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Shingo Akita

Faculty of Fisheries Sciences　Marine Bioresource and Environmental Science　Interdisciplinary Sustainability StudiesAssociate Professor

Researcher basic information

■ Degree
  • 博士（海洋科学）, 東京海洋大学, Mar. 2018
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 80828195
ORCID IDJ-Global ID■ Research Keywords and Fields
Research Keyword
  • kelp
  • 磯焼け
  • 藻場
  • Ecklonia
  • 沿岸生態系
  • 海藻
  • 分類
  • 進化
Research Field
  • Life Science, Aquatic bioproduction science, 藻類生態学
■ Educational Organization

Career

■ Career
Career
  • Apr. 2026 - Present
    Hokkaido University, Faculty of Fisheries Sciences, Associate Professor
  • Nov. 2021 - Mar. 2026
    Hokkaido University, Faculty of Fisheries Sciences, Assistant Professor
  • Apr. 2020 - Oct. 2021
    Japan Society for the Promotion of Science, JSPS Fellowships for Young Scientists PD, Japan
  • Oct. 2018 - Mar. 2020
    Kobe University, Research Center for Inland Seas, 学術研究員
  • Apr. 2018 - Sep. 2018
    Tokyo University of Marine Science and Technology, Marine Science, Post-doc fellow
  • Apr. 2015 - Mar. 2018
    Japan Society for the Promotion of Science, 特別研究員DC1, Japan
Educational Background
  • Apr. 2015 - Mar. 2018, Tokyo University of Marine Science and Technology, 海洋科学技術研究科, 応用生命科学専攻
  • Apr. 2013 - Mar. 2015, Tokyo University of Marine Science and Technology, 海洋科学技術研究科, 海洋生命科学専攻
  • Apr. 2009 - Mar. 2013, Tokyo University of Marine Science and Technology, 海洋科学部, 海洋生物資源
Committee Memberships
  • Jan. 2024 - Present
    Japanese Society of Phycology, Phycological Research, Associate Editor, Society
  • Apr. 2023 - Present
    Japanese Society of Phycologyo, Sorui associate editor, Society
  • Apr. 2024 - Mar. 2026
    日本水産学会, シンポジウム企画委員会 幹事

Research activity information

■ Awards
  • Mar. 2023, Japanese Society of Phycology, Prize for annual best paper
    Yoshino Hara;Yui Otake;Shingo Akita;Tomokazu Yamazaki;Fumio Takahashi;Shinya Yoshikawa;Satoshi Shimada
  • Dec. 2021, 国際藻類学会, Tyge Christensen Prize, 2020
    Molecular phylogeny and biogeography of Ecklonia spp. (Laminariales, Phaeophyceae) in Japan revealed taxonomic revision of E. kurome and E. stolonifera
    Shingo Akita;Kazuki Hashimoto;Takeaki Hanyuda;Hiroshi Kawai
  • Mar. 2021, 日本藻類学会, 日本藻類学会研究奨励賞
    秋田晋吾
  • Apr. 2013, 21st International Seaweed Symposium, UNIVERSITAS BAKRIE GRADUATE STUDENT POSTER AWARD, 2nd Prize
    Phenology of annual kelp Eckloniopsis forest on a Diadema barren in Uchiura Bay, Central Pacific Coast of Honshu, Japan
    Akita Shingo;Kobayashi Miki;Yamada Hirokazu;Ito Madoka;Fujita daisuke, International society
■ Papers
  • Technical note: Development of an extraction protocol and colorimetric analysis for alginate in marine sediment
    Sota Nakazato; Takashi Kawahara; Reiji Ichii; Shingo Akita; Akira Inoue; Masaki Fujita; Hideyuki Kurihara; Mitsuhiro Nakaya; Atsushi Ooki
    Biogeosciences, 23, 8, 2747, 2759, Copernicus GmbH, 21 Apr. 2026, [Peer-reviewed]
    English, Scientific journal, Abstract. In this study, we developed a novel extraction method for alginate, a major organic component derived from brown algae, in marine sediments and evaluated its applicability for quantitative analysis. Alginate analytical methods have been established in food chemistry: we modified these techniques to apply them to marine sediments, which are characterized by the cation composition (e.g., Ca, Mg, Fe) and humic substance-like high-molecular-weight organic compounds. By modifying the protocol through the addition of EDTA-2Na and the omission of ethanol precipitation, we improved the extraction efficiency of alginate from marine sediments, as demonstrated by spike recovery tests where recoveries of Na+-Alg significantly increased from 38.7 % with the conventional method to 64.7 %–82.6 %. Enzymatic degradation tests using alginate lyase confirmed that a portion of the extracted uronic acids from marine sediments (at least 34 %) was derived from alginate, verifying its presence in the natural samples. Using this modified method, alginate contents in sediment samples from coastal waters around Hokkaido, Japan, were quantified as 6.11–26.0 mg m−2 in Funka Bay, 39.0–41.3 mg m−2 in Hakodate Bay, 11.8–14.7 mg m−2 off Cape Esan, and 58.3–74.1 mg m−2 off Muroran. However, these values may be overestimated due to the presence of other uronic acids; therefore, they should be interpreted with caution rather than being directly equated with absolute alginate content.
