研究者詳細 - 小針　統

論文 - 小針　統

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数野真, 加古真一郎, 中村啓彦, 山城徹, 仁科文子, 久米元, 小針統 . 高分解能沿岸海洋モデルの粒子追跡による黒潮への黒潮内側域水塊移流の評価 . 水産海洋研究86 135 - 165 2022年査読

Kobari T. . Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters . Scientific Reports11 ( 1 ) 23265 - 23265 2021年12月査読国際誌

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

Trophic sources and pathways supporting early life stages are crucial for survival of forage fishes recruiting around the oligotrophic and unproductive Kuroshio. However, information is limited for the Kuroshio planktonic food web and its trophodynamics because of its high biodiversity. Here, we explore trophic sources and linkages in the Kuroshio plankton community using metabarcoding analysis of gut-content DNA for 22 mesozooplankton groups. The major prey was dinoflagellates and calanoids for omnivorous groups, and calanoids and gelatinous organisms for carnivorous groups. Larvaceans and hydrozoans were the most frequently appeared prey for both omnivores and carnivores, whereas they were minor constituents of the available prey in water samples. Although calanoids overlapped as major prey items for both omnivores and carnivores because they were the most available, contributions from phytoplankton and gelatinous prey differed among taxonomic groups. Further analysis of the metabarcoding data showed that in addition to omnivorous copepods like calanoids, gelatinous groups like larvaceans and hydrozoans were important hubs in the planktonic food web with their multiple trophic linkages to many components. These findings suggest that gelatinous organisms are important as supplementary prey and provide evidence of niche segregation on trophic sources among mesozooplankton groups in the Kuroshio.

DOI： 10.1038/s41598-021-02083-8

Scopus

PubMed

Kume G. . Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan . Frontiers in Marine Science8 2021年10月査読

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：Frontiers in Marine Science

To evaluate the importance of the northern Satsunan area in southern Japan as a spawning and nursery ground for chub mackerel (Scomber japonicus), we investigated the early life history characteristics (e.g., larval distribution, feeding habits, and growth) of S. japonicus over five successive years. This area is considered the main habitat and spawning ground of the congeneric species, S. australasicus. Using polymerase chain reaction-restriction fragment length polymorphism analysis, we first confirmed that S. japonicus larvae were abundant in the northern Satsunan area, potentially representing a major spawning and nursery ground in the Japanese Pacific coastal area. The number of recorded larvae started to increase in 2016, corresponding to the population dynamics of the Pacific stock of the species, which has shown increasing trends in recent years. Morphological and DNA metabarcoding analyses of gut contents and stable isotope analysis showed that, in addition to copepods, the larvae fed substantially on appendicularians. The trophic pathway involving appendicularians might support the feeding habits of S. japonicus, promoting its coexistence with other dominant species. Both the instantaneous growth rate and daily specific growth rate were comparable to those in the southern East China Sea, which is the main spawning and nursery ground of the species. Our data strongly suggest that the northern Satsunan area has favorable conditions for sustaining high larval population densities, even during phases with high population numbers. Our results provide insights for the fisheries management for S. japonicus in the Japanese Pacific coastal area, especially during high-stock periods.

DOI： 10.3389/fmars.2021.725227

Scopus

Komorita T. . Spring phytoplankton blooms in the Northern Satsunan region, Japan, stimulated by the intrusion of Kuroshio Branch water . Estuarine, Coastal and Shelf Science259 107472 - 107472 2021年9月査読

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：Estuarine, Coastal and Shelf Science

