研究者詳細 - 小針　統

論文 - 小針　統

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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 neighboring waters . Progress in Oceanography240 103598 - 103598 2025年10月

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

Kume G., Takahira H., Kodama M., Anraku K., Kotani T., Hirai J., Kobari T. . Analyses of gut content and isotopic composition of Japanese eel Anguilla japonica glass eels and elvers from an estuary in southern Japan . Marine Biology172 ( 8 ) 2025年7月

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 Biology

The Japanese eel, Anguilla japonica, is a commercially important fish species. Most eels intended for consumption are currently produced in aquaculture systems that rely exclusively on wild-caught glass eels. Studies on the diet of glass eels and elvers have been limited in the wild populations. In the present study, we evaluated the feeding habits of Japanese glass eels and elvers in the Sendai River estuary of southern Japan using morphological and DNA metabarcoding analyses of the gut contents as well as stable isotope analyses of glass eels and elvers. Among 80 glass eels, amorphous materials were observed in the guts of 11 glass eels using stereomicroscopy. The feeding intensity of glass eels increased with increasing water temperature. Various eukaryotes were detected by DNA metabarcoding analysis of the gut contents of glass eels. Planktonic and benthic organisms were identified in the guts of six of the 10 elvers. The carbon and nitrogen stable isotope values were significantly different between glass eels and elvers. Our results suggest that Japanese glass eels resume feeding mainly on detrital particulate organic matter after metamorphosis and start actively feeding on planktonic and benthic organisms after the elver stage.

DOI： 10.1007/s00227-025-04699-0

Scopus

その他リンク： https://link.springer.com/article/10.1007/s00227-025-04699-0/fulltext.html

Kobari T., Nakamura F., Kume G., Makino F., Habano A., Kodamatani H., Tomiyasu T. . Bioaccumulation of discharged mercury from submarine fumaroles due to copepod life history traits in northern Kagoshima Bay, Japan . Plankton and Benthos Research20 ( 2 ) 148 - 159 2025年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：日本プランクトン学会、日本ベントス学会

Kagoshima Bay is a deep and semi-enclosed embayment with submarine fumarolic activities. High mercury contents have occasionally been reported for some fishes and this was hypothesized to be due to a bioaccumulation of discharged mercury from the submarine fumaroles. However, there is still no information about how the discharged mercury is accumulated into fishes through the planktonic food web. Here, we demonstrate a bioaccumulation of discharged mercury through copepod life history adapted to the embayment. Calanus sinicus was a minor contribution to the numerical abundance of zooplankton communities in both surface and deep layers during summer. In the deepest basin in northern Kagoshima Bay, copepodite stage 5 of this copepod species concentrated occurred at high abundances below the thermocline throughout the day in summer. Zooplankton communities residing in the deep waters exhibited much lower protein synthetase activity than those in the surface waters, indicating low physiological activity. Metabar-coding analysis of their gut contents demonstrated that copepods, dinoflagellates and diatoms composed more than half of gut content DNA. Mercury contents were higher for all taxonomic groups of zooplankton in the deep layers compared with those in the surface layers. C. sinicus residing in the deep waters exhibited high mercury contents equivalent to carnivorous groups. These findings suggest that bioaccumulation of discharged mercury from submarine fumaroles is accelerated by aspects of this copepod’s life history such as lipid accumulation for dormancy after actively feeding on copepod fecal pellets and phytoplankton and dormant stock accumulation restricted to the deepest basin in northern Kagoshima Bay.

DOI： 10.3800/pbr.20.148

Scopus

CiNii Research

Matakiviti K.M., Harada Y., Kodama M., Kobari T., Komorita T., Kume G. . Feeding Habits of Blacktip Grouper Epinephelus Fasciatus Around Koshikishima Island, Southern Japan . Thalassas41 ( 2 ) 2025年5月

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：Thalassas

The blacktip grouper (Epinephelus fasciatus) is commercially important and serves as the top predator in reef ecosystems. Understanding its dietary habits is crucial for understanding its ecological role and informing conservation strategies. In this study, we investigated the dietary composition and feeding ecology of E. fasciatus to assess potential variation by size and season. From May 2022 to January 2024, 171 specimens were collected via line fishing around Koshikishima Island, Japan. We determined the key prey items through stomach content analysis and dietary contributions through stable isotope (δ<sup>15</sup>N and δ<sup>13</sup>C) analysis combined with a Bayesian mixing model (MixSIAR). Crabs, shrimp, and fish were the primary prey groups, with less contributions from polychaetes, starfish, and slipper lobsters. Shrimp was the primary food source for the latter and start of the year (October–December and January–March). Peak crab consumption occurred in the second (April–June) and third (July–September) quarters. The diet of the smaller class (≤ 300 mm) primarily comprised of crabs and shrimp, whereas that of the larger class (≥ 301 mm) was more diverse. However, permutational multivariate analysis of variance indicated no significant dietary variation by size or season. Stable isotopes indicated an increase in trophic levels with body size. Notably, crabs contributed approximately 95% of the diet in smaller individuals, whereas the contribution of shrimp and fish was slightly higher in larger individuals. These findings provide critical insights into the feeding ecology and role of E. fasciatus in reef ecosystems.

