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Genetic basis and evolutionary origin of migratory polymorphisms in salmonids

Research Project

Project/Area Number 26840136
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Ecology/Environment
Research InstitutionHokkaido University

Principal Investigator

Koizumi Itsuro  北海道大学, 地球環境科学研究科(研究院), 准教授 (50572799)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords生活史多型 / 表現型可塑性 / 進化 / 遺伝的基盤 / サケ科魚類 / 回遊型 / 残留型 / 降海型 / 平行進化
Outline of Final Research Achievements

This study examined the genetic basis and evolutionary origin of migratory dimorphisms in salmonids (i.e., sea-run anadromous vs. stream resident), which is among the most remarkable example of phenotypic polymorphism. More than 80 million DNA sequences were determined in 384 individuals of masu salmon and white-spotted charr. Genome-wide association analysis revealed 1-4 candidate genes related to migratory dimorphisms, but the effects of these loci were small. Compared to a draft genome of rainbow trout, candidate loci were different among the 3 species of partially migratory salmonids. This study indicates that salmonids have accomplished similar life history polymorphisms with different genetic mechanisms.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (4 results)

All 2016 2015 Other

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

  • [Int'l Joint Research] UC Davis(米国)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Absolute vs. relative assessments of individual status in status-dependent strategies under stochastic environments.2016

    • Author(s)
      Tachiki Y. and Koizumi I.
    • Journal Title

      The American Naturalist

      Volume: 187

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Rapid life history change after habitat fragmentation caused genetic homogeneity in freshwater salmonid2015

    • Author(s)
      Itsuro Koizumi
    • Organizer
      日本生態学会第62回大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2015-03-18 – 2015-03-22
    • Related Report
      2014 Research-status Report
  • [Remarks] 小泉研究室HP

    • URL

      http://noah.ees.hokudai.ac.jp/envmi/koizumilab/

    • Related Report
      2015 Annual Research Report

URL: 

Published: 2014-04-04   Modified: 2022-01-27  

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