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Quantifying seasonal changes in structure and stability of lake food webs

Research Project

Project/Area Number 17K15056
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Conservation of biological resources
Research InstitutionNational Institute for Environmental Studies

Principal Investigator

Kadoya Taku  国立研究開発法人国立環境研究所, 生物・生態系環境研究センター, 室長 (40451843)

Project Period (FY) 2017-04-01 – 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 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords群集 / 食物網 / 生物多様性 / 安定性 / 生物群集 / 生態系機能 / キーストーン / 群集生態学 / 季節変動
Outline of Final Research Achievements

This study aimed to elucidate the seasonal changes in the structure and stability characteristics of the food web in Tonle Sap Lake, where the water level changes significantly between the dry and wet seasons. Analysis of stomach contents and nitrogen stable isotope ratios revealed that the trophic level of small piscivores, in particular, was lowered during the wet season. It was suggested that this trophic level decrease was due to the increase in the proportion of invertebrates and plant matter as diet. Furthermore, mathematical model analysis of the food web suggested that the trophic interactions between zooplankton and crustaceans tends to be destabilized, and that omnivorous fish species often play an important role in stabilizing this interaction.

Academic Significance and Societal Importance of the Research Achievements

栄養段階や雑食性は、生態系の安定性に大きく影響を与えることが知られている。本研究は、雑食性魚種がトンレサップ湖の生態系の安定性に重要な機能を果たしている可能性があること、さらに、このような栄養段階や雑食性が季節によって大きく変動する可能性を示した。これらの結果は、生態系の安定性を正しく理解し管理方策を考える上では、季節的な食物網の構造や特性の把握が欠かせないことを示している。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (14 results)

All 2021 2019 2018 Other

All Int'l Joint Research (6 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (4 results) (of which Invited: 2 results)

  • [Int'l Joint Research] University of Guelph/University of Toronto(カナダ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Toulouse(フランス)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Guelph(Canada)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Colorado State University(米国)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] University of Battambang(Cambodia)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2017 Research-status Report
  • [Journal Article] Consumer trophic positions respond variably to seasonally fluctuating environments2019

    • Author(s)
      McMeans Bailey C.、Kadoya Taku、Pool Thomas K.、Holtgrieve Gordon W.、Lek Sovan、Kong Heng、Winemiller Kirk、Elliott Vittoria、Rooney Neil、Laffaille Pascal、McCann Kevin S.
    • Journal Title

      Ecology

      Volume: 100 Issue: 2

    • DOI

      10.1002/ecy.2570

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bottom-up linkages between primary production, zooplankton, and fish in a shallow, hypereutrophic lake2018

    • Author(s)
      Matsuzaki Shin-ichiro S.、Suzuki Kenta、Kadoya Taku、Nakagawa Megumi、Takamura Noriko
    • Journal Title

      Ecology

      Volume: 99 Issue: 9 Pages: 2025-2036

    • DOI

      10.1002/ecy.2414

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Potential oscillators and keystone modules in food webs2018

    • Author(s)
      Kadoya Taku、Gellner Gabriel、McCann Kevin S.
    • Journal Title

      Ecology Letters

      Volume: 21 Issue: 9 Pages: 1330-1340

    • DOI

      10.1111/ele.13099

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Potential Oscillators and Keystone Modules in Food Webs2018

    • Author(s)
      Kadoya, T., Gellner, G., McCann, KS
    • Journal Title

      Ecology Letters

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 成層化した湖沼における生物の鉛直分布把握と環境要因との解析2021

    • Author(s)
      福森香代子, 今藤夏子, 高津文人, 土屋健司, 角谷拓
    • Organizer
      日本生態学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 陸域・陸水生態系への気候変動影響と適応2019

    • Author(s)
      角谷拓
    • Organizer
      第66回日本生態学会大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 日本陸水学会第83回大会2018

    • Author(s)
      角谷拓、鈴木健大、山口晴代、松崎慎一郎
    • Organizer
      次世代型生態系観測の展開と活用-群集生態学から気候変動モニタリングまで
    • Related Report
      2018 Research-status Report
  • [Presentation] 湖沼・流域の生態系の評価と保全2018

    • Author(s)
      角谷拓
    • Organizer
      第21回自然系調査研究機関連絡会議
    • Related Report
      2018 Research-status Report
    • Invited

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Published: 2017-04-28   Modified: 2022-02-21  

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