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胎盤の進化は,生殖する魚の性選択のシフトを促します
B J A Pollux1, R W Meredith2, M S Springer3
11] Department of Biology, University of California, Riverside, California 92521, USA [2] Experimental Zoology Group, Wageningen University, 6708 WD Wageningen, the Netherlands.
Nature
|July 22, 2014
まとめ
胎盤の進化は,母子の投資をシフトさせ,雌の配偶者選択を減らし,子宮後の選択に有利にしました. このシフトは,胎盤種における男性特性の変化と交尾行動の変化と関連しています.
科学分野:
- 進化生物学の進化生物学について
- 生殖生物学 生殖生物学
- 性選択性選択性選択について
背景:
- 胎盤の進化は,母子の投資を受精後のものにシフトさせ,親子対立を引き起こします.
- 理論は,この対立が,コピュレーション前の配偶者選択よりも,ポストジゴティック性選択を好むと予測しています.
- この仮説は,経験的検証が欠けています.
研究 の 目的:
- 胎盤の進化が,交尾前のメスの配偶者選択の減少と相関するかどうかを実証的にテストする.
- 男性における関連する現象的および行動的変化を調査する.
主な方法:
- 繰り返し進化し,胎盤の喪失を示す生産魚ファミリーポエシリデーを用いた比較分析.
- 男性の特徴 (色,表情,体サイズ,生殖器) と生殖戦略 (スーパーフェテーション) を,胎盤と関連して調べた.
主要な成果:
- 置場は,男性の装飾,求愛,および表情の特徴の減少と関連しています.
- 胎盤種の雄は,より長い生殖器を持つより小さいもので,強制性交配を容易にする.
- ポストジゴティック期における母体供給は,スーパーフェテーションと潜在的なポリアンドリーと相関しています.
結論:
- 胎盤の進化は,女性のコピュレーション前の配偶者選択への依存を減らす男性の特徴と行動のセットと関連しています.
- 胎盤形成に起因する産前紛争は,性選択メカニズムに変化をもたらします.
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