セックスの生態学的コスト
C P Doncaster1, G E Pound, S J Cox
1Division of Biodiversity and Ecology, School of Biological Sciences, University of Southampton, UK. cpd@soton.ac.uk
Nature
|April 5, 2000
まとめ
性繁殖は,その二重のコストにもかかわらず,持続します. 遺伝的利益だけでなく,生態学的ダイナミクスは,性がどのように種内競争を通じて無性繁殖を凌駕するかを説明します.
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
- 人口の動態
背景:
- 性繁殖は"男性の2倍のコスト"に直面し,無性繁殖は成長の利点を提供します.
- 性別の流行に関する以前の説明は,しばしば複雑で長期的な進化のシナリオに依存しています.
研究 の 目的:
- 性的繁殖の持続に対する代替説明として,無性侵の生態学的ダイナミクスを調査する.
- 生態学的要因だけでは,性的な集団が無性的な競争相手に対してどのように存続できるかを説明できるかどうかを判断する.
主な方法:
- 性的および無性的集団の生態学的ダイナミクスのモデリング.
- 人口増加率と運搬能力に対する種内競争の影響を分析する.
- 性的な集団が無性的な侵略に抵抗できる条件を特定する.
主要な成果:
- 性集団の成長率の値が特定され,それを超えると無性侵は種内競争によって停止される.
- 非性的な集団は,性的な集団の負荷能力に対する抑制効果が,自分たち自身の負荷能力に比べて弱い.
- 性集団と無性集団の共存は,資源が枯渇した状態で安定した結果である.
結論:
- 生態学的要因,特に種内競争は,複合的な遺伝的利益を主張することなく,性繁殖の持続を説明することができます.
- 特定の生態学的条件下では,性的な集団は無性的な侵略に抵抗することができ,共存につながります.
- セックスの長期的利益は,無性競争者の置き換えにつながるかもしれない.
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