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Identification of coral spawn major source area in the Nansei Archipelago within the Kuroshio region for coral reef restoration

Research Project

Project/Area Number 17K00653
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental and ecological symbiosis
Research InstitutionKobe Gakuin University

Principal Investigator

Kashima Motohiko  神戸学院大学, 人文学部, 准教授 (10443251)

Co-Investigator(Kenkyū-buntansha) 内山 雄介  神戸大学, 工学研究科, 教授 (80344315)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsサンゴ卵重要供給源特定 / サンゴ卵輸送 / サンゴ礁保全 / 島嶼間サンゴ接続性 / 石西礁湖 / 南西諸島 / 鳩間島 / 黒潮 / サンゴ卵輸送重要供給源特定 / サンゴ生息域北進支援 / サンゴ卵 / 数値モデル / ブイ観測 / コネクティビティ / 沖縄 / サンゴ / 海洋保全 / 海洋物理・陸水学 / 生態系修復・整備 / 民俗学 / 環境
Outline of Final Research Achievements

A surface particle tracking simulation of coral spawn and larvae with drifter observation was used to identify the inter-island connectivity of the coral spawn in the Nansei archipelago during its life span and the coral spawn major source areas for coral reef restoration. The northern coastal zone of the Iriomote Island, including the Hatoma Island, was identified as a major source area for both cases: (1) From the Japan’s largest coral lagoon in the Kuroshio upstream region called the Yaeyama islands, the exterior and interior Sekisei lagoon, to the Kuroshio downstream region in the Nansei archipelago including the Okinawa main island, and (2) from the exterior Sekisei lagoon to the interior. Additionally, there are hearty and sustainable coral reef conservation activities realized from the questionnaire survey and hearing investigation in the Ishigaki island.

Academic Significance and Societal Importance of the Research Achievements

海洋生態系や人間社会を支えるサンゴ礁は近年世界的に白化現象の被害を受けており、温暖化等の気候変動との関連が示唆されている。日本では1998年に沖縄本島、2016年に石西礁湖が大被害を受けた。サンゴはサンゴ卵が輸送されて岩盤に定着することで再生するため、極向き海流である黒潮の上流域に位置する日本最大のサンゴ礁がある八重山諸島からのサンゴ卵の重要供給源を特定し保護することは、沖縄本島を含む南西諸島全域のサンゴ礁再生や温暖化時代におけるサンゴ生息域の北進支援に大きな役割を果たすことが期待される。今回得られた知見はサンゴ礁保護区指定に有効であり、特に鳩間島を始めとした海域の保護区指定が早急に望まれる。

Report

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

    (8 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Influences of the Kuroshio on Interisland Remote Connectivity of Corals Across the Nansei Archipelago in the East China Sea2018

    • Author(s)
      Yusuke Uchiyama, Sachika Odani, Motohiko Kashima, Yuki Kamidaira, Satoshi Mitarai
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 123 Issue: 12 Pages: 9245-9265

    • DOI

      10.1029/2018jc014017

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 琉球諸島周辺海域における生態系ネットワーク形成に対する黒潮の影響について2017

    • Author(s)
      小谷瑳千花、内山雄介、鹿島基彦、上平雄基、御手洗哲司
    • Journal Title

      土木学会論文集B2(海岸工学)

      Volume: 73

    • NAID

      130006171667

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Identification of coral spawn supply source for restoration of the Sekisei Lagoon within the Kuroshio region2019

    • Author(s)
      Motohiko Kashima, Naoya Takeda, Sachika Odani, Yusuke Uchiyama, Yuki Kamidaira, Satoshi Mitarai
    • Organizer
      AGU Fall Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Enhancement of interisland coral connectivity by the Kuroshio across the Nansei Archipelago, the East China Sea2018

    • Author(s)
      Yusuke Uchiyama, Sachika Odani, Motohiko Kashima, Yuki Kamidaira, Satoshi Mitarai
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 石西礁湖周辺海域から石西礁湖内部へのサンゴ卵輸送の研究2018

    • Author(s)
      武田尚弥、鹿島基彦、小谷瑳千花、内山雄介
    • Organizer
      日本サンゴ礁学会第21回大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 石西礁湖周辺海域から黒潮下流域へのサンゴ卵輸送の研究2017

    • Author(s)
      武田尚弥、鹿島基彦、小谷瑳千花、内山雄介
    • Organizer
      日本海洋学会2017年度秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Impact of the Kuroshio on dispersal of coral spawn and larvae around Ryukyu Islands in the East China Sea2017

    • Author(s)
      Sachika Odani, Yusuke Uchiyama, Motohiko Kashima, Yuki Kamidaira and Satoshi Mitarai
    • Organizer
      14th Annual Meeting AOGS 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 石垣-西表島海域から黒潮下流域へのサンゴ卵輸送過程の研究2017

    • Author(s)
      鹿島基彦、内山雄介、小谷瑳千花、武田尚弥
    • Organizer
      神戸学院大学人文学部研究推進費研究発表会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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