Researcher basic information

• Ph. D, Hokkaido University

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

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901011831844175
• http://ok.fsc.hokudai.ac.jp/
• http://ok.fsc.hokudai.ac.jp/en/

• 200901011831844175

• アズマヒキガエル
• 外来種
• 誘導防御
• 表現型可塑性
• 誘導攻撃
• 間接効果
• 生態系機能
• 形態変化
• エゾサンショウウオ
• 適応
• 捕食
• 相互作用
• エゾアカガエル
• 両生類
• 栄養カスケード
• メソコスム
• 遺伝学
• 動物
• 生態学
• 個体群生態学
• 群集生態学
• 行動生態学
• 進化生態学
• Community Ecology
• Evolutionary Ecology

• Life Science, Ecology and environment

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

Research activity information

• 2009, 第13回 日本生態学会宮地賞
  Japan

• Ecological characteristics of Japanese eels in Hokkaido, the northern edge of their distribution
  Kanon Tokura; Kentaro Morita; Osamu Kishida; Kanta Muramatsu; Yusuke Kumai; Aya Takeuchi; Mayu Inokuchi; Mari Kuroki
  Ichthyological Research, Apr. 2026, [Peer-reviewed]
  Scientific journal
• A giant's appetite: how body size drives the diet and trophic position of the Japanese giant salamander
  Clément Duret; Benjamin Lejeune; Gilles Lepoint; Tiphanie Bartet; Sumio Okada; Keitaro Fukushima; Osamu Kishida; Mathieu Denoël
  Oikos, Jan. 2026, [Peer-reviewed]
  Scientific journal
• Costs of size increase prior to oceanic migration inferred from predation-caused wounds in an anadromous fish
  Ryo Futamura; Kentaro Morita; Jiro Uchida; Atsushi Okuda; Yoichiro Kanno; Osamu Kishida
  Journal of Ethology, Jan. 2026, [Peer-reviewed], [Last author]
  Scientific journal
• Thermal constraints on the distribution of Japanese eel (Anguilla japonica) at its northern limit: Links to land use and geology
  Kanta Muramatsu; Mari Kuroki; Yu-Lin K Chang; Kentaro Morita; Osamu Kishida
  PNAS Nexus, 01 Dec. 2025, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Adding color to spring: exuberant body color variation in brown frog tadpoles
  Hisanori Okamiya; Muku Tsujino; Tatsuro Nakaji; Osamu Kishida
  Current Zoology, Oxford University Press (OUP), 18 Nov. 2025, [Peer-reviewed], [Last author]
  Scientific journal
• Nutritional effects on the expression of cryptic pigmentation in freshwater isopods
  Moritz D. Lürig; Blake Matthews; Carsten J. Schubert; Osamu Kishida
  Oikos, Wiley, 04 Nov. 2025, [Peer-reviewed], [Last author]
  Scientific journal, Cryptic pigmentation is a key phenotypic adaptation that helps many benthic invertebrates evade visual predators. However, little is known about whether and how the expression of pigmentation phenotypes that match the habitat background is influenced by the availability of nutritional resources. Here we investigated whether variation in both the background and the nutritive composition of benthic substrates affect the expressed pigmentation of a freshwater isopod, Asellus hilgendorfii . We collected isopods and their predominant substrate from 17 locations across Hokkaido, northern Japan, and quantified substrate background and nutritional composition (total protein, 18 amino acids, and C:N and C:P ratios). We found that variation in isopod pigmentation was better explained by the substrate's nutritive composition than by its background darkness. Specifically, isopods were more pigmented when substrates had intermediate C:P ratios, lower C:N ratios, and a higher proportion of tryptophan – an essential amino acid involved in the isopods' pigmentation pathway. These results are consistent with previous experiments showing that isopods reared under diets with higher protein concentrations developed more pigmentation, advancing our understanding about the environmental sources of phenotypic variation in natural populations. By demonstrating that nutritional constraints may shape the expression of key phenotypic adaptations in natural populations, our study opens new directions for exploring how organisms navigate adaptive landscapes; particularly in those organisms that rely on pigmentation for signaling and camouflage. Finally, we demonstrate how macronutrients, amino acids, and elemental ratios can serve as biotracers in ecological studies of adaptation, offering new opportunities to examine how stoichiometric traits influence phenotypic plasticity and adaptive capacity, especially in detritivorous taxa.
• Annual variation in riverscape habitat use by a diadromous fish before oceanic migration
  Ryo Futamura; Kentaro Morita; Yoichiro Kanno; Akira Terui; Atsushi Okuda; Osamu Kishida
  Journal of Zoology, 326, 4, 320, 328, Wiley, 07 May 2025, [Peer-reviewed], [Last author]
  Scientific journal, Abstract
  
  Many animals reap significant benefits from migration, yet they face high mortality rates during the journey. As the mortality during migration typically operates more strongly on smaller migratory individuals (migrants), small pre‐migrants among migratory animals tend to grow better than larger ones prior to migration, enabling them to attain a larger body size. A common growth strategy for smaller pre‐migrants is extending their growth period compared to larger ones. Although this tactic has been documented in previous studies, the landscape‐scale habitat utilization that allowed smaller pre‐migrants to stay longer prior to migration remains largely unknown. Here, we focused on two distinct riverscape habitats (nursery habitat and transitional habitat) and investigated where smaller pre‐migrants of masu salmon (Oncorhynchus masou) stayed longer than larger ones prior to oceanic migration. We conducted an individual monitoring survey on their habitat utilization in two distinct migration years. We found that in 1 year, smaller pre‐migrants stayed longer in the transitional habitat compared to the nursery habitat, whereas in the other year, they stayed longer in the nursery habitat compared to the transitional habitat. This suggests that smaller pre‐migrants can adjust their duration of stay in each riverscape habitat. Our findings highlight the importance of conserving the entire pre‐migration habitat to enhance the resilience of migratory animals in the face of rapid environmental changes.
• Hydrological Connectivity and Local Environment Alternately Drive Spatial Structure of Floodplain Aquatic Community Across Seasons
  Hiromi Uno; Shunsuke Utsumi; Kentaro Morita; Osamu Kishida; Md. Khorshed Alam; Junjiro Negishi
  Ecology and Evolution, 15, 2, Wiley, 24 Feb. 2025, [Peer-reviewed]
  Scientific journal, ABSTRACT
  
  Seasonal changes in the environment often strongly influence biological communities. In environmental transition zones, or ecotones, the environment fluctuates over time between two different types of environments and the seasonal change is more pronounced. Although emphasis has been placed on the spatial variation of biota along environmental gradients, seasonal change has not been well studied despite the seasonal nature of many ecotones. In this study, we investigated seasonal shifts in aquatic community structures of floodplain waterbodies characterised as transitions between lotic and lentic environments, and further investigated the biological processes behind the shift. We observed a clear seasonal shift of community structure in floodplain waterbodies. From the spring snowmelt season to the summer low flow season, the aquatic community structure was largely driven by the hydrological connectivity to the river, represented as the timing of the lotic–lentic transition during the seasonal flood recession. In contrast, after a few months of summer low flow period, the effect weakened over time, and the communities were structured based more on the basis of the local environment. The seasonal shift was largely explained by the change in amphibian and aquatic insect larvae, the main members of the floodplain aquatic assemblage, which metamorphose and emerge from the water during the summer period and then redistribute in different ways more strongly influenced by local environmental factors such as water body size, temperature and dissolved oxygen levels. Given that biota in ecotones occupy the habitat for a limited time due to the severe environmental fluctuations, such seasonal changes as we observed in this study may be widespread in ecotones. Landscape and local environmental conditions could alternately shape community structures in different seasons. Further attention to the temporal aspects of community structure is needed for community studies and for conservation.
• Loss of habitat suitability and distribution range of the endangered Japanese giant salamander under climate change
  Clément Duret; Tiphanie Bartet; Alain Hambuckers; Osamu Kishida; Sumio Okada; Yuki Taguchi; Mizuki K. Takahashi; Mathieu Denoël
  Frontiers of Biogeography, 18, e133105, Pensoft Publishers, 05 Feb. 2025, [Peer-reviewed]
  English, Scientific journal, Giant salamanders are the world’s largest amphibians and keystone predators in riverine ecosystems where they face global declines. Identifying environmental variables influencing their distribution is, therefore, an essential step for their conservation. This study aims to assess the current habitat suitability and distribution of the Japanese giant salamander (Andrias japonicus) and to predict changes under future climate scenarios. We used species distribution models (SDMs) over a 282,916 km² area, including 477 high-resolution occurrence data of giant salamanders and seven remote-sensing environmental predictors (climatic, topographic and land use). We projected the prediction maps, identified the most contributing variables and calculated the shifts of suitable areas for three periods (2050, 2070 and 2090) under projected climatic conditions. Climatic variables highly contributed to the distribution of giant salamanders (76% of the total), with preferences for areas with moderate precipitations during cold and wet seasons and mild summer temperatures. A moderately steep surrounding environment was favourable for salamanders, whereas the land-use variables had less influence. Future climate predictions indicate a major decrease of suitable areas. Altogether, our results highlight the habitat preferences of giant salamanders at a broad scale and the negative impact of climate change on future suitable areas. These findings provide important steps for upcoming conservation actions for this threatened species in delineating favourable distribution ranges and priority areas that should be directly affected by climate change. Finally, they emphasise the need for new research at a fine scale on disturbances to the aquatic habitat to enhance the conservation of giant salamanders.
  
