性的腫れは,野生のバビオンの女性の質を宣伝する
1Department of Anthropology, Harvard University, Cambridge, Massachusetts 02138, USA. lgdomb@aol.com
Nature
|March 10, 2001
まとめ
バビオンの場合,メスの場合のより大きな性腫れは,より高い生殖価値と生涯の生殖成功の兆候です. オスは膨張の大きさを利用して,繁殖能力の高い雌に交尾を促す.
科学分野:
- 類人猿の生殖行動について
- 性選択性選択性選択とは
- 動物のシグナル伝達
背景:
- オールド・ワールドの霊長類は,排卵のまわりに顕著な経性腫れを示します.
- これらの腫れは,生殖状態や排卵のタイミングをシグナルし,雄の競争と受精に影響を及ぼすと仮定されています.
- 女性の生殖シグナル伝達における性腫れの機能は,依然として活発な研究分野である.
研究 の 目的:
- 野生のバビオンの性的な腫れが,雌の生涯の生殖価値の誠実な信号として機能するかどうかを調査する.
- オスのバビオンは,交尾の努力を調整するために膨胀サイズを使用するかどうかを判断するために.
- 性選択における誠実なシグナリングの理論的モデルから派生した予測をテストする.
主な方法:
- 野生のバビオンの集団の観察研究.
- 女性における性腫の大きさの定量化.
- 腫れの大きさと女性の生殖能力のパラメータ (成熟年齢,子孫の産生,子孫の生存率) の相関分析.
- 男性の交尾行動 (攻撃性,コンソート時間) を,雌の腫れサイズに関連して分析する.
主要な成果:
- 性的な腫れは,女性の生涯の生殖価値を確実に宣伝します.
- 腫れが大きいメスは,より早く性成熟に達し,毎年生存できる子孫を多く生み出した.
- 雄バビオンは,より大きな腫れを持つ雌に対して,攻撃性やケージングの増大を含む,より大きな交尾努力を,より大きな腫れを持つ雌に向けました.
結論:
- メスバビオンの性腫は,生殖価値の誠実な信号として機能する.
- 腫れの大きさに基づく男性の配偶者選択は,生存する子孫を生む可能性のある女性との交配の確率を高めます.
- この研究は,男性の選択性交配によって引き起こされる女性の性的に選択された装飾物の珍しいケースを提示しています.
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