The Kuroshio current greatly affects biological processes in coastal areas. The Kagoshima Bay has good spawning ground for major migratory fish, serves as an important feeding area for fish larvae, and is affected by the Kuroshio current; however, there is little information concerning the biological response to the Kuroshio intrusion in this location. During the mixing period, the Kuroshio current approaches the Kagoshima Bay and a density flow, consisting of surface inflow and bottom outflow, is generated. We hypothesize that the bottom water in the bay, having a high nutrient concentration, mixes with the surface layer when the water flows out of the bay and that this contributes to the high biological production at the bay mouth. In this study, we conducted a field survey of the water quality in March 2016 and, using a three-end member mixing model, examined whether the bottom water of the bay could be a nutrient source supporting the phytoplankton bloom in the bay mouth. We discuss the fate of the organic matter derived from the primary production promoted by a nutrient supply event. The results indicate that the N-based phytoplankton biomass represented less than 80% of the N uptake by the phytoplankton, as estimated by subtracting the measured nitrate concentration from the supplied nitrate concentration based on the mixing model, indicating that the phytoplankton bloom at the bay mouth was supported by the supply of bottom water from the bay. Based on the C/N molar ratio (6.4) calculated by C/chlorophyll a (Chl-a) and N/Chl-a in this study, the highest value of nitrogen uptake was 12 mg C m−3 d−1 in terms of the carbon assimilation. The feeding rate of the mesozooplankton was estimated to be 13.6 mg C m−3 d−1 using a physiological model. An analysis of the food web structure is required to assess the effects of feeding by mesozooplankton; however, most of the phytoplankton bloom caused by mixing could be efficiently transferred to mesozooplankton in this study area.

DOI： 10.1016/j.ecss.2021.107472

Scopus

Daisuke Hasegawa, Takeshi Matsuno, Eisuke Tsutsumi, Tomoharu Senjyu, Takahiro. Endoh, Takahiro Tanaka, Naoki Yoshie, Hirohiko Nakamura, Ayako Nishina, Toru Kobari, Takeyoshi Nagai, Xinｙu Guo . How a small reef in the Kuroshio cultivates the ocean . Geographical Research Letters48 ( 7 ) e2020GL092063 2021年6月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Geophysical Research Letters

Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an attached submersible ultraviolet nitrate analyzer while drifting from the upstream to the downstream of the reef. Flow separations and trains of Kelvin-Helmholtz billows (thickness = 60 m) are identified using a shipboard ADCP and an echo-sounder. The turbulence diffusivity associated with the vigorous turbulent mixing reaches up to O(10−1 m2 s−1), resulting in strong nitrate fluxes of O(1–103 mmol m−2 day−1). In addition, large differences between the upstream and downstream density profiles suggest a strong upwelling velocity of O(10−3 m s−1), as well as an upwelling nitrate flux of O(102 mmol m−2 day−1) in the entire subsurface layer.

DOI： 10.1029/2020GL092063

Scopus

Hasegawa Daisuke, Matsuno Takeshi, Tsutsumi Eisuke, Senjyu Tomoharu, Endoh Takahiro, Tanaka Takahiro, Yoshie Naoki, Nakamura Hirohiko, Nishina Ayako, Kobari Toru, Nagai Takeyoshi, Guo Xinyu . How a Small Reef in the Kuroshio Cultivates the Ocean . Geophysical Research Letters48 ( 7 ) e2020GL092063 2021年3月

記述言語：英語

[Abstract] / Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an attached submersible ultraviolet nitrate analyzer while drifting from the upstream to the downstream of the reef. Flow separations and trains of Kelvin-Helmholtz billows (thickness = 60 m) are identified using a shipboard ADCP and an echo-sounder. The turbulence diffusivity associated with the vigorous turbulent mixing reaches up to O(10^−1 m^2 s^−1), resulting in strong nitrate fluxes of O(1–10^3 mmol m^−2 day^−1). In addition, large differences between the upstream and downstream density profiles suggest a strong upwelling velocity of O(10^−3 m s^−1), as well as an upwelling nitrate flux of O(10^2 mmol m^−2 day^−1) in the entire subsurface layer. / 　 / [Plain Language Summary] / Vertical nitrate fluxes associated with flow-topography interactions around a small reef in the Kuroshio Current are quantified using state-of-the-art oceanographic instruments. When the flow passes over a shallow sill on the flank of the reef, the velocity differences between layers intensify, resulting in a substantial vertical overturning and mixing of the water column. This turbulent mixing causes the observed nitrate flux from deep water to reach a value among the highest observed worldwide. / 　 / [Key Points] / • Flow separations and trains of Kelvin-Helmholtz billows mix the water column around a small reef in the Kuroshio / • Doming of isopycnals/nitraclines suggests strong upwelling in the lee of the reef / • Turbulent nitrate fluxes reach up to O(10^3 mmol m^−2 day^−1)