  We used a species distribution model (MaxEnt), high-resolution occurrence data and remote sensing data (climatic, topographic and land use) to identify suitable habitats for the Japanese giant salamander in Japan.
  
  The most suitable environments for the Japanese giant salamander are located both within and beyond its current distribution range, with the ‘Japanese Alps’ forming an impassable natural barrier.
  
  Among the variables studied, precipitation of the warmest quarter, precipitation of the coldest quarter, mean temperature of the warmest quarter and mean temperature of the wettest quarter were the most important environmental predictors of the species’ distribution.
  
  Climate change is expected to severely reduce the potential suitable geographical areas for the Japanese giant salamander in the future.
  
  The present work calls for new surveys based on the projected maps to improve the mapping of salamander distribution and to focus on ecological features and threats at the aquatic habitat level to understand the risks to their populations.
• Alien toxic toads suppress individual growth and phenotypic development of native predatory salamanders.
  Yoshihiro Inoue; Hisanori Okamiya; Takayuki Aota; Michael R Crossland; Osamu Kishida
  Oecologia, 207, 1, 27, 27, 30 Jan. 2025, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Alien species can influence populations of native species through individual-level effects such as predation, competition, and poisoning. For alien species that possess strong defensive chemicals, poisoning is one of the most powerful mechanisms of individual-level effects on native biota. Although toxic alien species could potentially negatively affect survival (lethal effects) or life history traits (sub-lethal effects) of native predators via poisoning, previous studies have mainly focused on acute lethal effects. Thus, delayed effects on predator life history traits have been largely overlooked. To fill this knowledge gap, we conducted laboratory and field experiments to investigate whether toxic alien prey (hatchlings and tadpoles of an invasive toad, Bufo formosus) affect the survival and/or growth and development of a native predatory salamander (larvae of Hynobius retardatus) on Hokkaido, Japan. The laboratory experiment revealed that consumption of a single toad hatchling exerted non-lethal effects on salamanders, but suppressed both salamander growth and development of an ecological phenotype (broad-gape) normally induced by environmental conditions. Furthermore, the field experiment in a natural pond showed that the presence of toad hatchlings and tadpoles resulted in reduced salamander growth (smaller body size) and lower survival of salamanders in the later larval period. The results of the laboratory and field experiments are complementary evidence of the life history impacts of the toxic alien toad on native salamanders. Thus, the poisoning effects of toxic alien species can affect the life history of native predators even if they do not exert acute lethality.
• QTL-based evidence of population genetic divergence in male territorial aggressiveness of the Japanese freshwater threespine stickleback
  Haruka Yamazaki; Seiichi Mori; Osamu Kishida; Atsushi J. Nagano; Tomoyuki Kokita
  Ecology and Evolution, 15, 1, e70795, Wiley, 09 Jan. 2025, [Peer-reviewed]
  Scientific journal, ABSTRACT
  
  Territorial aggression is widespread across the animal kingdom and is expressed in diverse ecological and social contexts. In addition, there are marked variations in the degree of male reproductive territoriality within and between species. These differences are often attributed to genetic components. However, the evolutionary genetic mechanisms in wild animals are poorly understood. This study explored the genetic basis of divergent male territorial aggressiveness between two Japanese freshwater populations, Gifu (GF) and Tomakomai (TM), in the threespine stickleback, which is a well‐known model system for both behavioral ecology and evolutionary genetics. First, our field survey indicated that the distribution of reproductive territories differed greatly across breeding habitats between the focal populations, and the density of reproductive territories was much greater in the GF population. Second, a one‐on‐one arena aquarium experiment on male–male combat using wild‐caught and common‐garden‐reared males revealed that GF males were genetically more aggressive than TM males. Finally, we performed quantitative trait loci (QTL) analysis using an F₂ hybrid cross between the two populations to identify the causal genomic regions contributing to the divergence in male territorial aggressiveness. Our QTL analysis identified a single significant locus in an aggression‐related behavioral component, that is, the number of bites of focal F₂ males toward a GF stimulus intruder. Two notable behavior‐related genes, HTR2A and MAO‐A, are found near this locus. These genes have often been suggested to influence of aggressive behavior in animals; therefore, they are regarded as important candidate genes for further functional analyses. Thus, we are the first to provide a QTL‐based genetic basis for population divergence in male territorial aggressiveness in the threespine stickleback.
• Northern shifts in the migration of Japanese glass eels to subarctic Hokkaido Island over the past three decades
  Yu-Lin K. Chang; Kentaro Morita; Kanta Muramatsu; Osamu Kishida; Mari Kuroki
  Ocean Dynamics, 75, 1, Springer Science and Business Media LLC, 07 Jan. 2025, [Peer-reviewed]
  Scientific journal
• Better habitat or not? Roles of deer wallows in early life history of amphibians
  Naru Matsuura; Hisanori Okamiya; Akira Terui; Masayuki Sakata; Hitoshi Araki; Osamu Kishida
  24 Dec. 2024
• Form-assortative mating behaviors of individuals from parasitic and non-parasitic populations of Arctic lamprey (Lethenteron camtschaticum)
  Léa Daupagne; Chiharu Furusawa; Hironori Mieda; Osamu Kishida; Emilien Lasne; édric Tentelier; Itsuro Koizumi
  Behavioral Ecology, 35, 6, arae073, Oxford University Press (OUP), 21 Sep. 2024, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Evolutionary theory predicts that assortative mating is crucial for sympatric speciation by generating reproductive isolation between diverging populations. Here, we investigate the potential of form-assortative mating, an assumed mating pattern in lampreys, for sympatric speciation. By continuously recording mating activity between anadromous and freshwater-resident forms of L. camtschaticum that greatly differ in body size, we show that lampreys tend to mate with individuals of similar size in experimental conditions. However, we highlight that this pattern does not result from a choice of same-form partner but is the result of the simultaneous action of a preference of males – whatever their size – for large anadromous females, a higher competitive ability of aggressive males and physical constraints on heteroform pairs. Moreover, we do not advocate that sympatric speciation, as the sole consequence of form-assortative mating through sexual selection, is a plausible mechanism for the diversification of lampreys as a significant number of sneaking behaviors were observed in freshwater-resident males toward large anadromous females. Broader attention should be given to mechanisms other than sexual selection that may lead to form-assortative mating, such as variations in spatial or temporal distribution of alternative forms during reproductive season.
• Two distinct host-parasite associations mediate seasonal ecosystem linkages
  Hinako Asakura; Ryo Futamura; Senri Moriyama; Satoko Iida; Koume Araki; Masato Ayumi; Shoji Kumikawa; Yuichi Matsuoka; Taro Takahashi; Jiro Uchida; Osamu Kishida; Takuya Sato
  Biology Letters, 20, 7, The Royal Society, 17 Jul. 2024, [Peer-reviewed]
  Scientific journal, Nematomorph parasites manipulate terrestrial arthropods to enter streams where the parasites reproduce. These manipulated arthropods become a substantial prey subsidy for stream salmonids, causing cross-ecosystem energy flow. Diverse nematomorph–arthropod associations underlie the energy flow, but it remains unknown whether they can mediate the magnitude and temporal attributes of the energy flow. Here, we investigated whether distinct phylogenetic groups of nematomorphs manipulate different arthropod hosts and mediate seasonal prey subsidy for stream salmonids. The results of our molecular-based diagnoses show that Gordionus and Gordius nematomorphs infected ground beetle and orthopteran hosts, respectively. The presumable ground beetle hosts subsidized salmonid individuals in spring, whereas the presumable orthopteran hosts did so in autumn. Maintaining the two distinct nematomorph–arthropod associations thus resulted in the parasite-mediated prey subsidy in both spring and autumn in the study streams. Manipulative parasites are common, and often associated with a range of host lineages, suggesting that similar effects of phylogenetic variation in host–parasite associations on energy flow might be widespread in nature.
• A comparison of sex‐specific markers for two wild masu salmon populations in Hokkaido, Japan
  Takuya K. Hosoki; Noël M. Clark; Ryo Futamura; Senri Moriyama; Osamu Kishida; Yoichiro Kanno
  Aquaculture, Fish and Fisheries, 4, 4, e194, Wiley, 09 Jul. 2024, [Peer-reviewed]
  Scientific journal, Abstract
  
