東シナ海におけるサブメソスケール渦が海洋生態系に及ぼす影響の評価

• Project Area: Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem
• Project/Area Number: 18H04917
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Research Institution: Ehime University
• Principal Investigator: 吉江 直樹 愛媛大学, 沿岸環境科学研究センター, 講師 (50374640)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 海洋生態系 / フロント渦 / 栄養塩 / 植物プランクトン / 物質循環 / 栄養塩動態 / サブメソスケール現象

Outline of Annual Research Achievements

一般的に、東シナ海黒潮域は、表層の栄養塩濃度が極めて低い貧栄養海域であることから、生物生産性が低く餌不足のために、魚類の仔稚魚には不適な環境と考えられてきた。しかし、この海域はサバ・アジなどの多獲性魚類の世界有数の産卵場でもあるという矛盾が知られている(Saito, 2019)。
本研究では、東シナ海黒潮域において、未解明な部分の多い黒潮フロント渦や陸棚縁辺で励起された内部波などのサブメソスケール（数～数十km規模)の擾乱現象が、海洋生態系に及ぼす影響を明らかにし、先の矛盾の解明に繋がるメカニズムを探ることを目的とした。
具体的には、近年実用化された高応答性光学式生物センサーを用いて、これまで難しかった栄養塩・植物プランクトン群集組成の高頻度・高解像度観測を実施した。
その結果、サブメソスケール擾乱に起因して亜表層において比較的強い乱流混合が生じ、有光層以深から有光層へと十分な量の栄養塩が供給され、衛星には捉えられない亜表層において大型植物の褐色藻と中型植物の緑藻が迅速に応答し、低次生態系構造が貧栄養的なものから富栄養的なものへシフトさせ、生物生産を促進させていることが明らかとなった。このことから、東シナ海黒潮域では、表層は貧栄養・低生物生産ながらも、頻繁なサブメソスケール擾乱により栄養塩が亜表層へ供給され生物生産が高まるために仔稚魚に十分な餌が供給され、世界有数の魚類産卵場を形成されている可能性を示唆した。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Oregon State University(米国)
• [Int'l Joint Research] University of Victoria/Institute of Ocean Sciences(カナダ)
• [Int'l Joint Research] NMEMC/NMDIS(中国)
• [Int'l Joint Research] KAIST/KIOST(韓国)
• [Int'l Joint Research] POI(ロシア連邦)
• [Journal Article] How a small reef in the Kuroshio cultivates the ocean (2021)
  • Author(s): Hasegawa D.、Matsuno T.、Tsutsumi E.、Senjyu T.、Endoh T.、Tanaka T.、Yoshie N.、Nakamura H.、Nishina A.、Kobari T.、Nagai T.、Guo X.
  • Journal Title: Geophysical Research Letters Volume: 印刷中 Issue: 7 Pages: 1-11
  • DOI: 10.1029/2020gl092063
  • NAID: 120007027029
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Phytoplankton growth and consumption by microzooplankton stimulated by turbulent nitrate flux suggest rapid trophic transfer in the oligotrophic Kuroshio (2020)
  • Author(s): Kobari Toru、Honma Taiga、Hasegawa Daisuke、Yoshie Naoki、Tsutsumi Eisuke、Matsuno Takeshi、Nagai Takeyoshi、Kanayama Takeru、Karu Fukutaro、Suzuki Koji、Tanaka Takahiro、Guo Xinyu、Kume Gen、Nishina Ayako、Nakamura Hirohiko
  • Journal Title: Biogeosciences Volume: 17 Issue: 9 Pages: 2441-2452
  • DOI: 10.5194/bg-17-2441-2020
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 生態系モデルを用いた環境変化に伴う生態系応答の理解と予測に向けて (2020)
  • Author(s): 吉江直樹
  • Journal Title: 環境情報科学 Volume: 49(1) Pages: 21-27
  • Peer Reviewed
• [Journal Article] Trophic sources and linkages to support mesozooplankton community in the Kuroshio of the East China Sea (2020)
  • Author(s): Karu Fukutaro、Kobari Toru、Honma Taiga、Kanayama Takeru、Suzuki Koji、Yoshie Naoki、Kume Gen
  • Journal Title: Fisheries Oceanography Volume: 29 Issue: 5 Pages: 442-456
  • DOI: 10.1111/fog.12488
  • Peer Reviewed / Open Access
• [Journal Article] Impact of microzooplankton grazing on the phytoplankton community in the Kuroshio of the East China sea: A major trophic pathway of the Kuroshio ecosystem (2020)
  • Author(s): Kanayama Takeru、Kobari Toru、Suzuki Koji、Yoshie Naoki、Honma Taiga、Karu Fukutaro、Kume Gen
  • Journal Title: Deep Sea Research Part I: Oceanographic Research Papers Volume: 163 Pages: 103337-103337
  • DOI: 10.1016/j.dsr.2020.103337
  • Peer Reviewed / Open Access
• [Journal Article] How the Kuroshio Current delivers nutrients to sunlit layers on the continental shelves with aid of near-inertial waves and turbulence (2019)
  • Author(s): Takeyoshi Nagai, Gloria Silvana Duran, Diego Andre Otero, Yasutaka Mori, Naoki Yoshie, Kazuki Ohgi, Daisuke Hasegawa, Ayako Nishina, Toru Kobari
