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Further threat ,expansion of distribution of Hydrocotyle ranunculoides and Alternanthera philoxeroides ,

Research Project

Project/Area Number 17K00647
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MINAGAWA Tomoko  熊本大学, 大学院先端科学研究部(工), 准教授 (10355828)

Co-Investigator(Kenkyū-buntansha) 鬼倉 徳雄  九州大学, 農学研究院, 准教授 (50403936)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords特定外来生物 / ナガエツルノゲイトウ / ブラジルチドメグサ / 多様性 / 魚類 / 影響 / 対策 / 外来生物 / ブラジルチドメグ / ワンド・たまり / 高水敷掘削 / 氾濫原生態系 / ティラピア / 分布拡大要因 / 外来種対策 / 外来種 / 保全
Outline of Final Research Achievements

This study evaluated the distribution characteristics, distribution factors, and impacts on biodiversity of Hydrocotyle ranunculoides and Alternanthera philoxeroides, which are invasive alien species. In the Kikuchi River, it was shown that weirs were involved in the expansion of the distribution of Hydrocotyle ranunculoides, and that the distribution of A. philoxeroides was related to the bank slope, friction velocity, and soil moisture. We also quantitatively clarified that A. philoxeroides is the most dangerous species that is superior not only to native species but also to competition with other invasive alien species. Furthermore, it was shown that the overgrowth of A. philoxeroides and Pistia stratiotes contributed to the reduction of fish diversity. Based on these results, the points to be noted when excavating the flood channel and creating the artificial backwaters for flood plain ecosystem conservation were shown.

Academic Significance and Societal Importance of the Research Achievements

本研究は複数の外来種が在来の氾濫原依存種の減少や氾濫原生態系の変質を加速化させている現象を氾濫原生態系に対するさらなる脅威として位置づけ、ブラジルチドメグサとナガエツルノゲイトウに着目し、分布特性や拡大要因を、水理諸量、河川構造物、河岸形状などの要因を含め明らかにした。また、高水敷掘削などの人為的な改変との関連性を踏まえ、具体的な対策を提示した。これらの結果は、生態学、応用生態工学、河川工学領域への学術的な貢献と技術的な貢献が期待でき、日本における生物多様性の保全に寄与するものである。

Report

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

    (5 results)

All 2020 2019 2018

All Presentation (5 results)

  • [Presentation] 河川水辺の国勢調査を用いた国外外来魚の分布・拡大に関する基礎的研究2020

    • Author(s)
      山本瑞稀,皆川朋子,小山彰彦
    • Organizer
      令和元年度土木学会西部支部研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 江津湖における外来水草及び外来魚の拡大状況に関する現況評価2019

    • Author(s)
      蔵元辰也,皆川朋子,伊東麗子, 米満典子
    • Organizer
      平成30年度土木学会西部支部研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 有明海沿岸地域のクリーク網の魚類相:現在と過去を比較する2019

    • Author(s)
      鬼倉徳雄,一安美希,梅村啓太郎,若林瑞希,中島 淳,林 博徳,並木 崇(
    • Organizer
      2019年度日本魚類学会年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 江津湖における外来水草及び外来魚の拡大状況に関する現況評価2019

    • Author(s)
      蔵元辰也・皆川朋子・伊東麗子・米満典子
    • Organizer
      土木学会西部支部研究発表会
    • Related Report
      2018 Research-status Report
  • [Presentation] ブラジルチドメグサ・ナガエツルノゲイトウの分布特性と生物タヨ油性への影響評価2018

    • Author(s)
      上杉孝輔・伊東麗子・皆川朋子
    • Organizer
      応用生態工学会 九州地区事例発表会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2025-03-27  

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