CiNii Research

Hideaki Matsui, Taku Sasaki, Toru Kobari, Viliame Waqalevu, Kazuma Kikuchi, Manabu Ishikawa, Tomonari Kotani . DHA Accumulation in the Polar Lipids of the Euryhaline Copepod Pseudodiaptomus inopinus and Its Transfer to Red Sea Bream Pagrus major Larvae . Frontiers in Marine Science8 632876 2021年2月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers in Marine Science

The euryhaline copepod Pseudodiaptomus inopinus play important roles in coastal waters as vectors of docosahexanoic (DHA) and eicosapentaenoic (EPA) acids for larval fish. While DHA and EPA in polar lipids (PLs) are more effective for fish larval development than non-polar lipid forms (NLs), there is little knowledge how much these lipids are accumulated in copepods from microalgae and are effective for early development of fish larvae. We report PLs fatty acid profiles of P. inopinus fed DHA-poor microalgae and evaluate its significance as a food source for larvae development of Pagrus major, compared with DHA-enriched rotifers. Copepods and rotifers were fed a mixed diet of three algal species (Phaeodactylum tricornutum, Tisochrysis lutea, and Pavlova lutheri), in addition of DHA-supplemented Super Fresh Chlorella (SFC) for rotifers. Compared with SFC, the algal mixture had higher EPA but lower DHA. Copepods had higher DHA and EPA in total lipids than rotifers fed each diet. Copepod PLs were specifically enriched with DHA and their contents were higher than both rotifers. On the other hand, PLs EPA contents were comparable between preys, indicating that copepods selectively fortified the PLs. Fish culture experiment showed that larvae fed copepods had higher growth than those fed SFC-enriched rotifers. Principal component analysis for each organism fatty acid composition emphasized trophic modification of DHA by copepods toward larval fish. This study highlighted that P. inopinus contribute to enhanced growth of coastal larval fish by efficiently transferring DHA via copepod fatty acid metabolism.

DOI： 10.3389/fmars.2021.632876

Scopus

Akimasa Habano, Toru Kobari, Wataru Ohbayashi, Gen Kume . Feeding habits of the skinnycheek lanternfish Benthosema pterotum (Alcock, 1890) in Kagoshima Bay, southern Japan . Ichtyological Research68 164 - 170 2021年1月査読

en Kume, Toru Kobari, Junya Hirai, Hiroumi Kuroda, Tsutomu Takeda, Mutsuo Ichinomiya, Tomohiro Komorita, Maki Aita-Noguchi, Fujio Hyodo . Diet niche segregation of co-occurring larval stages of mesopelagic and commercially important fishes in the Osumi Strait assessed through morphological, DNA metabarcoding, and stable isotope analyses . Marine Biology168 ( 1 ) 2021年1月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Marine Biology

