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2012 Fiscal Year Final Research Report

Introgression and niche dynamics in two ecologically divergent species

Research Project

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Project/Area Number 22770021
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

MIMURA Makiko  九州大学, 大学院・理学研究院, 特任助教 (60451689)

Project Period (FY) 2010 – 2012
Keywords分布変遷 / 気候変動 / 浸透交雑
Research Abstract

The margins of a species’ range might be most vulnerable under climate changes, but it may also undergo significant evolutionary change due to drastic population dynamics, e.g. contacts with new species. We tested
(1) differences in range shift and its consequences, along with past climate change, in two closely related but ecologically distinct Rubus species (R. palmatus and R. grayanus) and
(2) asymmetric introgression between these two species at the contact zone. We studied nine populations in total from southern and northern margins of two species. Coalescent analysis based on 12 putatively functional gene sequences together with niche modeling during GLM, suggested that the southernmost populations of R. palmatus perhaps persisted since before the Last Glacial Maximum (LGM). Conversely, the R. grayanuspopulations diverged relatively recently and likely represent young outposts of a northbound range shift. Significant introgression was only detected between R. palmatus and R. grayanus on Yakushima Island, where the margins of the species’ ranges overlapped parapatrically. Structure analysis in ten populations on the contact zone on the island suggests gradual introgression along the altitudes. Further investigation is in progress to test whether any gene under selection is moving from one to another species faster than neutral expectation. We conclude that introgression between these relatives has recently taken place at these marginal populations induced by climate changes. Introgression could increase the evolutionary potential at the margins of the species’ range under extreme environments in the species’ niches.

  • Research Products

    (4 results)

All 2013 2012 2011

All Presentation (4 results)

  • [Presentation] 野生ラズベリーの分布域ダイナミクスと適応的浸透交雑の検証2013

    • Author(s)
      三村真紀子
    • Organizer
      新学術領域「複合適応形質進化の遺伝子基盤解明」領域会議 イブニングセミナー
    • Place of Presentation
      鹿児島
    • Year and Date
      2013-03-11
  • [Presentation] Testing adaptive introgression in wild raspberry2013

    • Author(s)
      Makiko Mimura
    • Organizer
      4th Joint Symposium GCOE Asian Conservation Ecology
    • Place of Presentation
      Fukuoka, Japan
    • Year and Date
      2013-02-09
  • [Presentation] Whathappens when the rear and leading edges of two species meet?2012

    • Author(s)
      Makiko Mimura, Misako Mishima, Martin Lascoux, Tetsukazu Yahara
    • Organizer
      Joint Meeting of the 59^<th>Annual Meeting of ESJ and the 5^<th>EAFES International Congress
    • Place of Presentation
      Ostu, Japan
    • Year and Date
      2012-03-20
  • [Presentation] 異所適応したキイチゴ属 2 種の多様性解析2011

    • Author(s)
      三村真紀子、三島美佐子、矢原徹一
    • Organizer
      第122回日本森林学会大会
    • Place of Presentation
      静岡
    • Year and Date
      2011-03-25

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Published: 2014-08-29  

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