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Reproductive interference between endemic Cobitis roach fishes: sympatric spawning and extinction risk triggered by changes of agricultural environments

Research Project

Project/Area Number 17K07273
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Conservation of biological resources
Research InstitutionThe University of Shiga Prefecture

Principal Investigator

Koh-Ichi Takakura  滋賀県立大学, 環境科学部, 准教授 (50332440)

Co-Investigator(Kenkyū-buntansha) 西田 隆義  滋賀県立大学, 環境科学部, 教授 (60208189)
中西 康介  滋賀県立大学, 環境科学部, 研究員 (90726746)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords固有種 / 絶滅危惧種 / 保全生態学 / 生物間相互作用 / 種間求愛 / 雑種形成 / 核DNA / 繁殖干渉の緩和 / 絶滅危惧種保全 / 繁殖干渉 / 2種の繁殖の同時性・同所性 / 野外調査 / CAPSマーカー / 人工繁殖 / 種間相互作用
Outline of Final Research Achievements

The aims of this study were to understand the mechanism that has drove Cobitis minamorii oumiensis, an endemic roach fish, into the threat of extinction and to submit some feasible plans to conserve the species. First, we showed that the juveniles were produced less in the years when the adults of the related species, C. magnostriata, were abundant at a spawning site. Second, our molecular biological study demonstrated that the C. magnostriata males courted C. minamorii oumiensis females and they hybridized. These facts supported that the reproductive interference, interspecific sexual interaction with female reproductive cost, existed between the two related species. In final, we made some modification of the spawning environment to create some paddy field-like pools that works as C. minamorii oumiensis specific spawning sites. The modification was made prior to the spawning season of 2018 and the densities of C. minamorii oumiensis juveniles increased at newly-created pools.

Academic Significance and Societal Importance of the Research Achievements

異なる種の間での配偶(求愛や送粉)が繁殖を阻害する現象である繁殖干渉は、近年になって実証研究が増加してきたものの、実際の保全に応用された例はなかった。本研究は、琵琶湖固有な絶滅危惧種のビワコガタスジシマドジョウについて、その減少要因が繁殖干渉であることをいくつかの調査・分析から明らかにし、さらにこの知見を応用した本種の保全策を提案・実施した。繁殖干渉というメカニズムを明らかにしたことから、具体的かつ検証可能な保全策を策定することができ、現在知られる唯一の繁殖地においてその有効性を確かめることができた。

Report

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

    (12 results)

All 2020 2019 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (9 results)

  • [Journal Article] Does simultaneous and sympatric reproduction between two native spined loaches lead to reproductive interference and local extinction?2018

    • Author(s)
      Morii Kiyohito、Nakano Mitsunori、Takakura Koh-Ichi
    • Journal Title

      Environmental Biology of Fishes

      Volume: 101 Issue: 9 Pages: 1407-1416

    • DOI

      10.1007/s10641-018-0787-2

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Age class structure of spawning populations of two endangered endemic striated spined loaches in Lake Biwa river system2018

    • Author(s)
      Morii Kiyohito, Takakura Koh-Ichi
    • Journal Title

      Jpn. J. Environm. Zool. Entomol.

      Volume: 29 Pages: 135-141

    • NAID

      40021784724

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Growth patterns of juveniles observed at a shared spawning site in two closely related species of spined loaches endemic to the Lake Biwa riverine system; Cobitis magnostriata and C. minamorii oumiensis2018

    • Author(s)
      Morii Kiyohito, Mitsuaki Nakano, Takayoshi Nishida, Takakura Koh-Ichi
    • Journal Title

      Jpn. J. Environm. Zool. Entomol.

      Volume: 29 Pages: 49-56

    • NAID

      130007590837

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 繁殖干渉を考慮した保全策の実施―スジシマドジョウ2種の繁殖場所分割―2020

    • Author(s)
      森井清仁, 北野大輔, 久岡知輝, 高倉耕一
    • Organizer
      第67回日本生態学会大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 近縁種との繁殖場所分割によるビワコガタスジシマドジョウの保全2019

    • Author(s)
      森井清仁・北野大輔・久岡知輝・高倉耕一
    • Organizer
      2019年度日本魚類学会年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 近縁種との相互作用から解放されたサンヨウコガタスジシマドジョウは繁殖時に利用する環境が拡大する2019

    • Author(s)
      森井清仁・北野大輔・金井亮介・高倉耕一
    • Organizer
      第31回日本環境動物昆虫学会年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 長寿は絶滅へのカウントダウン:絶滅が危惧されるスジシマドジョウ2種の年級群構成2019

    • Author(s)
      森井清仁・高倉耕一
    • Organizer
      第66回日本生態学会大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ビワコガタスジシマドジョウにおける繁殖個体群の高齢化と絶滅のリスク2018

    • Author(s)
      森井清仁・高倉耕一
    • Organizer
      第30回日本環境動物昆虫学会年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] スジシマドジョウ 2 種の種間関係ー資源競争?見かけの競争?繁殖干渉?2018

    • Author(s)
      森井清仁・中西康介・中野光議・高倉耕一
    • Organizer
      第65回日本生態学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 同所的に繁殖するスジシマドジョウ種群 2 種の対照的な繁殖成功2017

    • Author(s)
      森井清仁・中西康介・中野光議・高倉耕一
    • Organizer
      2017年度日本魚類学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] Extinction driven by reproductive interference between native species in field -a case study of two spined loaches-2017

    • Author(s)
      Kiyohito Morii, Mitsunori Nakano, Kosuke Nakanishi, Koh-Ichi Takakura
    • Organizer
      第33回個体群生態学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] スジシマドジョウ 2 種の保全地における危機と順応的管理2017

    • Author(s)
      森井清仁・中野光議・中西康介・高倉耕一
    • Organizer
      第29回日本環境動物昆虫学会年次大会
    • Related Report
      2017 Research-status Report

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

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