The Osumi Strait and its neighboring waters are major spawning grounds for commercially important small pelagic and coastal fish in the Pacific coastal area of Japan. Mesopelagic fish larvae are also abundant here, co-occurring with the larvae of commercial species. However, it is unknown whether these fish groups compete for prey. We examined the diet of four commercial fish groups (Engraulis japonicus, Trachurus japonicus, Triglidae spp., and Sebastiscus spp.) and two mesopelagic species (Sigmops gracilis, Myctophum asperum) during their larval stages to determine whether they had the same prey source. Morphological analysis and DNA metabarcoding of gut contents showed that the main prey species of all six fish groups were calanoid copepods. However, results from metabarcoding differed greatly from morphological analysis, showing that appendicularians were abundant in the guts of S. gracilis, M. asperum, and Sebastiscus spp. This may be because the methods differ in how they determine prey composition, with morphological analysis relying on counts of identifiable prey parts and metabarcoding being only a semi-quantitative method. In addition, appendicularians might be underestimated by metabarcoding analysis due to variation in genome size, copy number of target genes, and primer mismatches. Stable isotope analysis supported the importance of appendicularians as prey for S. gracilis, M. asperum, and Sebastiscus spp. Our results indicate that the two mesopelagic species and Sebastiscus spp. may compete for prey, but E. japonicus, T. japonicus, and Triglidae spp. occupy niches different from those of the two mesopelagic species. Our results imply that the trophic pathway via appendicularians may support the feeding of dominant mesopelagic species and enable coexistence with commercial species in the study area.

DOI： 10.1007/s00227-020-03810-x

Scopus

その他リンク： http://link.springer.com/article/10.1007/s00227-020-03810-x/fulltext.html

Yoshinaga S., Kobari T., Tanonaka N., Yamanoue K., Kume G. . Feeding habits of the mesopelagic fish Sigmops gracilis larvae in the Kuroshio and its adjacent water, southern Japan . Ichthyological Research68 ( 1 ) 171 - 176 2021年1月招待査読

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：Ichthyological Research

We examined the feeding habits of the dominant mesopelagic fish Sigmops gracilis larvae across the Kuroshio Current, southern Japan. The feeding incidence tended to decrease toward the offshore area. Copepods, amphipods, ostracods, and appendicularians were microscopically observed in the guts. Larvae fed substantially on copepods such as calanoids and appendicularians. Appendicularians were more frequently ingested toward the offshore area and were the most preferential prey item in all areas. The microbial production integrated by appendicularians would support mesopelagic fish larvae in addition to the ordinary trophic pathway through copepods.

DOI： 10.1007/s10228-020-00760-8

Scopus

Habano A., Kobari T., Ohbayashi W., Kume G. . Feeding habits of the skinnycheek lanternfish [Benthosema pterotum (Alcock, 1890)] in Kagoshima Bay, southern Japan . Ichthyological Research68 ( 1 ) 164 - 170 2021年1月

記述言語：日本語出版者・発行元：Ichthyological Research

We examined the feeding habits of Benthosema pterotum in Kagoshima Bay. Benthosema pterotum undertook diel vertical migration and preyed in shallow waters at night. The most frequently consumed prey were copepods, and B. pterotum selectively foraged on poecilostomatoids. Poecilostomatoids were more predominant in the Kagoshima Bay zooplankton community than in neighboring sites, which suggested that the B. pterotum preference for poecilostomatoids may be an adaptation by the local population to prey availability. Benthosema pterotum probably plays an important role as a biological pump contributor and as a mediator that links secondary production and higher trophic levels.

DOI： 10.1007/s10228-020-00758-2

Scopus

Takeru Kanayama, Toru Kobari, Koji Suzuki, Naoki Yoshie, Taiga Honma, Fukutaro Karu, Gen Kume . Impact of microzooplankton grazing on the phytoplankton community in the Kuroshio of the East China Sea: a major trophic pathway of the Kuroshio ecosystem . Deep-Sea Research I163 2021年査読

小針統, 久米元, 一宮睦雄, 小森田智大 . 北部薩南海域におけるジンベエザメの餌料源 . 日本プランクトン学会報－ 2021年査読

Fukutaro Karu, Toru Kobari, Taiga Honma, Takeru Kanayama, Koji Suzuki, Naoki Yoshie and Gen Kume . Trophic sources and linkages to support mesozooplankton community in the Kuroshio of the East China Sea . Fisheries Oceanography29 ( 5 ) 442 - 456 2020年9月査読

Shohei Yoshinaga, Toru Kobari, Norika Tanonaka, Kaori Yamanoue, Gen Kume . Feeding habits of the mesopelagic fish Sigmops gracilis larvae in the Kuroshio and its adjacent water, southern Japan . Ichtyological Research68 171 - 176 2020年6月査読

