamada Bay in Iwate Prefecture locating along Rias Coast of Sanriku Area. It is considered that species diversity and endemism of seagrasses along the coasts of Iwate Prefecture are greately affected by the ocean currents, such as the Kuroshio Current, the Oyashio Current and the Tsugaru Warm Current as well as topographic environments of Rias coasts.
  The survey on the seagrasses in Funakoshi Bay was conducted to analize the distribution of seagrass species and ecological informations such as differences of morphology with the world's longest seagrass (Z.caulescens), biomass, natural histories. Analysis of environmental factors is important and logging of data are needed to analize the diversifying seagrass beds in different habitats. Phytal communities (gastropods) were also investigated.
  We are now collecting data for above mentioned study subjects. To describe the distribution area of seagrasses an echo sounding system was used. Biomass structures of Z.marina and Z.caulescens were obtained and the additional study of morphology of rhizome system of Z.caespitosa was studied in Yamada Bay. To know an important factor for phtosynthesis of seagrasses, phonton flux was measured. It is considered that the longest seagrass occurs in the cold water condition through the year and the distribution of Z.caulescens was recognized in the bottom of 16 m deep.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), The University of Tokyo, 08680594
• 海草群落に生息する葉上藻食性巻貝と海草の相互作用に関する実験生態学的研究
  科学研究費助成事業 奨励研究(A)
  1996 - 1996
  仲岡 雅裕
  本研究では野外調査および実験により、海草類と葉上藻食性巻貝類の相互関係について、以下の新たな知見が得られた。
  1.藻食性巻貝の個体数変動の要因について:
  調査地である岩手県大槌湾および船越湾の海草葉上巻貝の中の優占種であるアコヤシタダミとコムラサキバイ2種に注目し、海草2種(アマモとタチアマモ)の葉上における季節変動と基質間変異を調査した。その結果、(1)巻貝両種とも海草の現存量および水温が最大になる夏に、新規加入に伴い個体数が増加し、夏から秋にかけて個体数が減少すること、(2)アコヤシタダミの密度は海草2種間で変異がないが、コムラサキバイではアマモ葉上のほうが密度が高いこと、が明らかになった。餌となる付着藻類は春から夏にかけて急減することから、餌量が巻貝の個体数の減少要因になっていることが示唆された。室内実験の結果、(3)巻貝類には餌をめぐる種内・種間競争が存在し、これが、個体数の季節変動、基室間変異に大きな影響を与えていること、(4)巻貝の海草2種に対する選好性には変異がなく、従ってコムラサキバイに見られた基質間変異は、海草の質によるものではなく、海草2種の群落間の環境要因に存在していることが示された。また、野外実験の結果、(5)巻貝の個体数変異に海草の立体構造が有意な効果を与えている証拠は得られなかった。
  2.海草および付着藻類に対する藻食性巻貝の影響:
  野外調査および室内実験の結果、巻貝の密度は付着藻類の量に負の効果を与えるものの、海草自身の成長、現存量の変化に対する有意な効果は検出できなかった。これらのデータを利用して求めた数理モデルは広い密度領域での3者の共存を予測した。室内実験は夏にのみ行われたため、今後は種間関係の季節的な変異を明らかにすることが必要と思われる。
  日本学術振興会, 奨励研究(A), 東京大学, 08740594