  • A new species and first record of Riverina (Hildenbrandiales, Floridophyceae) from Mauritius: R. vaughanii sp. nov
    Futa Yao; Christophe Vieira; Sota Minamiguchi; Naoki Tojo; Nadeem Nazurally; Shingo Akita
    Phycologia, 03 Mar. 2026, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
    English, Scientific journal
  • Phenology of Sargassum fusiforme in its northernmost distribution limit in Japan
    南口 蒼太; 如澤 侑汰; 日吉 海斗; 水田 浩之; 宇治 利樹; 秋田 晋吾
    Japanese Journal of Phycology, 74, 1, 1, 8, Mar. 2026, [Peer-reviewed], [Last author, Corresponding author]
  • Lack of genetic support for varieties in Saccharina japonica (Laminariales, Phaeophyceae): Proposal for taxonomic merger
    Shingo Akita; Kenta Chizaki; Yuki Hosoyama; Chikara Kawagoe; Toshiki Uji; Daisuke Fujita; Christophe Vieira; Hiroyuki Mizuta
    Journal of Phycology, Feb. 2026, [Lead author, Corresponding author]
    English, Scientific journal, 46988525;37112849
  • Significant changes in seaweed community structure revealed by a nationwide long‐term monitoring survey in Japan ‘ Monitoring‐Site 1000 ’ over the past 15 years (2008–2022)
    Ryuta Terada; Takuzo Abe; Shingo Akita; Mitsunobu Kamiya; Hiroshi Kawai; Akira Kurashima; Chikako Nagasato; Yoshihiko Sakanishi; Hiromori Shimabukuro; Haruka Suzuki; Jiro Tanaka; Shinya Uwai; Yuki Watanabe; Ryoko Ueno; Misuzu Aoki
    Phycological Research, Wiley, 08 Dec. 2025, [Peer-reviewed]
    English, Scientific journal, SUMMARY

    Significant changes in seaweed communities were identified at six sites in Japan through the long‐term monitoring program ‘ Monitoring Sites 1000 .’ This study summarizes the results of 15 years of surveys conducted from 2008 to 2022. Annual nondestructive permanent quadrat observations and line‐transect surveys, carried out perpendicular to the shoreline, were used to assess species composition, coverage, and vertical distribution. Canopy‐forming seaweeds were present at all sites from 2008 to 2015; however, Ecklonia radicosa at the Satsuma‐Nagashima site on Kyushu, facing the open ocean, suddenly disappeared in 2016 and has not recovered since. As this species currently persists only in a nearby semi‐enclosed area, monitoring continues at both the disappeared and remaining locations. Similarly, Ecklonia cava and Eisenia bicyclis at the Shimoda site in central Honshu, facing the Pacific Ocean, gradually declined after 2018 and had completely disappeared by 2022. At the Shizugawa site on the Pacific coast of northern Honshu, the upward shift of Eisenia bicyclis communities to shallower depths—caused by seafloor subsidence following the 2011 earthquake—has persisted, with no recovery at the species' former deepest distribution. Saccharina japonica at the Muroran site in Hokkaido was abundant nearshore but showed considerable interannual variation offshore. At the remaining two sites, Takeno and Awaji‐Yura, located on the coasts of the Sea of Japan and the Pacific Ocean in central Honshu, respectively, Ecklonia and Sargassum communities appeared relatively stable. Nonetheless, shifts in canopy‐forming species were frequently observed, suggesting ongoing gap dynamics driven by community succession and episodic disturbances such as typhoons and heavy rainfall. Over the 15‐year period, canopy‐forming species disappeared from two of the six sites, apparently due to direct or indirect impacts of environmental change. Even at the other four sites, persistent communities were influenced by abiotic and biotic factors, underscoring the need for continued long‐term monitoring.
