飛鳥の羽毛の色付けのための破壊的な性選択
E Greene1, B E Lyon, V R Muehter
1Division of Biological Sciences, The University of Montana, Missoula 59812, USA. egreene@selway.umt.edu
Nature
|November 9, 2000
まとめ
破壊的な性選択は,限られた巣の覆いがある地域では,中間のものではなく,鈍くて明るい雄のラズリ・ブンテングを好む. これは,成鳥と幼鳥の両方に利益をもたらす稀な雄の雄の協力につながります.
科学分野:
- 進化生物学の進化生物学について
- 行動生態学 行動生態学
- 鳥類学 鳥類学とは,鳥類学である.
背景:
- 性選択理論は,典型的には極端な表現を好む,誇張された特徴の進化を説明します.
- これまでの研究は,一般的に性器の方向性選択を前提としている.
研究 の 目的:
- 1年生オスのラズリ・バンティング (Passerina amoena) の羽毛の色付けに関する破壊的選択を調査する.
- 社会的な近所を形成し,年配の成功に影響を与える上で,成人の男性攻撃性の役割を理解する.
主な方法:
- 羽毛の色と領土の獲得に関連した1年生オスのラズリ・バンティングの観察研究.
- 生殖の成功と適性の比較を決定するための父性の分析.
- 羽毛の色合いが異なる1歳児に対する成人の雄の攻撃性の評価.
主要な成果:
- 最も鈍くて明るい羽毛を持つ1年生のオスのラズリ・バンティングは,中間よりも領土を獲得し,ペアリングに成功しました.
- 成人した雄は,鈍い1歳児に対して攻撃性が少なく,よりよい領土を確保することを可能にしました.
- 父性分析は,成人男性と鈍い1歳児の両方に遺伝的利点があることを確認しました.
結論:
- 破壊的選択は,ラズリで作られた性的装飾 (羽毛の色) に作用する.
- 性的に選択された男性-男性協力の珍しい例が特定され,成人の男性と鈍い1歳児の両方に利益をもたらしました.
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