寄生虫は,局所的に共通の宿主遺伝子型に適応する.
1Department of Biology, Indiana University, Bloomington 47405-3700, USA. clively@indiana.edu
Nature
|June 23, 2000
まとめ
寄生虫は,共通の宿主遺伝子型に不均衡に感染することで,局所的に適応し,赤の女王仮説を支持する. この進化的軍拡競争は,寄生虫集団における寄生虫の適応と性繁殖を推進する.
科学分野:
- 進化生物学の進化生物学について
- エコロジー エコロジー エコロジー
- 寄生虫学とは,寄生虫学である.
背景:
- レッドクイーン仮説は,宿主-寄生虫の相互作用が恒常的な共進化的適応と反適応を誘発すると仮定しています.
- 寄生虫の共通の宿主遺伝子型に対する成功は,寄生虫の性繁殖と局所的な適応と相関することがあります.
研究 の 目的:
- 寄生虫の局所的な適応が,共通の宿主遺伝子型の不均衡な感染によって引き起こされるかどうかを調査する.
- 宿主遺伝子型の共通性,または他の要因が,この感染パターンを説明するかどうかを判断する.
主な方法:
- 相互のクロス・イノキュレーション実験が行われました.
- シンパトリックおよびアロパトリックの領域からの寄生虫が使用されました.
- 寄生虫感染率を,一般的な宿主遺伝子型と珍しい宿主遺伝子型で分析した.
主要な成果:
- シンパトリック寄生虫は,珍しい寄生虫よりも頻繁に共通の宿主遺伝子型に感染します.
- アロパトリック寄生虫は,一般的な宿主遺伝子型と珍しい宿主遺伝子型の感染率の有意な違いを示さなかった.
- 混合源 (F1ハイブリッド) の寄生虫も,一般的なまたは希少な宿主遺伝子型を好まないことを示しました.
結論:
- 寄生虫の局所的適応は,局所的に共通の宿主遺伝子型を追跡することによって生じる.
- この発見は,共進化的動態に関するレッドクイーン仮説の重要な条件を裏付けている.
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