  • A taxonomic sudoku: Resolving the long‐standing puzzle of Japanese Dictyoteae (Dictyotales, Phaeophyceae) with new records and biogeographic insights
    Christophe Vieira; Shingo Akita; Masahiro Suzuki; Ryuta Terada; Takeaki Hanyuda; Satoshi Shimada; Shinya Uwai; Hiroshi Kawai
    Journal of Phycology, Wiley, 10 Oct. 2025, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, Abstract

    Japanese Dictyoteae have been documented since 1838, with a historical checklist of 21 names recorded prior to 1990. Persistent misidentifications—particularly of species originally described from Europe and the Americas—have complicated the taxonomy of the group in Japan. We reevaluated historical records and revised the national checklist for Canistrocarpus, Dictyota, Dilophus, and Rugulopteryx using integrated morpho‐genetic analyses. Broad sampling from Hokkaido to Okinawa, including Japanese type localities, together with sequence data from type localities of species described elsewhere but reported in Japan, corrected persistent taxonomic ambiguities. The long‐standing misapplication of the Asian D. dichotoma as D. spathulata was resolved. The revised checklist recognizes 19 species: 17 Dictyota, Canistrocarpus cervicornis, and Rugulopteryx okamurae. Species richness peaks in Kyushu with 15 species, whereas only D. spathulata extends to Hokkaido. Eight taxa appear native to the Northwest Pacific, including D. coriacea, D. haenyeosa, D. spathulata, D. spinulosa, D. sumbisoria, D. taewakia, Dictyota churaumia sp. nov., and R. okamurae. Twelve taxa exhibit broad, transoceanic distributions. We describe Dictyota churaumia sp. nov. and formally report nine species from Japan for the first time: Dictyota acutiloba, D. ceylanica, D. haenyeosa, D. humifusa, D. liturata, D. pfaffii, D. sandvicensis, D. sumbisoria, and D. taewakia. By integrating molecular data with morphological analyses, we resolved major taxonomic misidentifications and implemented the necessary taxonomic treatments (synonymies and typifications) to provide an updated taxonomic framework for the Dictyoteae flora of Japan. The presence of unique morphologies in historical herbarium specimens, coupled with unexplored regions of Japan, indicates a potential for additional, unidentified species., 43881958;46988525
  • Microsatellite DNA markers for paternity identification in the hermaphroditic barnacle Chthamalus challengeri Hoek
    Masami M. Tamechika; Yoichi Yusa; Shingo Akita; Masashi Sekino
    Molecular Biology Reports, 52, 1, Springer Science and Business Media LLC, 28 Aug. 2025, [Peer-reviewed]
    English, Scientific journal
  • First genetic evidence of interspecific hybridization in the genus Sargassum (Fucales, Phaeophyceae)
    Yuta Jozawa; Sota Minamiguchi; Kaito Hiyoshi; Kenta Chizaki; Chikara Kawagoe; Takahiro Arai; Tatsuya Ishikawa; Toshiki Uji; Hiroyuki Mizuta; Shingo Akita
    Phycological Research, 73, 161, 167, Jul. 2025, [Peer-reviewed], [Corresponding author], [International Magazine]
    Scientific journal, 46988525;27024356
  • Mycosporine-like amino acids from red alga Devaleraea inkyuleei harvested at two locations in southern Hokkaido
    Koki Takizawa; Hideki Kishimura; Shingo Akita; Yuya Kumagai
    Fisheries Science, Springer Science and Business Media LLC, 27 Jun. 2025, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Critical taxonomic revision of Korean Dictyoteae describing three new species and honoring Haenyeo culture
    Christophe Vieira; Jeong Chan Kang; Manon Daudinet; Shingo Akita; Myung Sook Kim
    Journal of Phycology, 05 Apr. 2025, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Genetic structure of Saccharina japonica in Japan and evaluation of a potential mitochondrial region for identification of geographic origin
    Kenta Chizaki; Chikara Kawagoe; Keiko Ito; Hiroyuki Mizuta; Yuya Yoshida; Toshiki Uji; Daisuke Fujita; Shingo Akita
    Journal of Applied Phycology, 37, 659, 672, Feb. 2025, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
    English, Scientific journal, 46988525;37112849
  • Concise review of the brown algal genus <i>Padina</i> (Dictyotaceae): knowledge in biodiversity, biogeography, potential and scope future research for Vietnam
    Linh Manh Nguyen; Shingo Akita; Luong Van Cao; Anh Thi Mai Nguyen; Quang Van Pham; Hung Manh Vu; The Duc Nguyen; Vy Xuan Nguyen; Quan Van Nguyen; Christophe Vieira
    Vietnam Journal of Marine Science and Technology, 24, 4, 399, 418, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), 10 Dec. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, The review critically examines the brown algal genus Padina (family Dictyotaceae), emphasizing its biodiversity, distribution, and potential applications, particularly in Vietnam. Globally, Padina species inhabit tropical and temperate coastal ecosystems, playing crucial ecological roles in primary production and as habitats for marine organisms. In Vietnam, nine species of Padina have been documented, yet their taxonomic diversity and applications remain underexplored. This synthesis highlights the morphological traits, ecological significance, and geographic distribution of Padina in Vietnam, with a focus on its potential in pharmaceuticals, nutraceuticals, cosmeceuticals, and bioremediation. Biochemical analyses reveal bioactive compounds such as terpenoids, polyphenols, and fucoidans, which demonstrate antioxidant, antimicrobial, and anti-inflammatory activities. These properties underscore Padina’s potential for natural product development in pharmaceutical and cosmetic industries. Despite this promise, research in Vietnam has predominantly centered on taxonomic and ecological aspects, with limited studies on biochemical and economic applications. The review identifies critical gaps in understanding species boundaries, phylogenetic relationships, and ecological roles. It advocates for advanced morphological and molecular studies, including molecular barcoding, to uncover cryptic diversity and resolve taxonomic ambiguities. Future research directions include exploring Padina’s reproductive biology, dispersal mechanisms, and responses to environmental stressors such as climate change. Additionally, investigations into its ecological roles, particularly as bioindicators of environmental health and agents for pollution mitigation, are essential. Addressing these gaps will enhance knowledge of Padina biodiversity and support the sustainable management and utilization of this valuable marine resource in Vietnam.