DOI： 10.1007/s41208-025-00866-8

Scopus

その他リンク： https://link.springer.com/article/10.1007/s41208-025-00866-8/fulltext.html

Kume G., Minagawa A., Shiozaki K., Jinno S., Hirai J., Ichinomiya M., Komorita T., Kodama M., Habano A., Kobari T. . Analyses of gut content and isotopic composition of Anguilliformes leptocephali near southern Japan . ICES Journal of Marine Science82 ( 5 ) 2025年5月

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：ICES Journal of Marine Science

Unlike most fish larvae that prey exclusively on mesozooplankton, such as copepods, leptocephali feed on a type of particulate organic matter (POM) known as marine snow. However, the components of POM consumed and assimilated by leptocephali have not been clarified to date. To characterize POM components ingested in the form of marine snow by leptocephali found in the waters around Satsunan, southern Japan, we performed morphological and DNA metabarcoding analyses of their gut contents and stable carbon and nitrogen isotope analyses for leptocephali and their potential food items. The analyses were carried out on the Dysomma, Gnathophis, and Muraenosox leptocephali, which occur abundantly in this area. Our data supported that leptocephali feed on marine snow particles, which can contain faecal pellets of copepods. The gut contents varied greatly among taxonomic groups of leptocephali. Differences in feeding depth and the transport of larvae from other regions may lead to differences in the leptocephali gut contents. Our results showed that the leptocephali of the Satsunan area did not actively use gelatinous zooplankton (i.e. cnidarians) and appendicularian houses, whose presence was frequently confirmed in leptocephali guts by former studies, as nutrient sources or as substrates to aggregate small particles such as bacteria, protozoans, and zooplankton faecal pellets. These results suggest that leptocephali feed non-selectively on marine snow in the ambient water column.

DOI： 10.1093/icesjms/fsaf065

Scopus

山口篤, 小針統 . 日本プランクトン学会70周年記念シンポジウム「プランクトン学会の過去，現在，未来」開催報告 . 日本プランクトン学会報70 ( 2 ) 62 - 68 2023年8月

小針統 . 2021年日本プランクトン学会・ベントス学会合同大会報告 . 日本プランクトン学会報69 ( 1 ) 39 - 41 2022年2月

平井惇也, 小針統 . 「次世代プランクトン研究を開拓する新技術・方法論」プログラム . 日本プランクトン学会報69 ( 1 ) 45 - 46 2022年2月

小針統, 一宮睦雄, 小森田智大, 久米元 . Distribution and growth of jack mackerel Trachurus japonicus larvae in the north Satsunan area, southern Japan . Fisheries Science－ 2021年査読

久米元, 小針統, 一宮睦雄, 小森田智大 . Mesopelagic fish larvae do not compete with larvae of fishery-target species in the Osumi Strait according to morphological, DNA metabarcoding, and stable isotope analyses . Marine Biology－ 2021年査読

Toru Kobari, Yurie Kobari, Toshihiro Ichikawa, Yoshiyuki Kugita, Takumi Yoshida, Tomo Fujii, Satoshi Furuhashi, Takashi Yamamoto, Akimasa Habano, Ryuji Fukuda . Seasonal dynamics of microbial plankton community in Kagoshima Bay . Aquabiology31 37 - 44 2009年2月

小針統 . 聴覚障害を持つ学生に対する乗船実習の教育環境-現状における問題点とその改善-. . Memoirs of the Faculty of Fisheries, Kagoshima University56 99 - 102 2007年12月

Toru Kobari, Shiori Imamura, Ai Ueda, Akimasa Habano . Growth rate of predominant copepods in Kagoshima Bay - Estimation by artificial cohort method . Memoirs of the Faculty of Fisheries, Kagoshima University56 45 - 54 2007年12月

T. Ichikawa, T. Kobari, A. Habano, Y. Oyama and C. Soga . Seasonal variation of chlorophyll in Kagoshima Bay, Japan. . Bulletin of the Marine Biomedical Institute, Sapporo Medical University, School of Medicine6 15 - 19 2005年12月

Toru Kobari, Akimasa Habano, Toshihiro Ichikawa . Seasonal variations in phyto- and zooplankton biomass in Kagoshima Bay . Memoirs of the Faculty of Fisheries, Kagoshima University51 19 - 25 2002年12月

Toru Kobari, Tetsuhiro Aono, Naonobu Shiga . Relationship between observed and estimated chlorophyll a concentrations from the Secchi depth in the central subarctic Pacific . Bulletin of the Faculty of Fisheries, Hokkaido University50 171 - 174 1999年12月

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