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配偶者優遇における適応性可塑性は,生殖努力の差異と関連している.
A Qvarnström1, T Pärt, B C Sheldon
1Department of Animal Ecology, Evolutionary Biology Centre, Uppsala University, Sweden. annaq@biomail.ucsd.edu
Nature
|June 1, 2000
まとめ
雌のカラーフライキャッチャーは,交尾相手の好みに適応性のある可塑性を示しています. 男性の額のパッチサイズに対する好みは季節によって変化し,生殖の成功と投資に影響を与えます.
科学分野:
- 行動生態学 行動生態学
- 進化生物学の進化生物学について
- 動物の行動 動物の行動
背景:
- 配偶者の好みは,自然集団でよく記録されています.
- 配偶者好みの集団内での変動は,しばしば見過ごされ,適応性がないと考えられています.
研究 の 目的:
- 集団内の配偶者好みの変動の適応的意義を調査する.
- 環境要因がカラー付きハエ捕り鳥 (Ficedula albicollis) の交尾相手の選択に影響するかどうかを判断する.
主な方法:
- 男性の額のパッチサイズに基づいて女性の配偶者選択の実験的操作.
- 交尾相手の好みと繁殖のタイミングと生殖の成功との相関分析.
- 繁殖のタイミングと男性現象型との関係で,女性の生殖力 (クラッチサイズ) の評価.
主要な成果:
- 雌のカラーフライキャッチャーは,雄の額のパッチサイズを好むが,繁殖季節によって変化した.
- 後期繁殖の雌のみが,より大きな額のパッチを持つ雄を好む.
- 男性のパッチサイズと女性の生殖成功の間の前向きな関係は,後期繁殖において観察されました.
- 女性の生殖努力は,繁殖のタイミングと男性の特徴に基づいて調整されました.
結論:
- 配偶者の好みは,集団内で適応的な可塑性を示すことができる.
- この可塑性は,生殖の成功と投資の季節的変化と関連しています.
- 繁殖時間などの環境要因は,適応性のある配偶者の選択を形作る可能性があります.
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