  • Evolutionary genomics of the emergence of brown algae as key components of coastal ecosystems
    France Denoeud; Olivier Godfroy; Corinne Cruaud; Svenja Heesch; Zofia Nehr; Nachida Tadrent; Arnaud Couloux; Loraine Brillet-Guéguen; Ludovic Delage; Dean Mckeown; Taizo Motomura; Duncan Sussfeld; Xiao Fan; Lisa Mazéas; Nicolas Terrapon; Josué Barrera-Redondo; Romy Petroll; Lauric Reynes; Seok-Wan Choi; Jihoon Jo; Kavitha Uthanumallian; Kenny Bogaert; Céline Duc; Pélagie Ratchinski; Agnieszka Lipinska; Benjamin Noel; Eleanor A. Murphy; Martin Lohr; Ananya Khatei; Pauline Hamon-Giraud; Christophe Vieira; Komlan Avia; Svea Sanja Akerfors; Shingo Akita; Yacine Badis; Tristan Barbeyron; Arnaud Belcour; Wahiba Berrabah; Samuel Blanquart; Ahlem Bouguerba-Collin; Trevor Bringloe; Rose Ann Cattolico; Alexandre Cormier; Helena Cruz de Carvalho; Romain Dallet; Olivier De Clerck; Ahmed Debit; Erwan Denis; Christophe Destombe; Erica Dinatale; Simon Dittami; Elodie Drula; Sylvain Faugeron; Jeanne Got; Louis Graf; Agnès Groisillier; Marie-Laure Guillemin; Lars Harms; William John Hatchett; Bernard Henrissat; Galice Hoarau; Chloé Jollivet; Alexander Jueterbock; Ehsan Kayal; Andrew H. Knoll; Kazuhiro Kogame; Arthur Le Bars; Catherine Leblanc; Line Le Gall; Ronja Ley; Xi Liu; Steven T. LoDuca; Pascal Jean Lopez; Philippe Lopez; Eric Manirakiza; Karine Massau; Stéphane Mauger; Laetitia Mest; Gurvan Michel; Catia Monteiro; Chikako Nagasato; Delphine Nègre; Eric Pelletier; Naomi Phillips; Philippe Potin; Stefan A. Rensing; Ellyn Rousselot; Sylvie Rousvoal; Declan Schroeder; Delphine Scornet; Anne Siegel; Leila Tirichine; Thierry Tonon; Klaus Valentin; Heroen Verbruggen; Florian Weinberger; Glen Wheeler; Hiroshi Kawai; Akira F. Peters; Hwan Su Yoon; Cécile Hervé; Naihao Ye; Eric Bapteste; Myriam Valero; Gabriel V. Markov; Erwan Corre; Susana M. Coelho; Patrick Wincker; Jean-Marc Aury; J. Mark Cock
    Cell, Elsevier BV, Nov. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    Scientific journal
  • Life cycle and molecular phylogeny of Vaucheria piloboloides (Vaucheriales, Xanthophyceae) from Sado Island, Japan
    Masakazu Hoshino; Satoru Tadokoro; Shingo Akita; Shinya Uwai
    Phycological Research, 72, 258, 265, Sep. 2024, [Peer-reviewed], [International Magazine]
    English
  • Of sea, rivers and symbiosis: Diversity, systematics, biogeography and evolution of the deeply diverging florideophycean order Hildenbrandiales (Rhodophyta)
    Christophe Vieira; Cody Brooks; Shingo Akita; Myung Sook Kim; Gary W. Saunders
    Molecular Phylogenetics and Evolution, 108106, 108106, Elsevier BV, May 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Epizoic macroalgae attached on shells of the horned turban Turbo sazae inhabiting Nakane Reef, Jogashima Island, Kanagawa Prefecture, Japan
    Ding Yuhao; Taku Yoshiyama; Shingo Akita; Daisuke Fujita
    Japan. Jpn. J. Phycol. (Sôrui), 71, 3, 157, 164, 10 Nov. 2023, [Peer-reviewed], [Corresponding author]
    Japanese, Scientific journal
  • Phenology of Codium cylindricum (Ulvophyceae, Bryopsidales) on the central Pacific coast of Japan
    Minoru Miyadai; Shingo Akita; Daisuke Fujita
    Botanica Marina, 65, 337, 345, 26 Oct. 2022, [Peer-reviewed], [Corresponding author]
    Scientific journal, 11993067
  • Gene expression of a canopy‐forming kelp, Eisenia bicyclis ( Laminariales, Phaeophyceae ), under high temperature stress
    Yoshino Hara; Yui Otake; Shingo Akita; Tomokazu Yamazaki; Fumio Takahashi; Shinya Yoshikawa; Satoshi Shimada
    Phycological Research, 70, 4, 203, 211, 13 Jul. 2022, [Peer-reviewed]
    Scientific journal
  • Phylogeography of a canopy‐forming kelp, Eisenia bicyclis (Laminariales, Phaeophyceae), based on a genome‐wide sequencing analysis