  We evaluated the utility of three male‐specific molecular markers, sdY, sdY 227U and OtY2m, in two wild populations of masu salmon (Oncorhynchus masou) in southwestern Hokkaido, Japan. Male‐specific fragments amplified in all phenotypic males across the markers. Phenotypic females were genetically identified as males using sdY (57%) and sdY 227U (4%), but no phenotypic females were identified as males using OtY2m. We conclude that OtY2m was the most reliable sex marker, followed closely by sdY 227U, among those tested in our study populations. Additional research is warranted to test the applicability of these markers in other populations and Oncorhynchus species.
• Habitat characteristics of the Sakhalin taimen Parahucho perryi in the Butokamabetsu River, northern Hokkaido, Japan
  Hiroto Endo; Hiromi Uno; Osamu Kishida; Kentaro Morita
  Japanese Journal of Conservation Ecology, 28, 2, 453, 465, Dec. 2023, [Peer-reviewed]
  Japanese, Scientific journal
• Aging Contrast: A Contrastive Learning Framework for Fish Re-identification Across Seasons and Years
  Weili Shi; Zhongliang Zhou; Benjamin H. Letcher; Nathaniel Hitt; Yoichiro Kanno; Ryo Futamura; Osamu Kishida; Kentaro Morita; Sheng Li
  Lecture Notes in Computer Science, 252, 264, Springer Nature Singapore, 27 Nov. 2023, [Peer-reviewed]
  In book
• Air–breathing behavior underlies the cell death in limbs of Rana pirica tadpoles
  Satomi F. Ono; Ingrid Rosenburg Cordeiro; Osamu Kishida; Haruki Ochi; Mikiko Tanaka
  Zoological Letters, 9, 1, Springer Science and Business Media LLC, 09 Jan. 2023, [Peer-reviewed]
  Scientific journal, Abstract
  
  Amphibians shape their limbs by differential outgrowth of digits and interdigital regions. In contrast, amniotes employ cell death, an additional developmental system, to determine the final shape of limbs. Previous work has shown that high oxygen availability is correlated with the induction of cell death in developing limbs. Given the diversity of life histories of amphibians, it is conceivable that some amphibians are exposed to a high–oxygen environment during the tadpole phase and exhibit cell death in their limbs. Here, we examined whether air–breathing behavior underlies the cell death in limbs of aquatic tadpoles of the frog species Rana pirica. Our experimental approach revealed that R. pirica tadpoles exhibit cell death in their limbs that is likely to be induced by oxidative stress associated with their frequent air–breathing behavior.
• Proximate stimuli: An overlooked driving force for risk‐induced trait responses affecting interactions in aquatic ecosystems
  Hisanori Okamiya; Osamu Kishida
  Population Ecology, 64, 3, 205, 213, Wiley, 08 Feb. 2022, [Peer-reviewed], [Last author]
  Scientific journal, Abstract
  
  Inducible responses in prey to predation risk can influence species interaction strength, with significant ecological consequences. Much of the past research on interactions in aquatic ecosystems has focused on remote stimuli (e.g., diffusible chemicals emitted from predators and injured conspecifics, which easily propagate through environmental water), as cues triggering trait responses in prey, and has overlooked the importance of proximate stimuli (e.g., physical disturbance and less‐diffusible chemicals), which occur in attack or direct contact to prey by predators. Proximate stimuli from predators as well as remote stimuli may induce significant responses in prey functional traits such as behavior, morphology, and life history and, therefore, act as an important mechanism of top‐down effects in aquatic ecosystems. In this opinion paper, we argue that studying the effects of proximate stimuli is essential to better understanding of individual adaptation to predation risk in nature and ecological consequences of predator–prey interactions. Here, we propose research directions to examine the role of proximate stimuli for phenotypic plasticity and interaction systems.
• Size-dependent growth tactics of a partially migratory fish before migration
  Ryo Futamura; Kentaro Morita; Yoichiro Kanno; Shoji Kumikawa; Yuichi Matsuoka; Atsushi Okuda; Hiroshi Sugiyama; Hiroyuki Takahashi; Jiro Uchida; Osamu Kishida
  Oecologia, 22 Jan. 2022, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Size-selective mortality occurs in smolts during a seaward migration, but not in river residents, in masu salmon (Oncorhynchus masou)
  Ryo Futamura; Kentaro Morita; Yoichiro Kanno; Osamu Kishida
  Environmental Biology of Fishes, 105, 12, 1833, 1843, Springer Science and Business Media LLC, 17 Jan. 2022, [Peer-reviewed], [Last author]
  Scientific journal
• Switching of behavioral modes and their modulation by a geometrical cue in the ciliate Stentor coeruleus
  Echigoya, S.; Sato, K.; Kishida, O.; Nakagaki, T.; Nishigami, Y.
  Frontiers in Cell and Developmental Biology, 10, 2022
  Scientific journal
• Predators mitigate the destabilising effects of heatwaves on multitrophic stream communities
  Samuel R. P.‐J. Ross; Jorge García Molinos; Atsushi Okuda; Jackson Johnstone; Keisuke Atsumi; Ryo Futamura; Maureen A. Williams; Yuichi Matsuoka; Jiro Uchida; Shoji Kumikawa; Hiroshi Sugiyama; Osamu Kishida; Ian Donohue
  Global Change Biology, 28, 2, 403, 416, Jan. 2022, [Peer-reviewed]
  English, Scientific journal
• Occurrence of mature male white-spotted charr (Salvelinus leucomaenis) in spring, an unusual season
  Ryo Futamura; Kentaro Morita; Koume Araki; Masato Ayumi; Shoji Kumikawa; Yuichi Matsuoka; Atsushi Okuda; Hiroshi Sugiyama; Hiroyuki Takahashi; Taro Takahashi; Jiro Uchida; Osamu Kishida
  Ichthyological Research, 69, 1, 194, 196, Jan. 2022, [Peer-reviewed], [Last author]
  English, Scientific journal
• Utilizing environmental DNA for wide-range distributions of reproductive area of an invasive terrestrial toad in Ishikari river basin in Japan
  Hiroki Mizumoto; Osamu Kishida; Kotaro Takai; Naru Matsuura; Hitoshi Araki
  Biological Invasions, 24, 4, 1199, 1211, 15 Dec. 2021, [Peer-reviewed]
  English, Scientific journal
• Spatially variable hydrological and biological processes shape diverse post‐flood aquatic communities
  Hiromi Uno; Mizushi Yokoi; Keitaro Fukushima; Yoichiro Kanno; Osamu Kishida; Wataru Mamiya; Rei Sakai; Shunsuke Utsumi
  Freshwater Biology, 67, 3, 549, 563, 09 Dec. 2021, [Peer-reviewed]
  English, Scientific journal
• Paedomorphosis in the Ezo salamander (Hynobius retardatus) rediscovered after almost 90 years
  Okamiya, H.; Sugime, R.; Furusawa, C.; Inoue, Y.; Kishida, O.
  Zoological Letters, 7, 1, Springer Science and Business Media LLC, Dec. 2021, [Peer-reviewed], [Last author]
  Scientific journal
• Are toxic effects of alien species affected by their prey? Evaluation by bioassay with captive-bred toad embryos and a vulnerable predator
  Okamiya, H.; Tagami, M.; Crossland, M.; Kishida, O.
  Hydrobiologia, 848, 19, 4445, 4452, Springer Science and Business Media LLC, Nov. 2021, [Peer-reviewed], [Last author]
  Scientific journal
• Complex effects of body length and condition on within‐tributary movement and emigration in stream salmonids
  Yoichiro Kanno; Audrey C. Harris; Osamu Kishida; Shunsuke Utsumi; Hiromi Uno
  Ecology of Freshwater Fish, 04 Sep. 2021, [Peer-reviewed]
  English, Scientific journal
• Native frogs ( Rana pirica ) do not respond adaptively to alien toads ( Bufo japonicus formosus ) 100 years after introduction
  Hisanori Okamiya; Yoshihiro Inoue; Kotaro Takai; Michael R. Crossland; Osamu Kishida
  Ecological Research, Wiley, 30 Aug. 2021, [Peer-reviewed], [Last author]
  Scientific journal
• Hatch timing of two subarctic salmonids in a stream network estimated by otolith increments
  Kevin A. Fitzgerald; Matt R. Haworth; Kevin R. Bestgen; Collin J. Farrell; Shunsuke Utsumi; Osamu Kishida; Hiromi Uno; Yoichiro Kanno
  Fisheries Management and Ecology, 28, 6, 507, 515, 29 Jun. 2021, [Peer-reviewed]
  English, Scientific journal
• The japanese common toad, bufo japonicus formosus, contains toxin in the egg stage
  Okamiya, H.; Takai, K.; Kishida, O.
  Current Herpetology, 40, 1, Herpetological Society of Japan, 02 Mar. 2021, [Peer-reviewed], [Last author]
  Scientific journal
• Demography and productivity during the recovery time sequence of a wild edible bamboo after large-scale anthropogenic disturbance
  Noboru Katayama; Osamu Kishida; Chikako Miyoshi; Shintaro Hayakashi; Kinya Ito; Rei Sakai; Aiko Naniwa; Hiroyuki Takahashi; Kentaro Takagi
  PLOS ONE, 15, 12, e0243089, e0243089, Public Library of Science (PLoS), 01 Dec. 2020, [Peer-reviewed]
  Scientific journal
• Expression of Genes Involved in Offensive and Defensive Phenotype Induction in the Pituitary Gland of the Hokkaido Salamander (Hynobius retardatus)
  Matsunami, M.; Miura, T.; Kishida, O.; Michimae, H.; Nishimura, K.
  Zoological Science, 37, 6, Zoological Society of Japan, 12 Oct. 2020, [Peer-reviewed]
  Scientific journal
• Enhanced recruitment of larger predators in the presence of large prey
  Takatsu, K.; Kishida, O.
  Journal of Animal Ecology, 89, 7, 1615, 1627, Wiley, Jul. 2020, [Peer-reviewed], [Last author]
  Scientific journal
• A multistate mark–recapture approach to characterize stream fish movement at multiple spatial scales
  Kanno, Y.; Yui, N.; Mamiya, W.; Sakai, R.; Yabuhara, Y.; Miyazaki, T.; Utsumi, S.; Kishida, O.; Uno, H.
  Canadian Journal of Fisheries and Aquatic Sciences, 77, 6, 1090, 1100, Canadian Science Publishing, Jun. 2020, [Peer-reviewed]
  Scientific journal
• Prospective interspecies interaction between Siberian and Ezo salamander larvae
  Atsumi, K.; Kishida, O.
  Ecological Research, 35, 3, 533, 539, Wiley, May 2020, [Peer-reviewed], [Last author]
  Scientific journal
• Host phenologies and the life history of horsehair worms (Nematomorpha, Gordiida) in a mountain stream in northern Japan
  Meguro, N.; Kishida, O.; Utsumi, S.; Niwa, S.; Igarashi, S.; Kozuka, C.; Naniwa, A.; Sato, T.
  Ecological Research, 35, 3, 482, 493, Wiley, May 2020, [Peer-reviewed]
  Scientific journal
• Comparison of susceptibility to a toxic alien toad (Bufo japonicus formosus) between predators in its native and invaded ranges
  Narumi Oyake; Nayuta Sasaki; Aya Yamaguchi; Hiroyuki Fujita; Masataka Tagami; Koki Ikeya; Masaki Takagi; Makoto Kobayashi; Harue Abe; Osamu Kishida
  FRESHWATER BIOLOGY, 65, 2, 240, 252, Feb. 2020, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Visual preference of males for conspecific mates in mutually ornamented fish: possible support for the species recognition hypothesis
  Atsumi, K.; Kishida, O.; Koizumi, I.
  Journal of Ethology, 37, 3, 353, 362, Sep. 2019, [Peer-reviewed]
  Scientific journal
• Long-term fauna and flora records of the experimental forests of the Forest Research Station of Hokkaido University, Japan
  Terada, Chisato; Kwon, TaeOh; Kazahari, Nobuko; Kishida, Osamu; Utsumi, Shunsuke
  ECOLOGICAL RESEARCH, 34, 3, 349, 349, May 2019, [Peer-reviewed]
  English, Scientific journal
• Verification of genetic differentiation of Rana ornativentris between Sado Island and Honsyu.
  Koike Minami; Matsuo Ayumi; Hirota Shun; Kiaida Osamu; Suyama Yoshihisa; Abe Harue
  The Japanese Forest Society Congress, 130, 0, 424, 424, THE JAPANESE FORESTRY SOCIETY, 2019, [Peer-reviewed]
  Japanese,

