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Considering the evolution and diversification of marine plankton from "photosymbiosis" -Verification by planktonic foraminifera-

Research Project

Project/Area Number 18K14507
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionChiba University (2020)
The University of Tokyo (2018-2019)

Principal Investigator

TAKAGI Haruka  千葉大学, 大学院理学研究院, 助教 (10785281)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords浮遊性有孔虫 / 光共生 / 多様化 / 進化 / 18S rDNA / 共生藻 / 18SrDNA / 光合成生理 / FRRF
Outline of Final Research Achievements

Photosymbiosis of planktonic foraminifera were investigated using active chlorophyll fluorometry and
18S rDNA analysis. Based on the various features related on photosymbiosis (symbiont possession rate, chlorophyll content, Fv/Fm and correlation coefficient of size-Chl relationship), a new conceptual diagram of photosymbiosis has been proposed. Seven taxa were identified as symbionts. The phylogenetic analysis of modern planktonic foraminifera showed that photosymbiosis has been established multiple times in different clades in the course of their evolutionary history.

Academic Significance and Societal Importance of the Research Achievements

海洋の動物プランクトンにとって,光共生(藻類との細胞内共生)は,貧栄養海域で生存していくために適応的な戦略である.本研究では,浮遊性有孔虫という単細胞動物プランクトンの光共生生態に着眼し,どれほどの種が,どんな共生藻を,どれくらい持ち,どれほど活発に光合成を行っているかを,徹底的に調べ上げた.本研究により,新規の光共生関係を多数見出したほか,進化の過程で光共生が独立に何度も獲得されてきたことが示唆され,光共生がプランクトンの多様化に貢献してきたことが示された.こうしたプランクトンの生態に関する知見は,地球環境変動に海洋生物がどのように応答するかを予測する際の基礎的な情報を提供してくれている.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (13 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] MARUM, University of Bremen(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Observation of asexual reproduction with symbiont transmission in planktonic foraminifera2020

    • Author(s)
      Takagi, H., Kurasawa, A., Kimoto, K.
    • Journal Title

      Journal of Plankton Research

      Volume: 42 Issue: 4 Pages: 403-410

    • DOI

      10.1093/plankt/fbaa033

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterizing photosymbiosis in modern planktonic foraminifera2019

    • Author(s)
      Takagi Haruka、Kimoto Katsunori、Fujiki Tetsuichi、Saito Hiroaki、Schmidt Christiane、Kucera Michal、Moriya Kazuyoshi
    • Journal Title

      Biogeosciences

      Volume: 16 Issue: 17 Pages: 3377-3396

    • DOI

      10.5194/bg-16-3377-2019

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera2019

    • Author(s)
      Meilland J.、Siccha M.、Weinkauf M. F. G.、Jonkers L.、Morard R.、Baranowski U.、Baumeister A.、Bertlich J.、Brummer G.-J.、Debray P.、Fritz-Endres T.、Groeneveld J.、Magerl L.、Munz P.、Rillo M. C.、Schmidt C.、Takagi H.、Theara G.、Kucera M.
    • Journal Title

      Journal of Plankton Research

      Volume: 41 Issue: 2 Pages: 127-141

    • DOI

      10.1093/plankt/fbz002

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Perspective on the response of marine calcifiers to global warming and ocean acidification?Behavior of corals and foraminifera in a high CO2 world “hot house”2019

    • Author(s)
      Kawahata Hodaka、Fujita Kazuhiko、Iguchi Akira、Inoue Mayuri、Iwasaki Shinya、Kuroyanagi Azumi、Maeda Ayumi、Manaka Takuya、Moriya Kazuyoshi、Takagi Haruka、Toyofuku Takashi、Yoshimura Toshihiro、Suzuki Atsushi
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 6 Issue: 1 Pages: 1-37

    • DOI

      10.1186/s40645-018-0239-9

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterizing photosymbiosis in modern planktonic foraminifera2019

    • Author(s)
      Takagi Haruka、Kimoto Katsunori、Fujiki Tetsuichi、Saito Hiroaki、Schmidt Christiane、Kucera Michal、Moriya Kazuyoshi
    • Journal Title

      Biogeosciences Discussions

      Volume: 0 Pages: 1-32

    • DOI

      10.5194/bg-2019-145

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 浮遊性有孔虫の無性生殖と共生藻の垂直伝播2021

    • Author(s)
      高木悠花,倉沢篤史,木元克典
    • Organizer
      日本古生物学会第170回例会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 浮遊性有孔虫の光共生性に影響する環境要因の特定2020

    • Author(s)
      高木悠花,齊藤宏明
    • Organizer
      日本海洋学会 2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 浮遊性有孔虫の光共生の究明2020

    • Author(s)
      高木悠花,木元克典,藤木徹一,齊藤宏明,守屋和佳
    • Organizer
      2020年日本プランクトン学会・ 日本ベントス学会合同大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 浮遊性有孔虫の光共生性と環境要因の関係解明2020

    • Author(s)
      高木悠花,齊藤宏明
    • Organizer
      地球環境史学会2020年年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Toward a better understanding of planktic foraminiferal proxies: Are they photosymbiotic or not?2019

    • Author(s)
      Takagi Haruka、Kimoto Katsunori、Fujiki Tetsuichi、Moriya Kazuyoshi、Saito Hiroaki
    • Organizer
      JpGU2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Uncovering the ecology of marine protistan zooplankton: Foraminiferal-algal symbiosis2019

    • Author(s)
      Takagi Haruka、Kimoto Katsunori、Fujiki Tetsuichi、Moriya Kazuyoshi、Saito Hiroaki
    • Organizer
      UTokyo-NTU Joint Conference 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Disclosing photosymbiosis in modern planktic foraminifers2018

    • Author(s)
      Haruka Takagi, Tetsuichi Fujiki, Katsunori Kimoto, Kazuyoshi Moriya, Hiroaki Saito
    • Organizer
      FORAMS2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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