自然選択と配偶者認識の強化

M Higgie¹, S Chenoweth, M W Blows

¹Department of Zoology and Entomology, University of Queensland, St. Lucia 4072, Australia. MHiggie@zoology.uq.edu.au

Science (New York, N.Y.)

|October 20, 2000

まとめ

自然淘汰は,生殖特性移転を通して,種種を駆動する. 実験では,アロパトリックのドロソフィラ・セラータの個体群が,シンパトリックの個体群に匹敵するように進化したことを示した.

科学分野:

進化生物学の進化生物学について
仕様研究研究仕様
行動生態学行動生態学

背景:

配偶者の認識は,種種の形成の重要な要因である.
生殖特性の移転は,重複する範囲を持つ種が異なる配偶者認識特性を進化させるときに起こります.
ドロソフィラ・セラータの個体群は,ドロソフィラ・ビーチイと共感すると,皮状炭化水素の生殖特性シフトを示します.

研究の目的:

繁殖性性格の移転を誘発する配偶者認識における自然選択の役割を調査する.
Drosophila serrataにおける状炭化水素の進化的反応をシンパトリの下で実験的にテストする.

主な方法:

ドロソフィラ・セラータのフィールドで収集されたアロパトリックとシンパトリックの集団を,ドロソフィラ・ビーチイとの実験的シンパトリに9世代に渡って暴露した.
パート認識特性の測定として,皮質の炭化水素プロフィールの変化を分析した.

主要な成果:

フィールドアロパトリックのドロソフィラ・セラータの集団の状炭化水素は,フィールドシンパトリックの集団に似ているように進化した.
フィールドシンパトリックのDrosophila serrata集団は,皮質の炭化水素の有意な変化を示さなかった.
実験的な共感は,配偶者認識の特徴における進化的変化を誘発した.

結論:

配偶者の認識に関する自然淘汰は,生殖特性移転の重要な原動力である.
この研究は,観察された生殖特性移転のフィールドパターンの形成における自然選択の役割を実験的に検証している.
キュティキュラー炭化水素は,種化過程における自然選択の影響を受ける重要な特徴である.

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