Toru Kobari, Taiga Honma, Daisuke Hasegawa, Naoki Yoshie, Eisuke Tsutsumi, Takeshi Matsuno, Takeyoshi Nagai, Takeru Kanayama, Fukutaro Karu, Koji Suzuki, Takahiro Tanaka, Xinyu Guo, Gen Kume, Ayako Nishina, Hirohiko Nakamura . Phytoplankton growth and consumption by microzooplankton stimulated by turbulent nitrate flux suggest rapid trophic transfer in the oligotrophic Kuroshio . Biogeosciences17 2441 - 2452 2020年5月査読

中野寛, 小針統, 山口敦子, 久米元 . 奄美大島におけるリュウキュウアユの食性 . 魚類学雑誌67 ( 2 ) 287 - 292 2020年査読

記述言語：日本語出版者・発行元：一般社団法人日本魚類学会

The diet of the critically endangered Ryukyu-ayu Plecoglossus altivelis ryukyuensis in the middle reaches of the Kawauchi, Sumiyo, and Yakugachi Rivers, Amami-oshima Island, southern Japan was examined by gut content analysis and inferred from stable isotope signatures. No clear differences in diet composition were apparent among the rivers. Microalgae, such as diatoms and cyanobacteria, generally considered as important food, were only rarely observed in gut contents, whereas detritus was almost exclusively found. However, stable isotope signatures indicated that detritus was not directly utilized as a nutritional source, indicating that food availability was an issue for P. a.ryukyuensis.

DOI： 10.11369/jji.20-030

CiNii Research

小針統, 山崎朱音, 遠藤有紀, 久米元, 小森田智大, 一宮睦雄, 幅野明正, 有田洋一, 牧野文洋 . 北部薩南海域におけるメソ動物プランクトン群集の時空間変動 . 海の研究29 ( 6 ) 217 - 232 2020年査読

担当区分：筆頭著者,　責任著者記述言語：日本語出版者・発行元：日本海洋学会

北部薩南海域におけるメソ動物プランクトン群集組成，現存量（個体数密度および生物量），タンパク質合成酵素活性の時空間変動を明らかにした。メソ動物プランクトン現存量では時間および空間変動の両方が，タンパク質合成酵素活性では時間変動が卓越した。メソ動物プランクトン群集中ではカラヌス目およびポエキロストム目カイアシ類が優占し，多変量解析では鹿児島湾口部で季節的に遷移する6系群，湾外の季節性に乏しい2系群に識別された。メソ動物プランクトン現存量は鹿児島湾外よりも湾口部で高かったが，タンパク質合成酵素活性は両海域で同等であった。タンパク質合成酵素活性は水柱平均クロロフィル a 濃度と明瞭な傾向を示さなかったが，個体あたりの体重が小さいほど高くなった。また，水柱平均塩分が低いほど個体あたりの体重が小さく，メソ動物プランクトン個体数密度は増加する傾向を示した。これらの結果から，北部薩南海域におけるメソ動物プランクトン現存量やタンパク質合成酵素活性の時空間変動は，低塩分水の移流もしくは伸展に伴う小型のカラヌス目およびポエキロストム目カイアシ類の流入の影響を受けていることが示唆された。

DOI： 10.5928/kaiyou.29.6_217

CiNii Research

Kanayama T. . Impact of microzooplankton grazing on the phytoplankton community in the Kuroshio of the East China sea: A major trophic pathway of the Kuroshio ecosystem . Deep-Sea Research Part I: Oceanographic Research Papers163 2020年査読

阿部美穂子, 小針統, 本間大賀, 金山健, 加留福太郎, 吉江直樹, 長谷川大介, 仁科文子, 内山正樹, 東隆文, 中村啓彦 . トカラ海峡上流域から下流域におけるプランクトン群集組成，現存量および生産力の変化 . 沿岸海洋研究57 65 - 72 2019年8月招待査読

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