  • Journal Title: Geophysical Research Letters Volume: na Issue: 12 Pages: 6726-6735
  • DOI: 10.1029/2019gl082680
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 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 (2019)
  • Author(s): 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
  • Journal Title: 沿岸海洋研究 Volume: 57(1) Pages: 65-72
  • NAID: 130007841837
  • Peer Reviewed
• [Journal Article] センサによる硝酸塩鉛直乱流拡散フラックスの計測 (2019)
  • Author(s): 長谷川大介、田中雄大、松野健、千手智晴、堤英輔、中村啓彦、仁科文子、小針統、吉江直樹、郭新宇、長井健容、奥西武、安田一郎
  • Journal Title: 沿岸海洋研究 Volume: 57(1) Pages: 59-64
  • NAID: 130007841838
  • Peer Reviewed
• [Journal Article] Moon jellyfish aggregations observed by a scientific echo sounder and an underwater video camera and their relation to internal waves (2019)
  • Author(s): Mano Takashi、Guo Xinyu、Fujii Naoki、Yoshie Naoki、Tsutsumi Eisuke、Saito Rui
  • Journal Title: Journal of Oceanography Volume: 75 Issue: 4 Pages: 359-374
  • DOI: 10.1007/s10872-019-00507-8
  • NAID: 40021950632
  • Peer Reviewed
• [Journal Article] One-Dimensional Turbulence-Ecosystem Model Reveals the Triggers of the Spring Bloom in Mesoscale Eddies (2018)
  • Author(s): Marre E. R.、Ishizaka J.、Aiki H.、Mino Y.、Yoshie N.、Goes J. I.、Gomes H. R.、Tomita H.
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 123 Issue: 9 Pages: 6841-6860
  • DOI: 10.1029/2018jc014089
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Blending source of turbulence, upwellednutrients and primary producers in the Kuroshio flowing through the Tokara Strait (2020)
  • Author(s): T. Nagai, G. S. D. Gomez, T. Kobari, and N. Yoshie
  • Organizer: American Geophysical Union Fall Meeting 2020
  • Int'l Joint Research
• [Presentation] Effects of strong turbulent mixing on phytoplankton around the Tokara strait (2019)
  • Author(s): N. Yoshie, K. Ohgi, A. Kabe, T. Kobari, D. Hasegawa and J. Ishizaka
  • Organizer: 3rd International Symposium “Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem”
  • Int'l Joint Research
• [Presentation] Very strong turbulent mixing over 30-km and 200-m lateral and vertical scales in the Kuroshio near the continental slope in Hyuganada Sea (2019)
  • Author(s): Nagai, T., Duran, G. S., Otero, A. D., Mori, Y., Yoshie, N., Ohgi, K., Hasegawa, D., Nishina, A. and Kobari, T
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Mixing Processes in the Kuroshio region and their influence on the low-trophic ecosystem (2019)
  • Author(s): X. Guo, T. Matsuno, T. Senju, K. Ichikawa, T. Endoh, E. Tsutsumi, A. Nishina, H. Nakamura, J. Zhang, D. Hasegawa, N. Yoshie and T. Kobari
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Nutrient and phytoplankton dynamics in the continental slope region of the East China Sea associated with the Kuroshio frontal eddy (2019)
  • Author(s): N, Yoshie, A. Kabe, K. Ohgi, E. Tsutsumi, S. Takeda, J. Ishizaka and X. Guo
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Turbulent mixing and vertical nitrage flux in the Bungo Channel, Japan (2019)
  • Author(s): E. Tsutsumi, N, Yoshie, T. Mano, T. Kanda, N. Fujii and X. Guo
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Nutrient and phytoplankton dynamics in the continental slope region of the East China Sea associated with the Kuroshio frontal eddy (2019)
  • Author(s): 吉江直樹、加部晏諒、大城一輝、堤英輔、武田重信、石坂丞二、郭新宇
  • Organizer: 2019年度名古屋大学宇宙地球環境研究所研究集会「東シナ海の物質循環ならびに基礎生産に関わる物理・化学・生物過程」
• [Presentation] 東シナ海黒潮における微小動物プランクトンのエネルギー源と摂餌圧 (2019)