    Kanako Chimura; Shingo Akita; Takaya Iwasaki; Atsushi J. Nagano; Satoshi Shimada
    Journal of Phycology, 58, 2, 318, 329, Wiley, 09 Jan. 2022, [Peer-reviewed], [Corresponding author], [International Magazine]
    English, Scientific journal, Analyses of phylogeographic patterns and genetic diversity provide fundamental information for the management and conservation of species. However, little is published about these patterns in Japanese kelp species. In this study, we conducted phylogeographic analyses of a canopy-forming kelp, Eisenia bicyclis, based on genome-wide SNPs identified by ddRAD-seq. We obtained 1,299 SNPs for 76 samples from nine localities across the distribution. STRUCTURE, NeighborNet, and discriminant analysis of principal components consistently showed high genetic differentiation among the Eastern Pacific, Central Pacific, and Sea of Japan coastal regions. Relatively strong gene flow was detected only within populations in the Eastern Pacific and in the Sea of Japan. Genetic diversity and genetic uniqueness were high in the Central Pacific and low in the Sea of Japan. These results suggest that there were at least three independent refugia corresponding to the three regions during the Last Glacial Maximum (LGM). Furthermore, relatively larger populations in the Central Pacific and smaller populations in the Sea of Japan have been maintained in the demographic history from before the LGM to the present. These phylogeographic histories were supported by an Approximate Bayesian Computation analysis. From a conservation genetics perspective, the loss of southern populations in the Central Pacific would greatly reduce the total genetic diversity of the species. Southern populations in the Sea of Japan, which have relatively low genetic diversity, may be highly vulnerable to environmental change, such as heat waves and increased feeding. Therefore, careful monitoring and conservation are needed in the two regions.
  • Restoration of Ecklonia radicosa bed on a long-left concrete block dominated by Diadema sea urchins
    Shingo Akita; Hirokazu Yamada; Madoka Ito; Daisuke Fujita
    Algal Resources, 14, 2, 49, 58, Jan. 2022, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
    English
  • Providing a phylogenetic framework for trait-based analyses in brown algae: phylogenomic tree inferred from 32 nuclear protein-coding sequences
    Shingo Akita; Christophe Vieira; Takeaki Hanyuda; Florence Rousseau; Corinne Cruaud; Arnaud Couloux; Svenja Heesch; J. Mark Cock; Hiroshi Kawai
    Molecular Phylogenetics and Evolution, 168, 107408, 107408, Elsevier BV, Jan. 2022, [Peer-reviewed], [Lead author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • First record of the genus Hildenbrandia (Florideophyceae: Hildenbrandiales) from French Polynesia and description of H. tahitiensis sp. nov
    Christophe Vieira; Shingo Akita; Yi Sun Kim; Satoshi Shimada; Hiroshi Kawai; Mayalen Zubia
    Journal of Asia-Pacific Biodiversity, 14, 4, 607, 612, Elsevier BV, Jul. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Molecular evidence for naturally occurring intra- and inter-generic hybridization in the genus Ecklonia (Laminariales, Phaeophyceae)
    Shingo Akita; Keiichiro Koiwai; Tatsuya Ishikawa; Takashi Sakamoto; Taku Yoshimura; Setsuo Kiyomoto; Kaiji Nanri; You Tamayama-Kato; Akira Kurashima; Takeaki Hanyuda; Satoshi Shimada; Hiroshi Kawai; Daisuke Fujita
    Phycologia, 60, 2, 170, 179, 04 Mar. 2021, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Scientific journal, 27024358
  • Hildenbrandia (Hildenbrandiales, Florideophyceae) from Japan and taxonomic lumping of H. jigongshanensis and H. japananensis