  [in Japanese]

• Foraging traits of native predators determine their vulnerability to a toxic alien prey
  Kazila, E.; Kishida, O.
  Freshwater Biology, 64, 1, 56, 70, Jan. 2019, [Peer-reviewed], [Last author]
  Scientific journal
• Environmental DNA enables detection of terrestrial mammals from forest pond water
  Masayuki Ushio; Hisato Fukuda; Toshiki Inoue; Kobayashi Makoto; Osamu Kishida; Keiichi Sato; Koichi Murata; Masato Nikaido; Tetsuya Sado; Yukuto Sato; Masamichi Takeshita; Wataru Iwasaki; Hiroki Yamanaka; Michio Kondoh; Masaki Miya
  MOLECULAR ECOLOGY RESOURCES, 17, 6, e63, e75, Nov. 2017, [Peer-reviewed]
  English, Scientific journal
• Giant cannibals drive selection for inducible defence in heterospecific prey
  Kunio Takatsu; Volker H. W. Rudolf; Osamu Kishida
  BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 120, 3, 675, 684, Mar. 2017, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Soldiers with large weapons behave aggressively against predators: correlated morphological and behavioral defensive traits in a eusocial aphid
  Mitsuru Hattori; Osamu Kishida; Takao Itino
  INSECTES SOCIAUX, 64, 1, 39, 44, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• Contacts with large, active individuals intensify the predation risk of small conspecifics
  Aya Yamaguchi; Kunio Takatsu; Osamu Kishida
  ECOLOGY, 97, 11, 3206, 3218, Nov. 2016, [Peer-reviewed], [Last author]
  English, Scientific journal
• Networks Depicting the Fine-Scale Co-Occurrences of Fungi in Soil Horizons
  Hirokazu Toju; Osamu Kishida; Noboru Katayama; Kentaro Takagi
  PLOS ONE, 11, 11, Nov. 2016, [Peer-reviewed]
  English, Scientific journal
• An aquatic vertebrate can use amino acids from environmental water
  Noboru Katayama; Kobayashi Makoto; Osamu Kishida
  PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 283, 1839, 20160996, Sep. 2016, [Peer-reviewed], [Last author]
  English, Scientific journal
• Overwintering larvae of Hynobius retardatus salamanders can consume invertebrate prey at very low temperatures
  Aya Yamaguchi; Osamu Kishida
  SALAMANDRA, 52, 1, 45, 47, Apr. 2016, [Peer-reviewed], [Last author]
  English
• Antagonistic indirect interactions between large and small conspecific prey via a heterospecific predator
  Aya Yamaguchi; Osamu Kishida
  OIKOS, 125, 2, 271, 277, Feb. 2016, [Peer-reviewed], [Last author]
  English, Scientific journal
• Response of a Wild Edible Plant to Human Disturbance: Harvesting Can Enhance the Subsequent Yield of Bamboo Shoots
  Noboru Katayama; Osamu Kishida; Rei Sakai; Shintaro Hayakashi; Chikako Miyoshi; Kinya Ito; Aiko Naniwa; Aya Yamaguchi; Katsunori Wada; Shiro Kowata; Yoshinobu Koike; Katsuhiro Tsubakimoto; Kenichi Ohiwa; Hirokazu Sato; Toru Miyazaki; Shinichi Oiwa; Tsubasa Oka; Shinya Kikuchi; Chikako Igarashi; Shiho Chiba; Yoko Akiyama; Hiroyuki Takahashi; Kentaro Takagi
  PLOS ONE, 10, 12, e0146228, e0146228, 31 Dec. 2015, [Peer-reviewed]
  Scientific journal
• Nonadditive impacts of temperature and basal resource availability on predator-prey interactions and phenotypes
  Zacharia J. Costa; Osamu Kishida
  OECOLOGIA, 178, 4, 1215, 1225, Aug. 2015, [Peer-reviewed], [Last author]
  English, Scientific journal
• Predator cannibalism can intensify negative impacts on heterospecific prey
  Kunio Takatsu; Osamu Kishida
  ECOLOGY, 96, 7, 1887, 1898, Jul. 2015, [Peer-reviewed], [Last author]
  English, Scientific journal
• Transcriptome analysis of predator- and prey-induced phenotypic plasticity in the Hokkaido salamander (Hynobius retardatus)
  Masatoshi Matsunami; Jun Kitano; Osamu Kishida; Hirofumi Michimae; Toru Miura; Kinya Nishimura
  MOLECULAR ECOLOGY, 24, 12, 3064, 3076, Jun. 2015, [Peer-reviewed]
  English, Scientific journal
• Gene expression profiles in Rana pirica tadpoles following exposure to a predation threat
  Tsukasa Mori; Yukio Yanagisawa; Yoichiro Kitani; Manabu Sugiyama; Osamu Kishida; Kinya Nishimura
  BMC GENOMICS, 16, 258, Apr. 2015, [Peer-reviewed]
  English, Scientific journal
• Adaptive acceleration in growth and development of salamander hatchlings in cannibalistic situations
  Osamu Kishida; Ayumi Tezuka; Akiko Ikeda; Kunio Takatsu; Hirofumi Michimae
  Functional Ecology, 29, 4, 469, 478, Apr. 2015, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Feedback between size balance and consumption strongly affects the consequences of hatching phenology in size-dependent predator-prey interactions
  Megumi Nosaka; Noboru Katayama; Osamu Kishida
  OIKOS, 124, 2, 225, 234, Feb. 2015, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Allometric equations for estimation of energy contents from body length for common amphibians (Hynobius retardatus and Rana pirica) in Hokkaido, Japan
  Takatsu, K.; Kishida, O.
  Herpetology Notes, 8, 187, 191, 2015, [Peer-reviewed], [Last author]
  English, Scientific journal
• Dynamics of ecosystem carbon balance recovering from a clear-cutting in a cool-temperate forest
  Maricar Aguilos; Kentaro Takagi; Naishen Liang; Masahito Ueyama; Karibu Fukuzawa; Mutsumi Nomura; Osamu Kishida; Tatsuya Fukazawa; Hiroyuki Takahashi; Chikara Kotsuka; Rei Sakai; Kinya Ito; Yoko Watanabe; Yasumi Fujinuma; Yoshiyuki Takahashi; Takeshi Murayama; Nobuko Saigusa; Kaichiro Sasa
  Agricultural and Forest Meteorology, 197, 26, 39, Oct. 2014, [Peer-reviewed]
  Scientific journal
• Herbivorous insect decreases plant nutrient uptake: the role of soil nutrient availability and association of below-ground symbionts
  Noboru Katayama; Alessandro O. Silva; Osamu Kishida; Masayuki Ushio; Satoshi Kita; Takayuki Ohgushi
  ECOLOGICAL ENTOMOLOGY, 39, 4, 511, 518, Aug. 2014, [Peer-reviewed]
  English, Scientific journal
• Inducible offences affect predator-prey interactions and life-history plasticity in both predators and prey
  Osamu Kishida; Zacharia Costa; Ayumi Tezuka; Hirofumi Michimae
  JOURNAL OF ANIMAL ECOLOGY, 83, 4, 899, 906, Jul. 2014, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Environment-dependent trade-offs and phenotypic plasticity in metamorphic timing
  Hirofumi Michimae; Ayumi Tezuka; Takeshi Emura; Osamu Kishida
  EVOLUTIONARY ECOLOGY RESEARCH, 16, 7, 617, 629, 2014, [Peer-reviewed], [Last author]
  English, Scientific journal
• Aphids decelerate litter nitrogen mineralisation through changes in litter quality
  Noboru Katayama; Alessandro Oliveria Silva; Osamu Kishida; Takayuki Ohgushi
  ECOLOGICAL ENTOMOLOGY, 38, 6, 627, 630, Dec. 2013, [Peer-reviewed]