  • Author(s): 金山健、小針統、加留福太郎、鈴木光次、吉江直樹、久米元
  • Organizer: 2019年度 日本海洋学会 秋季大会
• [Presentation] 東シナ海黒潮におけるメソ動物プランクトンのエネルギー源と摂餌圧 (2019)
  • Author(s): 加留福太郎、小針統、金山健、鈴木光次、吉江直樹、久米元
  • Organizer: 2019年度 日本海洋学会 秋季大会
• [Presentation] トカラ海域から四国沖におけるプランクトン群集構造、現存量および生産力の変化 (2019)
  • Author(s): 数野真、小針統、金山健、加留福太郎、吉江直樹、長谷川大介、中村啓彦
  • Organizer: 2019年度 日本海洋学会 秋季大会
• [Presentation] How the Kuroshio enriches the southern coast of Japan and its downstream regions (2019)
  • Author(s): T. Nagai, S. Duran, D. Otero, N. Yoshie, K. Ohgi, D. Hasegawa, S. Clayton, Y. Uchiyama
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] Development and observational examples of measuring vertical turbulent nitrate flux using sensors (2019)
  • Author(s): D. Hasegawa, T. Tanaka, T. Matsuno, T. Senjyu, E. Tsutsumi, H. Nakamura, A. Nishina, T. Kobari, N. Yoshie, X. Guo, T. Nagai, T. Okunishi and I. Yasuda
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] ffects of strong turbulent mixing onphytoplankton around the Tokara Strait (2019)
  • Author(s): K. Ohgi, N. Yoshie, A. Kabe, T. Kobari, D. Hasegawa and J. Ishizaka
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] Estimation of temperature of seaweed bed vegetation boundary in the Bungo Channel of the Wester Seto Inland Sea using satellite SST (2019)
  • Author(s): A. Kabe, N. Yoshie, H. Shimabukuro and G. Yoshida
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] Trophic sources and feeding impacts of microzooplankton on phytoplankton community in the Kuroshio (2019)
  • Author(s): T. Kanayama, T. Kobari, F. Karu, K. Suzuki, N. Yoshie and G. Kume
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] Energy sources and feeding impacts of mesozooplankton community in the Kuroshio (2019)
  • Author(s): F. Karu, T. Kobari, Kh. Suzuki, N. Yoshie, T. Honma, T. Kanayama and G. Kume
  • Organizer: PICES 2019 annual meeting
  • Int'l Joint Research
• [Presentation] トカラ海峡周辺海域における強い乱流混合が植物プランクトンに及ぼす影響 (2019)
  • Author(s): 大城一輝, 吉江直樹, 加部晏諒, 小針統, 長谷川大介, 石坂丞二
  • Organizer: 第5回沿岸生態系の評価・予測に関するワークショップ
  • Int'l Joint Research
• [Presentation] 東シナ海におけるサブメソスケール渦が海洋生態系に及ぼす影響 (2018)
  • Author(s): 吉江直樹、大城一輝、加部晏諒、武田雄大、堤英輔、小針統、笹井義一、郭新宇
  • Organizer: 2018年度名古屋大学宇宙地球環境研究所研究集会「東シナ海の物質循環ならびに基礎生産に関わる物理・化学・生物過程」
• [Presentation] Responses of lower-trophic level marine ecosystem to various perturbations around Japan (2018)
  • Author(s): Yoshie, N., M. Nakagawa, H. Mizuguchi, T. Kanda, E. Tsutsumi, T. Kobari, Y. Sasai and X. Guo
  • Organizer: GEOTRACES-Japan International Workshop “BioGEOTRACES Japan begins”
  • Int'l Joint Research
• [Presentation] 貧栄養海域におけるフロント渦や乱流混合が海洋生態系に及ぼす影響 (2018)
  • Author(s): 吉江直樹・大城一輝・加部晏諒・中川美和・水口隼人・武田雄大・堤英輔・小針統・笹井義一・郭新宇
  • Organizer: OMIXサマースクール2018
  • Invited
• [Presentation] ffects of strong turbulent mixing on phytoplankton around the Tokara strait (2018)
  • Author(s): Yoshie, N., M. Nakagawa, H. Mizuguchi, T. Kanda, L. Mutou, E. Tsutsumi, T. Kobari and X. Guo
  • Organizer: PICES 2018 annual meeting
  • Int'l Joint Research
• [Presentation] Effects of nutrient enrichment on lower-trophic level ecosystem in the Tokara Strait (2018)
  • Author(s): Ogi, K., N. Yoshie, A. Kabe, E. Tsutsumi, T. Kobari, T. Kanayama, F. Karu, and T. Honma
  • Organizer: 2nd International Symposium “Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem”
  • Int'l Joint Research
• [Remarks] 愛媛大学教育研究者要覧
  • URL: http://yoran.office.ehime-u.ac.jp/profile/ja.ab4a92f1c65a0baa60392a0d922b9077.html