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リング種の複合体におけるゲノム分岐

Miguel Alcaide1, Elizabeth S C Scordato2, Trevor D Price3

  • 11] Department of Zoology and Biodiversity Research Centre, University of British Columbia, 6270 University Boulevard, Vancouver, British Columbia V6T 1Z4, Canada [2] Department of Evolutionary Ecology, Estación Biológica de Doñana - CSIC, Americo Vespucio s/n, 41092 Sevilla, Spain.

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|May 30, 2014
PubMed
まとめ
この要約は機械生成です。

緑色のワルバー (Phylloscopus trochiloides) のリング種は,孤立した集団間の偶発的な交配を示し,距離によって異種化に挑戦しています. ゲノム全体のデータは,チベット環の周りの歴史的遺伝子フローの断絶と多様な生殖的孤立を明らかにしています.

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科学分野:

  • 進化生物学の進化生物学について
  • 種付け研究 種付け研究
  • 人口遺伝学 人口遺伝学

背景:

  • リング種は,漸進的な種化についての洞察を提供しますが,ほとんど観察されません.
  • 緑色のワルバー (Phylloscopus trochiloides) 複合体はチベット周りのリングを形成し,生殖的に孤立した2つのシベリアの形態と接続グラデントがあります.

研究 の 目的:

  • ゲノム全体のデータを用いて,緑色のワルバーリング種内の歴史的遺伝子フローとハイブリダイゼーションパターンを調査する.
  • この複合体を形作る地理的孤立と交配を含む進化過程を明らかにする.
  • この鳥類モデルにおける距離による種種化仮説を検証する.

主な方法:

  • 緑色のワルバーの集団における遺伝的多様性の全ゲノム分析.
  • 遺伝的および現象的特徴の空間的パターンの評価.
  • 異なる形態の間の生殖的孤立と内侵略のレベルを評価する.

主要な成果:

  • 遺伝的変異パターンはリング種と一致しますが,歴史的な遺伝子フローの断絶は複数の点で発生しました.
  • シベリアの2つの形態は,時折交配し,限られた非対称な内侵入をしていました.
  • 地理的な孤立期は,ヒマラヤ山脈の北と西で特定され,後者は重要なハイブリッドゾーンを特徴としています.
  • 繁殖的孤立と内侵入のレベルは,表型の分岐と相関しており,北部の分岐と南西部の交配との類似を示しています.

結論:

  • 緑色のワルバー複合体は,距離モデルによる種種化に挑戦しています.
  • 種種化には,孤立の期間と,その後の交配が含まれるため,連続的な分岐に繋がります.
  • この研究は,リング種内の複雑な進化動態を強調し,選択が侵入した遺伝子に影響を与える.