    Christophe Vieira; Shingo Akita; Shinya Uwai; Takeaki Hanyuda; Satoshi Shimada; Hiroshi Kawai
    Phycological Research, 69, 3, 166, 170, Wiley, 17 Feb. 2021, [Peer-reviewed], [Corresponding author], [International Magazine]
    Scientific journal
  • Basic introduction of molecular phylogenetic analysis for applied phycologists
    Shingo Akita; Takeaki Hanyuda; Satoshi Shimada
    Algal resources, 13, 2, 27, 31, Dec. 2020, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese
  • ddRAD-seq based phytogeographic study of Gelidium elegant (Rhodophyceae) around Japanese coast
    Kanako Chimura; Takaya Iwasaki; Atushi Nagano; Shingo Akita; Satoshi Shimada
    Algal Resources, 20, 13, 117, 122, Dec. 2020, [Peer-reviewed]
    Japanese
  • Relationship between the amount of free amino acids and the salinity conditions in cultivation of two Neopyropia species (Rhodophyta)
    Saeri Seto; Shingo Akita; Takehiko Yokoyama; Norio Kikuchi; Satoshi Shimada
    Algal Resources, 13, 2, 103, 106, Dec. 2020, [Peer-reviewed]
    Japanese, Scientific journal
  • High-temperature tolerance of a brown alga Eisenia Bicyclist's collected from different localities
    Yui Otake; Satoshi Shimada; Shingo Akita
    Algal Resources, 13, 2, 85, 89, Dec. 2020, [Peer-reviewed]
    Japanese, Scientific journal
  • DNA metabarcoding analysis of macroalgal seed banks on shell surface of the limpet Niveotectura pallida
    Shingo Akita; Hiroki Murasawa; Mitsuki Kondo; Yoshihito Takano; Yoko Kawakami; Satoshi Nagai; Daisuke Fujita
    European Journal of Phycology, 55, 4, 467, 477, 01 Oct. 2020, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • The macroalgal culture collection in Kobe University (KU-MACC) and a comprehensive molecular phylogeny of macroalgae based on the culture strains
    Hiroshi Kawai; Takeaki Hanyuda; Shingo Akita; Shinya Uwai
    Applied Phycology, 1, 8, Informa UK Limited, 06 Aug. 2020, [Peer-reviewed]
    English, Scientific journal

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  • Phenology of the edible red alga Eucheuma serra (J. Agardh) J. Agardh in northern Taiwan
    Boryuan Chen; Yang Lu; Shingo Akita; Daisuke Fujita
    Aquaculture Science, 68, 2, 121, 128, Jul. 2020, [Peer-reviewed]
    English, Scientific journal
  • Molecular phylogeny and biogeography of Ecklonia spp. (Laminariales, Phaeophyceae) in Japan revealed taxonomic revision of E. kurome and E. stolonifera
    Shingo Akita; Kazuki Hashimoto; Takeaki Hanyuda; Hiroshi Kawai
    Phycologia, 59, 4, 330, 339, Informa UK Limited, 26 May 2020, [Peer-reviewed], [Lead author]
    Scientific journal
  • Variation in “bank of microscopic forms” in urchin barren coast: detection using DNA metabarcoding based on high-throughput sequencing
    Shingo Akita; Hiroki Murasawa; Yoshihito Takano; Yoko Kawakami; Daisuke Fujita; Satoshi Nagai
    Journal of Applied Phycology, Springer Science and Business Media {LLC}, 22 May 2020, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal
  • Finding of regeneration in a large number of wounded receptacles in Sargassum ringgoldianum (Phaeophyceae, Fucales)
    Shunro Yamano; Shingo Akita; Yuhi Hayakawa; Daisuke Fujita
    Phycological Research, 68, 2, 183, 186, Wiley, Apr. 2020, [Peer-reviewed], [Corresponding author]
    Scientific journal
  • A multigene molecular phylogeny of Eisenia reveals evidence for a new species, Eisenia nipponica (Laminariales), from Japan
    Kawai Hiroshi; Akita Shingo; Hashimoto Kazuki; Hanyuda Takeaki
    EUROPEAN JOURNAL OF PHYCOLOGY, 55, 2, 234, 241, Jan. 2020, [Peer-reviewed]
    English, Scientific journal