  English, Scientific journal
• Soldiers with large weapons in predator-abundant midsummer: phenotypic plasticity in a eusocial aphid
  Mitsuru Hattori; Osamu Kishida; Takao Itino
  EVOLUTIONARY ECOLOGY, 27, 5, 847, 862, Sep. 2013, [Peer-reviewed]
  English, Scientific journal
• Overwintered Hynobius retardatus salamander larvae can induce defensive bulgy morph in Rana pirica tadpoles
  Kishida, O.; Tezuka, A.
  Herpetology Notes, 6, 1, 183, 185, Mar. 2013, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• An offensive predator phenotype selects for an amplified defensive phenotype in its prey
  Kunio Takatsu; Osamu Kishida
  Evolutionary Ecology, 27, 1, 1, 11, Jan. 2013, [Peer-reviewed], [Last author]
  English, Scientific journal
• Buying time for colony mates: The anti-predatory function of soldiers in the eusocial aphid Ceratovacuna japonica (Homoptera, Hormaphidinae)
  Hattori, M.; Kishida, O.; Itino, T.
  Insectes Sociaux, 60, 1, 15, 21, Jan. 2013, [Peer-reviewed]
  Scientific journal
• Histological and MS spectrometric analyses of the modified tissue of bulgy form tadpoles induced by salamander predation
  Tsukasa Mori; Yoichiro Kitani; Jun Ogihara; Manabu Sugiyama; Goshi Yamamoto; Osamu Kishida; Kinya Nishimura
  BIOLOGY OPEN, 1, 4, 308, 317, Apr. 2012, [Peer-reviewed]
  English, Scientific journal
• Predation risk suppresses the positive feedback between size structure and cannibalism
  Osamu Kishida; Geoffrey C. Trussell; Ayaka Ohno; Shinya Kuwano; Takuya Ikawa; Kinya Nishimura
  JOURNAL OF ANIMAL ECOLOGY, 80, 6, 1278, 1287, Nov. 2011, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Coevolution of phenotypic plasticity in predator and prey: why are inducible offenses rarer than inducible defenses?
  Akihiko Mougi; Osamu Kishida; Yoh Iwasa
  EVOLUTION, 65, 4, 1079, 1087, Apr. 2011, [Peer-reviewed]
  English, Scientific journal
• Trait-mediated indirect interactions in ecological communities SPECIAL FEATURE: PREFACE
  Shunsuke Utsumi; Osamu Kishida; Takayuki Ohgushi
  POPULATION ECOLOGY, 52, 4, 457, 459, Oct. 2010, [Peer-reviewed]
  English
• Evolutionary ecology of inducible morphological plasticity in predator-prey interaction: toward the practical links with population ecology
  Osamu Kishida; Geoffrey C. Trussell; Akihiko Mougi; Kinya Nishimura
  POPULATION ECOLOGY, 52, 1, 37, 46, Jan. 2010, [Peer-reviewed], [Lead author, Corresponding author]
  English
• Inducible defenses in prey intensify predator cannibalism
  Osamu Kishida; Geoffrey C. Trussell; Kinya Nishimura; Takayuki Ohgushi
  ECOLOGY, 90, 11, 3150, 3158, Nov. 2009, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Reciprocal phenotypic plasticity can lead to stable predator-prey interaction
  Akihiko Mougi; Osamu Kishida
  JOURNAL OF ANIMAL ECOLOGY, 78, 6, 1172, 1181, Nov. 2009, [Peer-reviewed], [Last author]
  English, Scientific journal
• Identification of a novel Uromodulin-like gene related to predator-induced bulgy morph in anuran tadpoles by functional microarray analysis
  Tsukasa Mori; Hiroko Kawachi; Chiharu Imai; Manabu Sugiyama; Youichi Kurata; Osamu Kishida; Kinya Nishimura
  PLOS ONE, 4, 6, e5936, Jun. 2009, [Peer-reviewed]
  English, Scientific journal
• Top-down effects on antagonistic inducible defense and offense
  Osamu Kishida; Geoffrey C. Trussell; Kinya Nishimura
  ECOLOGY, 90, 5, 1217, 1226, May 2009, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Direct and indirect induction of a compensatory phenotype that alleviates the costs of an Inducible defense
  Tadashi Iwami; Osamu Kishida; Kinya Nishimura
  PLOS ONE, 2, 10, e1084, Oct. 2007, [Peer-reviewed]
  English, Scientific journal
• Geographic variation in a predator-induced defense and its genetic basis
  Osamu Kishida; Geoffrey C. Trussell; Kinya Nishimura
  ECOLOGY, 88, 8, 1948, 1954, Aug. 2007, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Flexible inducible morphological defense in anuran larvae
  Kishida Osamu; Nishimura Kinya
  Japanese Journal of Ecology, 57, 1, 40, 47, The Ecological Society of Japan, 31 Mar. 2007, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, 多くの動物は、捕食者に出会うと逃げたり隠れたりするが、形さえも変化させ捕食を回避しようとするものもいる。形態の変化による防御戦略は誘導防御形態戦略とよばれ、多様な生物分類群でみられる表現型可塑性として知られる。最近の研究では、捕食者動物は、ただ捕食されにくい形に変わるだけでなく、その変化が柔軟であり、捕食者環境の時間的・空間的な変異によく対応していることが知られている。本稿では、エゾアカガエルのオタマジャクシの捕食者誘導形態の防御機能と、柔軟な形態変化能について紹介する。エゾアカガエルのオタマジャクシは、捕食者のエゾサンショウウオの幼生とオオルリボシヤンマのヤゴに対して、それぞれに特異的な形態を発現する。サンショウウオ幼生によって誘導された膨満型の形態はサンショウウオ幼生による丸のみを妨げ、ヤゴによって誘導された高尾型の形態はヤゴによる捕食を回避するために有効である。これらの形態変化は柔軟性に富んでおり、一度、どちらかの捕食者に対して特異的な防御形態を発現した後でも、捕食者が交替したときには、新たな捕食者に特異的な防御形態へ変化できる。また、捕食の危険が取り除かれたときは元の形態へと戻る。捕食者特異的な形態の互換性は、捕食者種に特異的な防御形態誘導を獲得するうえで重要な役割を果たしたと考えられる。また、形態変化の可逆性は防御にコストがかかることを示唆している。これらの形態変化...
• Reciprocal phenotypic plasticity in a predator-prey interaction between larval amphibians
  Osamu Kishida; Yuuki Mizuta; Kinya Nishimura
  ECOLOGY, 87, 6, 1599, 1604, Jun. 2006, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Flexible architecture of inducible morphological plasticity
  O Kishida; K Nishimura
  Journal of Animal Ecology, 75, 3, 705, 712, May 2006, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Genetic basis of phenotypic plasticity for predator-induced morphological defenses in anuran tadpole, Rana pirica, using cDNA subtraction and microarray analysis
  Tsukasa Mori; Ikuei Hiraka; Youichi Kurata; Hiroko Kawachi; Osamu Kishida; Kinya Nishimura
  Biochemical and Biophysical Research Communications, 330, 4, 1138, 1145, May 2005, [Peer-reviewed]
  Scientific journal
• Multiple inducible defences against multiple predators in the anuran tadpole, Rana pirica
  Osamu Kishida; Kinya Nishimura
  Evolutionary Ecology Research, 7, 4, 619, 631, May 2005, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Genetic basis of phenotypic plasticity for predator-induced morphological defenses in anuran tadpole, Rana pirica, using cDNA subtraction and microarray analysis
  T Mori; Hiraka, I; Y Kurata; H Kawachi; O Kishida; K Nishimura
  BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 330, 4, 1138, 1145, May 2005
  English, Scientific journal
• Bulgy tadpoles: inducible defense morph
  O Kishida; K Nishimura
  OECOLOGIA, 140, 3, 414, 421, Aug. 2004, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Coupling of two competitive systems via density dependent migration
  Kinya Nishimura; Osamu Kishida
  ECOLOGICAL RESEARCH, 16, 3, 359, 368, Sep. 2001, [Peer-reviewed], [Last author]
  English, Scientific journal

