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Highly sensitive 14C analysis elucidating trophic ecology of endemic benthic fauna on hydrothermal vents

Research Project

Project/Area Number 19H03305
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 45040:Ecology and environment-related
Research InstitutionKumamoto University

Principal Investigator

Shimanaga Motohiro  熊本大学, くまもと水循環・減災研究教育センター, 教授 (70345057)

Co-Investigator(Kenkyū-buntansha) 渡部 裕美  国立研究開発法人海洋研究開発機構, 超先鋭研究開発部門(超先鋭研究プログラム), 准研究主任 (50447380)
野牧 秀隆  国立研究開発法人海洋研究開発機構, 超先鋭研究開発部門(超先鋭研究プログラム), 主任研究員 (90435834)
横山 祐典  東京大学, 大気海洋研究所, 教授 (10359648)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2019: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Keywords熱水噴出孔 / 炭素同位体比 / ベントス / 群集 / 栄養生態 / 放射性炭素同位体比
Outline of Research at the Start

①熱水噴出域(熱水域)に生息する微小底生動物(メイオベントス)の栄養源と栄養段階の多様性と、大型底生動物(マクロベントス)との被食‐捕食関係の解明
②熱水域底生生物各種の成長に伴う有機物源の変化の解明
本研究では、今まで未解明だった上記二つの研究課題をターゲットとし、従来の安定同位体比と、本研究の要となる14C分析を用いて、各分類群の化学合成有機物への依存度を正確に評価することにより、熱水域の化学合成細菌からメイオベントス、マクロベントスまで含めた「真」の栄養生態の多様性の評価と、栄養生態からみた熱水種の熱水進入過程の理解を目的とする。

Outline of Final Research Achievements

The trophic ecology of meio-macro and megafauna on hydrothermal vents (chimneys) and adjacent non-vent seafloor in seamounts along the Izu island arc and in the Okinawa Trough was analyzed using carbon and nitrogen stable isotope ratios and natural-abundance radiocarbon isotope ratios. The results showed that the dependences on hydrothermal-derived carbon dioxide and bottom-water carbon dioxide was different from habitats, indicating that hydrothermal fluid-derived environmental gradients around hydrothermal vents have a significant impact on the trophic ecology of the benthic organisms. Dependences on chemosynthetic organic matter are different even between closely related taxa inhabiting on the same chimney surfaces, and the dependence would not change with growth at least among juveniles settling on the chimneys.

Academic Significance and Societal Importance of the Research Achievements

本研究により、従来の安定同位体比分析だけでは細分化が困難だった、熱水固有底生生物の共生細菌を含んだ、熱水熱水域の主たる一次消費者である化学合成細菌の無機炭素源を放射性炭素同位体比分析によってより明確に分析可能であることを示し、これらの手法を用いて、熱水域底生生物群集の重要な構成要素でありながら、微小なため分類・生態学研究がすすんでいなかったメイオベントスの栄養生態の一端を明らかにしたことは、今後の熱水域生物群集の栄養生態および全貌解明の全貌解明の前進に大いに寄与すると自負する。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific2021

    • Author(s)
      Nakasugi Futa、Shimanaga Motohiro、Nomaki Hidetaka、Watanabe Hiromi Kayama、Kitahashi Tomo、Motomura Yusuke、Iseda Koki
    • Journal Title

      Journal of the Marine Biological Association of the United Kingdom

      Volume: 101 Issue: 6 Pages: 947-956

    • DOI

      10.1017/s0025315421000874

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distribution and Genetic Divergence of Deep-Sea Hydrothermal Vent Copepods (Dirivultidae: Siphonostomatoida: Copepoda) in the Northwestern Pacific2021

    • Author(s)
      Watanabe Hiromi Kayama、Senokuchi Reina、Nomaki Hidetaka、Kitahashi Tomo、Uyeno Daisuke、Shimanaga Motohiro
    • Journal Title

      Zoological Science

      Volume: 38 Issue: 3 Pages: 223-230

    • DOI

      10.2108/zs200153

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Stygiopontius senokuchiae (Dirivultidae, Copepoda), an endemic copepod species at deep hydrothermal vent sites, is biased to males2020

    • Author(s)
      Senokuchi R, Nomaki H, Uyeno D, Watanabe HK, Kitahashi T, Shimanaga M
    • Journal Title

      Journal of Oceanography

      Volume: - Issue: 5 Pages: 341-350

    • DOI

      10.1007/s10872-020-00548-4

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 熱水性カイアシ類Stygiopontius senokuchiaeの 成長に伴う形態・食性変化と齢構成の空間変異2021

    • Author(s)
      川谷健人, 野牧秀隆, 渡部裕美, 上野大輔, 嶋永元裕
    • Organizer
      日本甲殻類学会第59回大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 熱水性カイアシ類 Stygiopontius senokuchiae の成長にともなう形態変化と齢構成の空間変異2019

    • Author(s)
      川谷健人・嶋永元裕
    • Organizer
      日本甲殻類学会第57回大会
    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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