  • Rapid detection of macroalgal seed bank on cobbles: application of DNA metabarcoding using next-generation sequencing
    Shingo Akita; Yoshihito Takano; Satoshi Nagai; Hisami Kuwahara; Rumiko Kajihara; Akifumi S. Tanabe; Daisuke Fujita
    Journal of Applied Phycology, 31, 4, 2743, 2753, Springer Science and Business Media {LLC}, 12 Aug. 2019, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal
  • Is the red alga Meristotheca papulosa annual?―Monitoring of tagged thalli at Banda, Tateyama, Central Pacific coast of Japan―
    Boryuan Chen; Shingo Akita; Akita Uehara; Daisuke Fujita
    Aquaculture Science, 67, 1, 49‐56, Mar. 2019, [Peer-reviewed]
    English
  • Seasonal changes in taxon richness and abundance of mobile invertebrates inhabiting holdfast of annual kelp Ecklonia radicosa (Phaeophyceae, Lessoniaceae) at the central Pacific coast of Japan
    Shingo Akita; Hirokazu Yamada; Madoka Ito; Daisuke Fujita
    Phycological Research, 67, 51, 58, Wiley, Jan. 2019, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal
  • Development of 11 Ecklonia radicosa (Phaeophyceae, Laminariales) SSRs markers using next-generation sequencing and intra-genus amplification analysis
    Shingo Akita; Keiichiro Koiwai; Takeaki Hanyuda; Syou Kato; Reiko Nozaki; Tsubasa Uchino; Takashi Sakamoto; Hidehiro Kondo; Ikuo Hirono; Daisuke Fujita
    Journal of Applied Phycology, 30, 3, 2111, 2115, 01 Jun. 2018, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 27024358
  • Phenology of Chondracanthus tenellus (Rhodophyta) in the central Pacific coast of Honshu, Japan
    Yuhi Hayakawa; Kenta Kawata; Kazuma Machida; Shunro Yamano; Shingo Akita; Daisuke Fujita
    JOURNAL OF APPLIED PHYCOLOGY, 29, 5, 2547, 2556, Dec. 2017, [Peer-reviewed]
    English, Scientific journal
  • Use of fertilized molten slags to create Sargassum forests in subtropical shallow waters
    Daisuke Fujita; Rai Ma; Shingo Akita; Miki Kobayashi; Yuhi Hayakawa; Toshihiro Miyatani; Yuji Seki; Yasuhiro Yamahira
    JOURNAL OF APPLIED PHYCOLOGY, 29, 5, 2667, 2674, Dec. 2017, [Peer-reviewed]
    English, Scientific journal
  • Phlorotannin contents of Ecklonia radicosa in Hirasawa, Central Coast of Honshu, Japan : seasonal and within-thallus variations among four parts of thallus
    秋田 晋吾; 山田 博一; 伊藤 円; 藤田 大介
    藻類 = The Japanese journal of phycology, 65, 2, 91, 95, 日本藻類学会, Jul. 2017, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese
  • A New Marine Tube-Dwelling Diatom Parlibellus latirostris (Bacillariophyceae) from Japan (創刊100周年記念号)
    鈴木 秀和; 宮内 麻由美; 秋田 晋吾; 南雲 保; 田中 次郎
    植物研究雑誌 = The journal of Japanese botany, 91, 0, 355, 363, ツムラ, Dec. 2016, [Peer-reviewed]
    English
  • Sorus formation on the holdfast haptera of the kelp Ecklonia radicosa (Phaeophyceae, Laminariales)
    Shingo Akita; Hirokazu Yamada; Madoka Ito; Michael H. Graham; Daisuke Fujita
    BOTANICA MARINA, 59, 6, 433, 438, Dec. 2016, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • 磯焼け対策 静岡県のガンガゼ優占域におけるガラモ場の回復と拡大―瀬切りと中層網の利用―
    山田博一; 伊藤円; 秋田晋吾; 藤田大介
    月刊海洋, 47, 7, 323, 328, 01 Jul. 2015
    Japanese
  • Phenology of annual kelp Eckloniopsis (Phaeophyceae, Laminariales) forest on a Diadema barren in Uchiura Bay, Central Pacific Coast of Honshu, Japan
    Shingo Akita; Hirokazu Yamada; Madoka Ito; Miki Kobayashi; Daisuke Fujita
    JOURNAL OF APPLIED PHYCOLOGY, 26, 2, 1141, 1148, Apr. 2014, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Are there any top-down controls in Diadema barrens in the warm temperate Pacific coasts of Japan?
    Shingo Akita
    CAHIERS DE BIOLOGIE MARINE, 54, 4, 615, 624, 2013, [Peer-reviewed], [International Magazine]
    English, Scientific journal
■ Other Activities and Achievements
■ Lectures, oral presentations, etc.