• Is a lamprey sneaker interrupt a pair spawning or increase female’s reproductive success?
  三枝弘典; 古澤千春; 岸田治; 小泉逸郎, 日本生態学会大会講演要旨(Web), 71st, 2024
• Fertilization success of sneaking vs. pair-mating Siberian brook lampreys
  三枝弘典; 古澤千春; DAUPAGNE Lea; 岸田治; 小泉逸郎, 日本生態学会大会講演要旨(Web), 70th, 2023
• Site tenacity in male resident masu salmon (Oncorhynchus masou)
  森山泉梨; 二村凌; 奥田篤志; 内田次郎; 岸田治, 日本生態学会大会講演要旨(Web), 70th, 2023
• サクラマス残留型のハビタット変更-個体のサイズに着目して
  森山泉梨; 菅野陽一郎; 二村凌; 奥田篤志; 森田健太郎; 岸田治, 個体群生態学会大会プログラム・講演要旨集(Web), 39th, 2023
• Size-dependent behaviors of river-descending masu salmon
  二村凌; 菅野陽一郎; 照井慧; 森田健太郎; 奥田篤志; 岸田治, 日本生態学会大会講演要旨(Web), 69th, 2022
• Changes in growth rate and growth duration? size dependent tactics in juvenile masu salmon before oceanic migration.
  二村凌; 森田健太郎; 菅野陽一郎; 汲川正次; 奥田篤志; 松岡雄一; 杉山弘; 高橋廣行; 高井孝太郎; 内田次郎; 岸田治, 日本生態学会大会講演要旨(Web), 68th, 2021
• サクラマスの降海時の行動様式
  二村凌; 森田健太郎; 菅野陽一郎; 岸田治, 個体群生態学会大会プログラム・講演要旨集(Web), 37th, 2021
• A test of the effects of species diversity of definitive hosts on the infection dynamics of horsehair worms in Hokkaido, Japan.
  友渕直人; 内海俊介; 太田民久; 岸田治; 舘野隆之輔; 丹羽滋; 長谷川功; 瀧本岳; 森健介; 佐藤拓哉, 日本生態学会大会講演要旨(Web), 68th, 2021
• Inducible defenses against an offensive predator in the anuran tadpole, Rana ornativentris Werner.
  後藤俊矢; 清水宏一郎; 岸田治; 阿部晴恵, 日本生態学会大会講演要旨(Web), 67th, 2020
• Morphological changes of Japanese black salamander’s jaw in cannibalism and predation on tadpoles.
  清水宏一郎; 後藤俊矢; 岸田治; 阿部晴恵, 日本生態学会大会講演要旨(Web), 67th, 2020
• Do the ecology of residential and migratory form in Masu salmon (Onchorynchus masou) already differ in juvenile stage?
  二村凌; 森田健太郎; 菅野陽一郎; 岸田治, 日本生態学会大会講演要旨(Web), 67th, 2020
• For successful migration: Size dependent growth tactics of a salmonid in pre-migration period.
  二村凌; 森田健太郎; 菅野陽一郎; 岸田治, 個体群生態学会大会プログラム・講演要旨集(Web), 36th, 2020
• 可塑的形態のリアクションノームの地域変異はRAD‐seqによる集団遺伝情報から読み解けるか
  松波雅俊; 北野潤; 岸田治; 道前洋史; 永野惇; 豊田敦; 藤山秋佐夫; 三浦徹; 西村欣也, 日本進化学会大会プログラム・講演要旨集(Web), 20th, 105 (WEB ONLY), 22 Aug. 2018
  Japanese
• What can we do for revitalization of higher education? : Group discussion in Annual meeting of Forest Research Station 2015
  中路 達郎; 岸田 治; 内海 俊介; 福澤 加里部; 伊藤 悠也; 間宮 春大; 芦谷 大太郎; 上浦 達哉; 小林 真, 北方森林保全技術, 34, 43, 47, Feb. 2017
  北海道大学北方生物圏フィールド科学センター森林圏ステーション, Japanese
• エゾサンショウウオにおける表現型可塑性の地域集団比較
  松波雅俊; 北野潤; 岸田治; 道前洋史; 三浦徹; 西村欣也, 日本生態学会大会講演要旨(Web), 63th, P2‐219 (WEB ONLY), 2016
  Japanese
• 被食者・捕食者によって引き起こされるエゾサンショウウオ幼生の表現型可塑性についてのトランスクリプトーム解析
  松波雅俊; 北野潤; 岸田治; 道前洋史; 三浦徹; 西村欣也, 日本進化学会大会プログラム・講演要旨集(Web), 17th, ROMBUNNO.2A‐6 (WEB ONLY), 20 Aug. 2015
  Japanese
• 天然更新によるトドマツ人工林複層林化への試み―鋸谷式間伐と樹冠下掻起しの実践―
  坂井励; 吉田俊也; 小塚力; 高木健太郎; 岸田治; 片山昇; 高橋廣行; 浪花愛子; 伊藤欣也; 実吉智香子; 五十嵐満; 和田克法; 大岩敏昭; 永井義隆; 古和田四郎; 小池義信; 椿本勝博; 大岩健一; 佐藤博和; 宮崎徹; 大岩真一; 岡翼, 北方森林保全技術, 32, 1, 11, 23 Mar. 2015
  北海道大学北方生物圏フィールド科学センター森林圏ステーション, Japanese
• 天然更新によるトドマツ人工林複層林化への試み
  坂井励; 吉田俊也; 小塚力; 高木健太郎; 岸田治; 片山昇; 高橋廣行; 浪花愛子; 伊藤欣也; 実吉智香子; 五十嵐満; 和田克法; 大岩敏昭; 永井義隆; 古和田四郎; 小池義信; 椿本勝博; 大岩健一; 佐藤博和; 宮崎徹; 大岩真一; 岡翼, 北海道大学総合技術研究会報告集 平成26年度(CD-ROM), 2014
• トランスクリプトーム解析で迫るエゾサンショウウオの表現型可塑性の分子機構
  松波雅俊; 岸田治; 北野潤; 道前洋史; 三浦徹; 西村欣也, 日本生態学会大会講演要旨(Web), 61st, D2-08 (WEB ONLY), 2014
  Japanese
• トランスクリプトーム解析で迫るエゾサンショウウオの表現型可塑性の分子機構
  松波雅俊; 岸田治; 北野潤; 道前洋史; 三浦徹; 西村欣也, 個体群生態学会大会プログラム・講演要旨集, 29th, 29, 11 Oct. 2013
  Japanese
• Number and weight of embryos of a Kyushu population of the blotched salamander (Hynobius naevius)
  手塚 あゆみ; 立脇 康嗣; 岸田 治, 爬虫両棲類学会報, 2012, 2, 109, 111, Sep. 2012
  日本爬虫両棲類学会, Japanese
• 形を変えるオタマジャクシ : 操作実験からのアプローチ
  岸田 治, 種生物学研究, 35, 0, 11, 52, 31 Mar. 2012
  Japanese
• The history and prospects of silviculture in Teshio Experimental Forest
  小塚 力; 高木 健太郎; 岸田 治, 北方森林保全技術, 0, 29, 1, 13, Nov. 2011
  北海道大学北方生物圏フィールド科学センター森林圏ステーション, Japanese
• Hypothesis testing : recommended approach for long-term monitoring studies : Case studies of oak acorn production and deer population
  中村 誠宏; 岸田 治, 北方森林保全技術, 0, 29, 30, 35, Nov. 2011
  北海道大学北方生物圏フィールド科学センター森林圏ステーション, Japanese
• On the special feature
  Kishida Osamu; Irie Takahiro, Japanese Journal of Ecology, 57, 1, 25, 26, 31 Mar. 2007
  The Ecological Society of Japan, Japanese
• 密度依存的移動によって連関した2つの競争系
  西村 欣也; 岸田 治, 日本生態学会誌, 51, 3, 20 Dec. 2001
  日本生態学会, Japanese

• 多種系における表現型可塑性（分担執筆） シリーズ群集生態学2 進化生物学からせまる
  京都大学学術出版会, 2009

• 森林圏科学特論Ⅲ, 2024年, 修士課程, 環境科学院
• 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
• 北方生態系の生物多様性基礎論, 2024年, 修士課程, 環境科学院
• 動物生態学特論Ⅱ, 2024年, 修士課程, 環境科学院
• 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
• 野生動物管理実習, 2024年, 学士課程, 農学部
• 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
• 野生動物管理学, 2024年, 学士課程, 農学部
• 暖温帯林施業実習, 2024年, 学士課程, 農学部
• 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
• 森林空間機能学, 2024年, 学士課程, 農学部
• 森林空間機能学演習, 2024年, 学士課程, 農学部

