Kagoshima University · Division of Fisheries Sciences, School of Agriculture, Fisheries and Veterinary Medicine · 助教

Research keywords群集動態・端脚目・ヨコエビ・生態学的機能・藻場・Amphipoda・food web

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• Kobari T., Kominato N., Ishimaru R., Kodama M., Kume G., Hanai M., Nitta A., Kabeya N. . Fatty acid contents and its compositions of mesozooplankton community in the Kuroshio Current and neigh2025 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Progress in Oceanography The Kuroshio Current and its neighboring waters are nursery grounds for the early life stages of migratory fish, despite poor food availability under oligotrophic conditions. Although recent findings suggest that standing stocks of mesozooplankton are not low and provide good prey availability for fish larvae, no information is available at their prey quality. Here, we investigated the spatial and temporal variations in the fatty acid content of mesozooplankton communities from transect lines across the Kuroshio to evaluate the nutritional quality of mesozooplankton as prey for fish larvae. We identified 5 saturated fatty acids (SFAs), 4 mono-unsaturated fatty acids (MUFAs), and 13 poly-unsaturated fatty acids (PUFAs) in the mesozooplankton community. Multivariate analysis demonstrated that fatty acid contents in mesozooplankton dry mass were more variable between the seasons than at the sites, with increasing SFA in summer. Long-chain PUFA (LC-PUFA) content, represented by arachidonic, eicosapentaenoic, and docosahexaenoic acids, was comparable between the Kuroshio and its neighboring waters. These LC-PUFA contents exhibited significant positive correlations with the relative abundance of Eucalanidae copepods and molluscans determined with metabarcoding analysis. These contents were also positively correlated with the fatty acid content of the haptophyte biomarker. Beaked sandfish larvae had higher LC-PUFA contents than those of Anguilliformes leptocephali. Multivariate analysis demonstrated that the fatty acid composition of omnivorous crustaceans, such as decapods and Eucalanidae copepods, was synchronized with that of beaked sandfish larvae. These findings suggest that the LC-PUFA contents of mesozooplankton communities accumulate in omnivorous crustaceans feeding on nano- to micro-sized phytoplankton and are transferred to planktivorous fish larvae. DOI： 10.1016/j.pocean.2025.103598 Scopus
• Kodama M., Ota M., Sugie T., Hachiya J. . Caged seaweed aquaculture as habitats for epifauna: A case study demonstrating the importance of cages rather than cultured seaweed . Aquacult2025 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Aquaculture Seaweed aquaculture can have various environmental effects, with the role of providing habitat for surrounding organisms being of growing interest. Aquaculture systems typically consist of components such as ropes, cages, and cultivated seaweed itself. Each component possesses distinct characteristics and attributes, potentially influencing its function as a habitat. However, limited research has explored the differences in habitat provision among these various components. We conducted a field experiment to assess the habitat function of a seaweed aquaculture system involving a red alga Solieria pacifica, comparing the effects of ropes, cages, and cultured seaweed. Three treatments were tested: (1) a rope suspended without additional structure, (2) a rope suspended with an empty cage, and (3) a rope suspended with a cage containing cultured seaweed, representing the typical aquaculture setup. In all the treatments and sampling months, epifaunal assemblages are generally predominated by tube-dwelling amphipod crustaceans. Epifaunal abundance and diversity were significantly greater in the treatment with the rope and empty cage compared to the rope-only treatment, suggesting that cages provide an important habitat for epifauna. Interestingly, there was no significant difference in epifaunal diversity or assemblage structure between treatments with and without cultured seaweed. Furthermore, epifaunal abundance was higher in the absence of seaweed, indicating that cultured seaweed had limited habitat function and may even deter some epifauna. This case study offers valuable insights, demonstrating that structurally complex cages can provide more significant habitats for epifauna than the cultivated seaweed itself, highlighting an important consideration in aquaculture design. DOI： 10.1016/j.aquaculture.2025.743145 Scopus