■ Syllabus
  • Introduction to Fisheries Sciences Ⅰ（水産科学汎論Ⅰ）, 2024年, 修士課程, 水産科学院
  • 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
  • 海藻学, 2024年, 学士課程, 水産学部
  • 環境と人間, 2024年, 学士課程, 全学教育
  • 海洋生物科学実験Ⅱ, 2024年, 学士課程, 水産学部
  • 水圏生物学, 2024年, 学士課程, 水産学部
  • 海洋生物科学Ⅰ, 2024年, 学士課程, 水産学部
  • 海洋資源科学実験Ⅱ, 2024年, 学士課程, 水産学部
  • 水圏生物科学実習, 2024年, 学士課程, 水産学部
  • 水産資源各論, 2024年, 学士課程, 水産学部
  • 潜水調査実習, 2024年, 学士課程, 水産学部
  • 野外巡検, 2024年, 学士課程, 水産学部
■ Affiliated academic society
  • THE JAPANESE SOCIETY OF APPLIED PHYCOLOGY
  • THE JAPANESE SOCIETY OF PHYCOLOGY
  • 日本水産学会
■ Research Themes
  • 海藻マコンブ類の分類学的再検討および種内系統判定マーカーの開発
    科学研究費助成事業
    01 Apr. 2024 - 31 Mar. 2027
    秋田 晋吾
    日本学術振興会, 若手研究, 北海道大学, 24K17948
  • Study on genetic diversity and ecology for southern edge population of Saccharina japonica distributing Honshu
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Apr. 2022 - Mar. 2025
    藤田 大介・秋田晋吾
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Tokyo University of Marine Science and Technology, Coinvestigator, 22K05781
  • 海藻ヒジキの繁殖生態の解明：有性生殖と栄養繁殖の再生産への貢献度は？
    ミキモト海洋生態研究助成基金
    Aug. 2023 - Mar. 2024
    三井住友信託銀行, 北海道大学水産科学研究院, Principal investigator
  • Effect of genetic diversity on maintenance of macroalgal bed
    Grants-in-Aid for Scientific Research
    24 Apr. 2020 - 31 Mar. 2023
    秋田 晋吾
    今年度も感染症により臨海実験所の長期滞在による利用が制限されたため，実験室を主とした研究を進めることとした。前年度に単離し遺伝子型を決定したカジメの配偶体を使用して，掛け合わせる配偶体の個体数による配偶体の成熟率の違いを調べた。雄性配偶体1個体と雌性配偶体1個体と掛け合わせたものから雌雄の配偶体を4個体ずつにまで増やし，4つの実験区（♂1個体x ♀1個体，♂2個体x ♀2個体，♂3個体x ♀3個体，♂4個体x ♀4個体）を設けた。なお，実験には遺伝子型の異なる配偶体を使用し，成熟の有無については顕微鏡下で判断しやすい雌性配偶体の卵形成で評価した。雌雄の配偶体を混合した後，1週間後に卵形成の有無を各区30個体ずつ調べると，どの実験区においても卵を形成した雌性配偶体の割合は80%前後で，明確な差はないことがわかった。また，母藻による配偶体の生長速度についても調べるために，胞子体を6つ使用し，それぞれの配偶体の細胞数の変化を5日毎に計数した。その結果，どの胞子体に由来しても配偶体の細胞数は2から3個程度で，配偶体の生長速度についても親個体の違いがほとんど影響しないことがわかった。幼胞子体の生長を比較にむけて胞子体を培養している最中にあったが，就職に伴い本年度の半ばで特別研究員の資格を辞退することとなった。
    Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Ochanomizu University, 20J01345
  • 海藻ホンダワラの被食耐性：生殖器官の再生能力の解明
    Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
    01 Apr. 2020 - 31 Mar. 2023
    秋田 晋吾
    Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Kobe University, 20K15580
  • 遺伝子多様度が「海の森」の維持と形成に与える影響
    笹川科学研究助成金
    Apr. 2018 - Mar. 2019
    秋田 晋吾
    日本科学協会, Principal investigator, Competitive research funding
  • 遺伝子多様度解析を用いたアントクメ個体群消滅危険性の予測
    Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
    24 Apr. 2015 - 31 Mar. 2018
    秋田 晋吾
    本課題では，遺伝子多様度の高い個体群が環境変異や物理的撹乱に強いことに着目し，海藻類の個体群である藻場における遺伝子多様度を解明することで，磯焼けの発生リスクが高い個体群を検出できるか調べた。平成29年度は，平成27年度に採集した個体と平成28年度に開発したマイクロサテライトマーカーを用いて，1）集団遺伝解析および2）遺伝子多様度解析を行った。
    1）集団遺伝解析
    平成28年度に実施した系統地理解析の結果を検証するために，11個のマイクロサテライトマーカーを用いて集団遺伝解析を行った。その結果，アントクメの遺伝集団は九州西岸と太平洋岸の2グループ，もしくは，伊豆大島，平沢，仁科，早田浦，土佐清水，串木野，長島，野母崎，新三重および原島と嫦娥崎の10グループに分かれると推定された。この結果は前年度に実施した系統地理解析を支持し，各地の個体群は遺伝的に大きく離れており，本種の分散能力は低いことが示唆された。
    2）遺伝子多様度解析
    各地の個体群において，検出されたアレルの数（Na: 最小の個体群に補正），ヘテロ接合度の観察値（Ho）と期待値（He），近交係数（Fis）およびアレル共有度（Psaxy）を求めた。これらの指数のうち近交係数（Fis）は，嫦娥崎，原島，新三重，野母崎，串木野，土佐清水および仁科で低く，長島，早田浦，伊豆大島および平沢で高いことが確認された。各地の生育状況から，アントクメの個体群は，拡大（嫦娥崎，原島），安定（長島，早田浦，伊豆大島および平沢）および縮小（新三重，野母崎）の3段階に分けられ，Fisと比較すると，大きな変動を示す個体群でFisが低く，Fisは個体群の現状を示す指標となり得ることが示された。
    Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Tokyo University of Marine Science and Technology, 15J11734