• Ecological genetics of speciation in natural populations
  Grants-in-Aid for Scientific Research
  27 Apr. 2022 - 31 Mar. 2027
  北野 潤; 岸田 治; 石川 麻乃; 山崎 曜; 山道 真人
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), National Institute of Genetics, 22H04983
• Animal movements as adaptive tactics: field monitoring survey of salmonid species
  Grants-in-Aid for Scientific Research
  01 Apr. 2022 - 31 Mar. 2026
  岸田 治
  4月，7月，10月に幌内川の上流域5.3kmの調査区間において採捕調査を行い，個体にPITタグを装着した. 持ち運び式のPITタグアンテナを用いて調査区間内を毎月１度以上踏査し，個体位置の把握をした．魚の広域移動は河川６箇所に設置した個体式のアンテナで常時モニタリングした．以上の調査から得られたデータに加え以前から蓄積してきたデータをあわせて解析し、以下の研究を実施した
  研究① 移動の同調性のパターン解析：サケ科魚類を対象とし、個体の移動パターンを分析した．サクラマスでは繁殖時期に移動が盛んになるが，それは成熟個体のみならず未成熟の個体においてもみられることが明らかとなった．未成熟個体は卵を食うためか，成熟個体の移動に伴うハビタット内の個体間競争の変化に応答して移動をした可能性がある。
  研究② 倒木によるハビタット形成後の移動様式の探索：本年度は予備実験を行った。幌内川中流に倒木を設置し，淵ができる過程を観測しつつ，魚類の定着を確認した。この結果をもとに次年度に大規模な実験を展開する。
  研究③移動の日周性の分析：サクラマスでは夕方と朝方に毎日移動をしている個体が一定数おり、昼間の生息場所と夜間の生息場所を変えている可能性が示唆された。
  研究④サクラマスのハビタット変更：サクラマスでは繁殖時期に河川内を盛んに移動し，それをきっかけとしてハビタットを変える場合が多いことがわかっているが，ハビタットを帰る際，どのようなハビタットに入植するのかを調べたところ，繁殖期以前に，自分と同じか大きいサイズの個体が抜けた空間に新しく定着することがわかり，河川スケールでの個体の入れ替わりが生じていることが示唆された．
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23K23957
• Animal movements as adaptive tactics: field monitoring survey of salmonid species
  Grants-in-Aid for Scientific Research
  01 Apr. 2022 - 31 Mar. 2026
  岸田 治
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 22H02694
• Defensive behavior of prey animals in a closed system: experimental approach using amphibian larvae
  Grants-in-Aid for Scientific Research
  16 Jun. 2022 - 31 Mar. 2024
  岸田 治
  本年度は以下の4つの研究に取り組んだ。
  ①個体の動きが食う‐食われるの関係を生む：個体は他個体が近づいたときに逃避する．逃避によって，一時的に危険から逃れられるが，逃げた先で他個体と遭遇し，新たな動きや，食う－食われるの関係が発生する可能性がある。この仮説を同種他個体や他種の存在を操作した実験で検証した。逃避と他個体との遭遇は、操作上、加えた種によって異なっていることが明らかになり、特に活発に動き回る種ほど効果が大きい傾向が見られた。
  ②大きな餌を食うことのコスト：「捕食者が大きな餌を捕食する際、サイズと抵抗の大きさからハンドリングが難しいため、捕食中の動作が大きくなることで、上位の捕食者から襲われる確率が高くなる」という仮説をエゾサンショウウオを用いた操作実験で実証した。
  ③シカの移動経路と両生類幼生の産卵生態 シカが頻繁に通る経路（シカ道）は踏み固められたり掘削されることで，水が溜まりやすい．このような水場は,水生動物の生息場所となる可能性がある.本研究では，釧路湿原のキタサンショウウオを対象にエゾシカのシカ道の利用状況をフィールドでの調査により明らかにした。その結果、我々の調査地域では、95％の卵がシカ道に産み付けられていることがわかり、同種の産卵場所としてのシカ道への依存性が強いことが明らかとなった。
  ④捕食者誘導型の形態における逃避強化メカニズムの解明：捕食者がいない場合といる場合とで形態を可塑的に変化させる動物は多い．本研究では、エゾアカガエル幼生を対象として逃避行動誘発実験を行い、撮影した動画の解析により、捕食者誘導型の表現型が一度の遊泳動作による加速度が大きいことを明らかにし、形態と行動のメカ二スティックな関係を実証した。
  Japan Society for the Promotion of Science, Grant-in-Aid for Transformative Research Areas (A), Hokkaido University, 22H05644
• Integrative strategy in behavior and life history: explorative study using PIT tag systems
  Grants-in-Aid for Scientific Research
  30 Jul. 2020 - 31 Mar. 2022
  Kishida Osamu
  Movement of animals is a key for deepening our understanding of ecology of animals. In this study, we explored what kind of mortality pressure operate on the individuals during their movement, and what tactics animals take against the mortality pressure. We addressed these issues by focusing migration of masu salmon juveniles by conducting individual survey using a PIT tag system. First, we found that river-descending migrants were exposed to size-dependent mortality, in which smaller individuals suffer higher mortality pressure. Second, we showed that smaller migrants exhibited higher growth rate in the pre-migration period and descend the river in later timing than larger migrants. Because the faster growth and later start of migration of smaller migrants allow them to become into larger size before migration, these life history and behavioral pattens represent tactics under size-dependent mortality in the migration.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, 20K21439
• Ecology of Size Dynamics
  Grants-in-Aid for Scientific Research
  Apr. 2017 - Mar. 2022
  Osamu Kishida
  Ministry of Education, Culture, Sports, Science and Technology, Principal investigator, Competitive research funding
• 北海道に侵入したアズマヒキガエルが水域の生物 群集に与える影響
  THE ASAHI GLASS FOUNDATION RESEARCH GRANT
  Apr. 2017 - Mar. 2020
  Osamu Kishida
  THE ASAHI GLASS FOUNDATION, Principal investigator, Competitive research funding
• 北海道に侵入した強毒性ヒキガエルのインパクト
  The Mitsui & Co. Environment Fund
  Apr. 2017 - Mar. 2020
  Osamu Kishida
  MITSUI & CO., LTD., Principal investigator, Competitive research funding
• Comprehensive understanding of dynamics of parasite infection and communities in seasonally linked ecosystems
  Grants-in-Aid for Scientific Research
  01 Apr. 2015 - 31 Mar. 2018
  SATO Takuya; HIURA Tsutomu; KISHIDA Osamu; UTSUMI Syunsuke
  In this research project, we examined the causes and consequences of temporal variation in subsidies in stream and riparian ecosystems. A large-scale monitoring revealed that phenological diversity of arthropods and their nematomorph parasites synergistically determined the duration and seasonal timing of the riparian subsidies into streams. A field experiment then revealed that the pulsed subsidy allowed salmonid fish grow more evenly among individuals, which had different cascading effects on benthic invertebrates and leaf breakdown rate compared with the prolonged subsidy. In another experiment, fish exhibited a higher numerical response to the early subsidy, but not to the late subsidy, with the timing-dependent life history adoptions and its diversity. By using these empirical results, two modeling approaches highlight underappreciated roles of phenological variation in the assemblages of across-habitat consumer and resource movements in driving community and disease dynamics.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Kobe University, 15H04422
• Absorption of dissolved amino-acid by aquatic vertebrates from environmental water
  Grants-in-Aid for Scientific Research
  01 Apr. 2014 - 31 Mar. 2016
  KISHIDA Osamu; KOBAYASHI Makoto
  Aim of this study is to suggest a possibility of dissolved-amino-acid-usability for aquatic animals, by using larvae of Hynobius retardatus salamanders. As a result of multiple experiments, we show that the salamander larvae took in nitrogen from dissolved amino acids, and promoted their growth when they were kept in environmental water added to amino acids. Until now, aquatic prokaryotes such as bacteria are known to absorb dissolved amino acids directly from environmental water as an energy source for population growth. However, it has been assumed that aquatic vertebrates do not utilize them. The present finding may require the conventional view about energy flow in aquatic systems to be revised.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 26650152
• Phenotypic Plasticity: integrative study of ecology and molecular developmental biology
  Grants-in-Aid for Scientific Research
  01 Apr. 2011 - 31 Mar. 2016
  Nishimura Kenya; MIURA Toru; KISHIDA Osamu; MICHIMAE Hirofumi; KITANO Jun
  The Hokkaido salamander (Hynobius retardatus) is an endemic species inhabiting in Hokkaido Japan. Larvae of the Hokkaido salamander exhibit phenotypic plasticity that associate with defense against predators, offense to prey and conspecific larvae. The larval phenotypic plasticity is an eligible phenomenon for the integrative study of evolutionary ecology and molecular developmental biology.
