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Evolution of male insect genitalia: Sperm removal in Euphaeidae damselflies

Research Project

Project/Area Number 16K07486
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biodiversity/Systematics
Research InstitutionTokyo Metropolitan University

Principal Investigator

HAYASHI Fumio  首都大学東京, 理学研究科, 教授 (40212154)

Research Collaborator PHAN Quoc Toan  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords精子競争 / 配偶行動 / 昆虫 / 性選択 / 交尾器 / アロメトリー / 形質置換 / 精子置換 / 行動生態学 / 進化
Outline of Final Research Achievements

Males of Euphaea (Euphaeidae) have bird wing like genitalia. Wing parts are slit in structure. Red ink enters through this slit structure when the tip of the left side of wings is toughed to a drop of red ink. The both wings are connected to each other at the central part, and red ink moves to the opposite (right) side of wings. This suggests that sperm removal may occur at copulation. The female sperm-storage organ is left-sided and the left side of male genital wings may be inserted into it to absorb rival sperm within the slit. Although based on small sample size, the amount of sperm in the female sperm-storage organ tend to be decreased when the copulation is interrupted before male sperm ejection.

Academic Significance and Societal Importance of the Research Achievements

昆虫類の交尾器は形態だけでなく機能的にも多様である.精子競争を避けるために,オスが交尾器を使ってすでにメスの体内に貯えられている他オスの精子を掻き出してから,自分の精子を渡すという「精子置換」という行動もオスの交尾器の機能の一つである.精子置換は,これまで,オスの交尾器にある微細な「棘」で精子を掻き出すか,交尾器の先端にある「かえし」構造で精子を掻き出すとされてきた.本研究において示唆された「毛細管現象を利用した精子の掻き出し」は,新たな精子置換モデルとして,今後この分野で大きな成果となるだろう.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (8 results)

All 2018 2017 Other

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

  • [Int'l Joint Research] Duy Tan University(ベトナム)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] 中国農業大学(中国)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Duy Tan University(ベトナム)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] 中国農業大学(中国)

    • Related Report
      2016 Research-status Report
  • [Journal Article] A synopsis of the Euphaeidae (Odonata: Zygoptera) of Vietnam, with descriptions of two new species of Euphaea.2018

    • Author(s)
      Phan, Q. T., Kompier, T., Karube, H. and Hayashi, F.
    • Journal Title

      Zootaxa

      Volume: 4375 Issue: 2 Pages: 151-190

    • DOI

      10.11646/zootaxa.4375.2.1

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] ミナミカワトンボ類のオスの翅の模様と交尾器にかかる性選択2018

    • Author(s)
      林文男
    • Journal Title

      昆虫と自然

      Volume: 53 Pages: 10-12

    • Related Report
      2017 Research-status Report
  • [Presentation] 性選択作用下での形質置換:ミナミカワトンボ類のオスの繁殖形質の地理的変異2017

    • Author(s)
      林文男
    • Organizer
      日本生態学会第64回大会
    • Place of Presentation
      東京都高田馬場
    • Year and Date
      2017-03-22
    • Related Report
      2016 Research-status Report
  • [Remarks] 首都大学東京帰国留学生短期研究支援制度平成30年度研究報告書

    • URL

      http://www.ic.tmu.ac.jp/files/about/furf_h30_03.pdf

    • Related Report
      2018 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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