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Response of Energy flow in Algal bed Ecosystems against Ocean Acidification

Research Project

Project/Area Number 19H04234
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionUniversity of Tsukuba

Principal Investigator

Wada Shigeki  筑波大学, 生命環境系, 助教 (60512720)

Co-Investigator(Kenkyū-buntansha) 瀬戸 繭美  奈良女子大学, 自然科学系, 助教 (10512717)
AGOSTINI SYLVAIN  筑波大学, 生命環境系, 助教 (20700107)
今 孝悦  東京海洋大学, 学術研究院, 准教授 (40626868)
佐藤 雄飛  公益財団法人環境科学技術研究所, 環境影響研究部, 研究員 (50708120)
BENJAMIN HARVEY  筑波大学, 生命環境系, 助教 (70785542)
大森 裕子  筑波大学, 生命環境系, 助教 (80613497)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Keywords海洋酸性化 / CO2シープ / エネルギーフロー / 光合成 / 脱離 / 式根島 / 藻場
Outline of Research at the Start

本研究は海洋酸性化が藻場のエネルギーフローに及ぼす影響を評価するものであり、エネルギーフローの始点である光合成、高次栄養段階への2つの転送過程(生食連鎖と腐植連鎖)を解析し、それらの実験結果を基に海洋酸性化の影響を考慮した生態系モデルを構築するものである。これによって、海洋酸性化が生態系のメカニズムを撹乱する過程を定量的な観点から評価することが可能となる。

Outline of Final Research Achievements

We used the CO2 Sheep of Shikine Island to analyze the acquisition of energy through photosynthesis and the fate of the fixed energy. The photosynthetic production of the natural community obtained by deploying attachment substrates was significantly higher in high-CO2 areas, suggesting a fertilization effect on photosynthesis. On the other hand, there was no increase in algal biomass. One possible factor is that the process of algae detachment from the seafloor and transportation is enhanced, leading to the transfer of energy from coastal ecosystems to other ones. Furthermore, when comparing the algal community attached to the seafloor with the algae drifting away, the associated animal communities significant changed, indicating potential effects on higher trophic levels.

Academic Significance and Societal Importance of the Research Achievements

エネルギーフローの基盤となる光合成が増大する一方で、バイオマスが増大しないという結果は、エネルギーの移行経路が海洋酸性化で変化することを意味する。特に、藻類群集の変化から脱離の影響が示唆され、海藻藻場内だけでなく系外とのやり取りも含めてエネルギーの移行過程を解析する必要性が示された。また、海藻の葉上に付着する生物群集は脱離前後において大きく変化する。主に一次消費者と考えられる生物群集の変化は、海藻藻場における高次栄養段階生物へのエネルギー流の変化を示唆している。これらの成果は、エネルギーフローだけでなく、炭素循環における変容も示唆しており、ブルーカーボンなどへの影響も大きな懸念事項となる。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (7 results)

All 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Int'l Joint Research] Plymouth University(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Palermo(イタリア)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Ocean acidification increases phytobenthic carbon fixation and export in a warm-temperate system2021

    • Author(s)
      Wada Shigeki、Agostini Sylvain、Harvey Ben P.、Omori Yuko、Hall-Spencer Jason M.
    • Journal Title

      Estuarine, Coastal and Shelf Science

      Volume: 250 Pages: 107113-107113

    • DOI

      10.1016/j.ecss.2020.107113

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 二酸化炭素の増えた未来の海で生態系の変化を探る2022

    • Author(s)
      和田茂樹
    • Organizer
      第7回海中海底工学フォーラム・ZERO
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Assessment of bacterial decomposition of macroalgal organic matter based on thermal degradation2021

    • Author(s)
      Nanako Kawakami, Shigeki Wada
    • Organizer
      ASLO 2021 Aquatic Science Meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of ocean acidification on marine ecosystem services: use of natural analogues around volcanic CO2 vents2020

    • Author(s)
      和田茂樹
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of ocean acidification on marine ecosystem services: use of natural analogue around volcanic CO2 vents2020

    • Author(s)
      和田茂樹
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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