  In this project, I tried to investigate, (1) morphological changes associated with the phenotypic plasticity by geometric morphometric analysis, (2) the genomic information about the morphological changes with the phenotypic plasticity by a RNAseq analysis, and (3) variations of morphology and morphological changes (developmental reaction norm) and microsatellite polymorphism among five local populations in the whole distribution area of the endemic species.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 23247004
• Environment-dependent trade-offs and limits of phenotypic plasticity
  Grants-in-Aid for Scientific Research
  2011 - 2013
  MICHIMAE Hirofumi; KISHIDA Osamu
  In nature, organisms constantly face multiple environments, and the expression and magnitude of the costs of plastic traits is occasionally context-dependent; therefore, the costs need to be analyzed across multiple environments. We determined the benefits and costs of two plastic responses (predator- and prey-induced morphologies) of larvae of the salamander Hynobius retardatus on larval survival, metamorphic timing, and body size at metamorphosis in three different environments by using frog tadpoles, predatory dragonfly larvae, or no inducer (conspecific larvae only). The benefits of plastic responses were detected in the inducing environments, but the costs were greater or more easily detected in crossover environments, such as those containing tadpoles or dragonfly larvae. The trade-offs appeared in combinations in the crossover environments, and thus were context-dependent.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Kitasato University, 23570036
• Ecological consequences of intra-population trait variation
  Grants-in-Aid for Scientific Research
  2012 - 2012
  KISHIDA Osamu
  Individuals are not uniform even within a species. Using a forest pond community as a model system, I experimentally explored ecological consequences of intra-population trait variation in a predator and prey species. I found that Intra-population trait variation of predator (Hynobius retardatus, salamander larvae) and prey (Rana pirica, tadpoles) species strongly dictate structure of inter-specific interactions through occurrence of intra-specific interaction such as cannibalism and apparent competition. Importantly, such effects translate into impacts on demography and evolution of community members and material flow within and between ecosystems. This study generally highlights that incorporating trait variation within a species into community ecology is imperative to deepen our understanding of dynamics and function of ecological community in nature.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 24370004
• Effects of population dynamics and dispersal on the formation of spatial genetic structure in gray-sided vole populations
  Grants-in-Aid for Scientific Research
  2010 - 2012
  SAITOH TAKASHI; KISHIDA Osamu; ISHIBASHI Yasuyuki
  Since most populations long sustain themselves in their mutual interaction, the knowledge about the population structure is essential to understand a mechanism of their sustainability. In this study I investigated the structure of a rodent population for 4 years taking their dynamics (genetic drift) and dispersal (gene flow) into consideration. The main results are as follows: (1) A scale of gene flows differed between sexes. Females' scale (500 m) was smaller than males' (2000 m); (2) The spatial structure differed between mtDNA-based and microsatellite DNA-based structure. A microsatellite DNA-based population included several mtDNA-based populations; (3) Effects of population dynamics was significant in females. Effects of genetic drift dominated over those of gene flow in a low density year.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Coinvestigator not use grants, Competitive research funding, 22370006
• Ecological impacts of trait-mediated interaction between predator and prey
  Grants-in-Aid for Scientific Research
  2010 - 2011
  KISHIDA Osamu
  Ecological consequences of inducible offense and defense are explored using predator Hynobius retardatus salamander larvae and prey Rana pirica frog tadpoles. We experimentally demonstrated that the antagonistic inducible responses of the predator and prey impact on population dynamics of prey tadpoles and life history of both species. We also found that the modification of the population level effects affect abundance of invertebrate community and ecosystem function
  Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, Principal investigator, Competitive research funding, 22770011
• 個体の可塑性と生物群集との相互関係の実証:両棲類幼生の形態変化に注目して
  科学研究費補助金(若手研究(スタートアップ), 研究活動スタート支援)
  2009 - 2010
  岸田 治
  変化する生物群集のなかで生物個体は形質をどのように変えるのか?その結果として個体群や群集レベルでどのような帰結がもたらされるのか?個体の応答性と高次の生態学的要素との相互関係の理解は、表現型可塑性研究の新しいムーブメントである。平成21年度は、1.この未開の領域において優先的に取り組まれるべき課題を明らかにするため、捕食者-被食者系の表現型可塑性に関する最近の研究の論点と成果をまとめた。その結果、(1)3種以上の相互作用系での個体の形質変化、(2)複数の誘導形質間の発現・機能上の関係性、(3)捕食者の可塑性による相互作用強度の変更、(4)捕食者と被食者の対抗性とその生態学的な影響、等のトピックについての理解が不足していることがわかった。そこでこれらについて理論的・実証的に研究する方法を提案した(以上は、総説論文として、Population Ecology誌に公表した)。2.次にトピック(4)に関する理論的研究を行った。捕食者と被食者の対抗的な可塑性の進化動態と個体群動態を数学的にモデル化し解析したところ、被食者が効果的な防御をもつときに捕食者と被食者の対抗的な可塑性が共進化しやすく、2種の個体群動態が安定的に持続することが分かった。3.最後に、個体の可塑性の群集生態学的影響を定量的に評価するためのモデル実験系を確立した。報告者はこれまでに可塑性研究の有効なモデル系として、エゾ...
  文部科学省, 若手研究(スタートアップ), 研究活動スタート支援, 北海道大学, Principal investigator, Competitive research funding, 21870001
• 捕食者と被食者の適応的な形態変化:表現型の可塑性と生物群集をつなぐ
  科学研究費助成事業
  2007 - 2008
  岸田 治
  捕食者-被食者相互作用における表現型可塑性の適応的機能と個体群生態学的意義についての理解を深めるため、エゾアカガエル幼生とエゾサンショウウオ幼生をモデルとした実験研究と、数理モデルを用いた理論研究を行った。
  1.種内の捕食-被食関係における対抗的形態可塑性の発見:エゾサンショウウオ幼生の高密度個体群が形態的二型を示すことを野外調査と野外操作実験で明らかにした。二型が共食い相互作用における対抗的表現型であること、つまり共食いに有利な型と、防御に機能する型からなることを実験的に示し、種内の食う-食われる関係で、個体が対抗的な形態可塑性を示すことを証明した。
  2.捕食者を共有する被食者2種の形質介在型の間接相互作用の検証:エゾアカガエル幼生とエゾサンショウウオ幼生の形態可塑性を実験的に操作し、2種の被食者が防御を発現することで、捕食者の摂餌選択性をかえ、互いの被食率を増加させていることを示した。
  3.共食いと体サイズ構造のフィードバック関係の検証:動物集団における共食いと集団中のサイズ構造の関係について、エゾサンショウウオ幼生の孵化コホートを対象として実験的に調べた。集団中の共食い頻度が、表現型可塑性による個体の形態的サイズ分化に強く依存すること、一方で、共食いが形態的サイズ分化を強化することを示した。さらに、共食い-サイズ構造の動的な相互作用が捕食者の存在下では生じにくいことを明らかにし、密度依存的な個体群動態の時間的・空間的変異について新しい説明を加えた。
  4.捕食者と被食者の適応的な表現型可塑性と個体群の安定性についての数理解析:数理モデルにより、個体群動態を安定化する捕食者と被食者の表現型可塑性の特徴について分析した。捕食者と被食者の表現型可塑性の機能が相互対抗的な場合に個体群が存続しやすく、特に被食者が優れた防御形質を有するほど、この安定化が促進されることを示した。
  日本学術振興会, 特別研究員奨励費, 京都大学, 07J05644
• 表現型可塑性の共進化に関する実験生態学的研究
  科学研究費助成事業
  2005 - 2006
  岸田 治
  環境依存的な形態的可塑性について、エゾアカガエル幼生とそれを捕食するエゾサンショウウオ幼生をモデル生物とした野外調査・室内実験研究を行った。野外調査により、自然の池群集において2種の両生類幼生間の軍拡競争的形態発現がいくつかの環境条件下で生じていることを確かめた。カエル幼生に比べてサンショウウオ幼生のサイズが大きいとき、サンショウウオ幼生の密度が高いとき、他の相互作用種(上位捕食者や下位被食者)の密度が低いときに、2種の対抗的形態が強く発現する傾向にあった。これらの条件下では、サンショウウオ幼生による高い捕食圧が実現し、その結果として2種の形態反応が促進されていると考えられた。そこで、室内実験により、2種のサイズや密度、上位捕食者の存在の有無、下位のエサ生物量に応じて、2種の形態反応と2種の捕食-被食相互作用がどのように左右されるのか調べた。その結果、サンショウウオ幼生のサイズが大きいときや彼らの密度が高いときに、捕食されるカエル幼生の数が多く、生存個体の防御形態発現が強いことが明らかとなった。また、環境中に上位捕食者が存在するときやカエル幼生のエサ生物が多いとき、2種の捕食被食関係は緩和され、それに応じて対抗的な形態反応が抑制されていた。これらの結果は、エゾサンショウウオ幼生とエゾアカガエル幼生との間でみられる対抗的な形態変化は、2種の密接な相互作用が実現したときに発現されるものであり、それには生物群集内の他の生物種が深く関わっている可能性を示唆する。
  捕食者特異的な誘導形態発現とその柔軟性に関する最近の研究の成果を統合し総説としてまとめた。従来の捕食者誘導防御の進化条件に加えて、形態を一度変化させた後の柔軟性が可塑性の進化にとって重要であることを主張し、今後の研究の展望を述べた。
  日本学術振興会, 特別研究員奨励費, 北海道大学, 05J09035
• Evolutionary Ecology of Phenotypic Plasticity in Amphibian Larvae.
  Competitive research funding