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Studies on local adaptation of larval growth pattern of insects introduced in high latitudes

Research Project

Project/Area Number 17H06901
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Ecology/Environment
Research InstitutionYamaguchi University

Principal Investigator

Kojima Wataru  山口大学, 大学院創成科学研究科, 助教 (70750462)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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)
Keywords生活史 / 季節適応 / 地域変異 / 甲虫 / 幼虫 / 成長速度 / 昆虫 / 外来生物 / 進化
Outline of Final Research Achievements

I examined geographic variation of larvae growth pattern of the Japanese rhinoceros beetle Trypoxylus dichotomus. Larvae originated from ca. 15 populations were reared under common laboratory environment. The larval body mass was measured every 5 days, and growth parameters of each individuals were estimated. I found a strong positive relationship between growth rate and latitude. The rapid growth of beetles from high latitudes is probably adaptation for completion of development before winter. I also examined the larval growth pattern of northernmost, Hokkaido populations that were introduced ca. 50 years ago. However, I found no evidence of rapid adaptation of the growth pattern of the Hokkaido populations.

Academic Significance and Societal Importance of the Research Achievements

幼体の成長速度と緯度との関係は、これまで特に昆虫では少数の種でしか調べられてこなかった。また、その結果もさまざまであったが、その大きな原因として、成長速度の推定方法の不正確さが考えられていた。本研究では、体重の測定ポイントをできるだけ増やし、成長曲線を高い精度で推定することに成功した。その結果、緯度と幼体の成長速度の間に強い正の相関を見出した。本研究により、幼体の成長速度の地域変異がどのようにして進化してきたかを考える上で重要な知見となる。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • Research Products

    (4 results)

All 2019 2018

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

  • [Journal Article] Greater degree of body size plasticity in males than females of the rhinoceros beetle Trypoxylus dichotomus2019

    • Author(s)
      Kojima, W
    • Journal Title

      Applied Entomology and Zoology

      Volume: 印刷中 Issue: 3 Pages: 239-246

    • DOI

      10.1007/s13355-019-00618-0

    • NAID

      40021964452

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pre-ovipositional maternal care alleviates food stress of offspring in the flower beetle Dicronocephalus wallichii2018

    • Author(s)
      Kojima, W. & Lin, CP.
    • Journal Title

      Journal of Ethology

      Volume: 印刷中 Issue: 2 Pages: 135-141

    • DOI

      10.1007/s10164-018-0544-1

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 島のカブトムシはなぜ小さいか:遺伝的同化による島嶼化の検証2019

    • Author(s)
      小島渉、星崎杉彦、林仲平
    • Organizer
      日本応用動物昆虫学会
    • Related Report
      2018 Annual Research Report
  • [Book] カブトムシの音がきこえる 土の中の11か月 (月刊たくさんのふしぎ2018年3月号)2018

    • Author(s)
      小島渉
    • Total Pages
      40
    • Publisher
      福音館書店
    • Related Report
      2017 Annual Research Report

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Published: 2017-08-25   Modified: 2020-03-30  

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