• Kodama M., Onduka T., Tanita I., Takahashi M., Sanda T., Iwasaki T., Yamada H. . Disturbance of epifauna in seagrass-seaweed mixed beds by pesticides discharged into the coastal area: Asymmetr2024 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Marine Pollution Bulletin Although pesticides are a cornerstone of modern agriculture, they are also known to be a major factor in the decline of biodiversity. Even pesticides applied in inland agricultural areas can be transported via rivers and have often been detected in marine environments. Pesticides would disturb not only the ecosystems around agricultural areas but also marine ecosystems, and there is a growing need for research on how pesticides affect marine environments. Recently, several pesticides have been detected at high concentrations in the coastal areas of Ishigaki Island, Japan, where seagrasses and seaweeds form important macrophyte bed ecosystems. To elucidate the effects of pesticides on the macrophyte bed epifauna, a field survey was conducted in the intertidal seaweed-seagrass mixed beds in Ishigaki Island. As a result of the survey, several pesticides were detected, including the highly toxic insecticide fipronil. The epifaunal abundance, taxon richness and Shannon's diversity index (H′) were all negatively and significantly correlated with fipronil concentration. Crustaceans were found to be more affected by fipronil than molluscs. Abundance, taxon richness and H′ of crustaceans were negatively correlated with fipronil concentration, whereas those of molluscs were not. The alteration and decline of epifaunal assemblages by pesticides may lead to a loss of the ecological functions and resilience of macrophyte bed ecosystems. This study demonstrates the disturbance of epifauna by discharged pesticides in in situ coastal macrophyte bed ecosystems. Pesticides appear to disturb a much wider range of ecosystems than previously considered, and accordingly may require a reconsideration of pesticide use and discharge in the future. DOI： 10.1016/j.marpolbul.2024.117123 Scopus PubMed
• Kobari T., Manako Y., Hara A., Yamanoue K., Azuma T., Fukuda R., Wang Y.C., Kodama M., Kume G. . Community structure of fish larvae associated with advections of the Kuroshio and its neighbori2024 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Progress in Oceanography The Kuroshio has been long thought to be disadvantageous as nursery grounds for larval fishes due to the low plankton standing stocks under the oligotrophic conditions. Despite of the potential risk for survival and growth, early life stages of various fishes appear abundantly in the Kuroshio and its neighboring waters. Here, we report what kind of taxonomic groups establish community structure of larval fishes in the Continental shelf waters (CW) and the Kuroshio (KW). 16 orders and 78 families were classified in the present study. Mesopelagic fishes more abundantly appeared in the KW than in the CW, while larval fish abundance was not different between the two areas. Multivariate analysis demonstrated the regional difference of the taxonomic compositions, represented by Callionymidae, Bothidae, Labridae and Bregmacerotidae for the CW and Gonostomatidae, Myctophidae and Notosudidae for the KW. Abundance of fish larvae to ambient salinity exhibited significantly positive correlations for Gonostomatidae, Sigmops gracilis and Myctophum orientale predominated in the KW and negative correlations for Labridae appeared abundantly in the CW. These results suggest that mixture of advected specimens from the coastal and Kuroshio waters also contribute to larval fish community with high biodiversity and comparable abundance between the Kuroshio and its neighboring waters. DOI： 10.1016/j.pocean.2024.103386 Scopus

• 流下した農薬による島嶼沿岸生態系の撹乱実態の解明2025 · 配分額： 18850000円 （ 直接経費： 14500000円 、 間接経費： 4350000円 ）
• 流れ藻生態系の形成過程とそのメカニズムの解明2022 · 2022年4月 - 2024年3月
• 分布南限北上に伴うアマモ場の生物生産構造の変化：多年生群落の一年生化に着目して2022 · 配分額： 4550000円 （ 直接経費： 3500000円 、 間接経費： 1050000円 ）
• ウニ類に寄生するヨコエビ類の生態とその宿主ウニへの影響解明2020 · 資金種別： 競争的資金

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