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New Developments in Research on Land-Based Stressors Affecting Corals Considering Multiple Stress Factors

Research Project

Project/Area Number 22K14943
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Iijima Mariko  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 研究員 (20915483)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsサンゴ / 蓄積型栄養塩 / 底質 / リン酸塩 / 重金属 / 石灰質
Outline of Research at the Start

本課題は,申請者がこれまでに明らかにしたサンゴ稚ポリプの骨格形成をリン酸塩が直接阻害すること,石灰質の底質にリン酸塩が吸着し,蓄積している蓄積型栄養塩という知見を元に,「陸域負荷がサンゴの生育に及ぼす影響の実態解明」を目的とし,1)蓄積型栄養塩をはじめとする陸域負荷のより詳細な実態解明,2)底質に含まれる稚サンゴに対して急性毒性を有する物質の探索,3)リン酸塩が稚サンゴの骨格形成に及ぼす影響の分子機構の解明などの分析の3課題を実施する。

Outline of Final Research Achievements

Based on findings that phosphate directly inhibits the skeletal formation of coral polyps and accumulates in calcareous substrates, this study aimed to elucidate the impact of land-based stressors on coral growth. Specifically, the study focused on: 1) detailed analysis of land-based nutrient loads, including accumulated nutrients, 2) identification of acutely toxic substances in the substrate, and 3) elucidation of the molecular mechanisms by which phosphate affects skeletal formation. The research revealed high concentrations of adsorbed phosphate in areas like Sekisei Lagoon, where coral polyp skeletal formation and survival rates were found to decrease. Additionally, heavy metals were shown to negatively impact coral survival rates, and gene experiments confirmed a decrease in gene expression levels due to phosphate load.

Academic Significance and Societal Importance of the Research Achievements

本課題により陸域から海域への栄養塩や重金属の流入がサンゴ礁に与える影響を把握することで,陸域から海域への排出制限の閾値設定に貢献できるほか,石灰質の底質に吸着している蓄積型栄養塩においては陸域負荷の指標として用いることで環境保全政策の策定に貢献できることが期待される。このように沿岸域の陸域負荷のサンゴ礁生態系への実態を解明しサンゴ礁を保全するとともに,亜熱帯島嶼域における持続可能な地下水利用法を構築する上で欠かせない知見をもたらし,持続可能な社会システム構築の一助となるであろう。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Metagenomic analysis of the microbial communities and associated network of nitrogen metabolism genes in the Ryukyu limestone aquifer2024

    • Author(s)
      Maruyama Rio、Yasumoto Ko、Mizusawa Nanami、Iijima Mariko、Yasumoto-Hirose Mina、Iguchi Akira、Hermawan Oktanius Richard、Hosono Takahiro、Takada Ryogo、Song Ke-Han、Shinjo Ryuichi、Watabe Shugo、Yasumoto Jun
    • Journal Title

      Scientific Reports

      Volume: 14 Issue: 1

    • DOI

      10.1038/s41598-024-54614-8

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effective use of farmland soil samples for N and O isotopic source fingerprinting of groundwater nitrate contamination in the subsurface dammed limestone aquifer, Southern Okinawa Island, Japan2023

    • Author(s)
      Hermawan Oktanius Richard、Hosono Takahiro、Yasumoto Jun、Yasumoto Ko、Song Ke-Han、Maruyama Rio、Iijima Mariko、Yasumoto-Hirose Mina、Takada Ryogo、Hijikawa Kento、Shinjo Ryuichi
    • Journal Title

      Journal of Hydrology

      Volume: 619 Pages: 129364-129364

    • DOI

      10.1016/j.jhydrol.2023.129364

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Impact of Phosphate on Coral Skeletons and Introduction of Accumulated Phosphate as a Land-Based Stress Indicator2023

    • Author(s)
      飯島真理子
    • Organizer
      13th Asia Pacific Marine Biotechnology Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] リン酸塩のサンゴ骨格阻害機構の解明と新たな陸域負荷指標となる蓄積型リンの提唱2023

    • Author(s)
      飯島真理子
    • Organizer
      第23回マリンバイオテクノロジー学会大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 陸域由来のリン酸塩がサンゴに及ぼす影響の解明2023

    • Author(s)
      飯島真理子
    • Organizer
      第39回地質調査総合センターシンポジウム「美ら海の産業と環境の調和を科学の力でー陸‐沿岸‐海洋研究の最前線ー」
    • Related Report
      2022 Research-status Report
  • [Presentation] Effects of the pumice pebbles on the survival rate of juvenile corals especially focusing on pH and concentrations of metal ions dissolved into seawater.2022

    • Author(s)
      飯島真理子
    • Organizer
      Japan Geoscience Union Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Land-originated phosphates adsorbed to coastal calcareous sediments on coral reef ecosystem in Sekisei Lagoon, Japan2022

    • Author(s)
      飯島真理子
    • Organizer
      AGU Fall meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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