トップでの生活:野生の雄バビオンのランクとストレス
Laurence R Gesquiere1, Niki H Learn, M Carolina M Simao
1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. lgesquie@princeton.edu
Science (New York, N.Y.)
|July 19, 2011
まとめ
支配的な雄バビオンはテストステロンが高く,ストレスホルモンのレベルが低く,アルファ雄は両方とも高いレベルを示します. これは,トップランクがこれまで考えられていたよりも高価である可能性を示唆しています.
科学分野:
- プリマトロジー・プリマトロジー学
- 行動生態学 行動生態学
- エンドクリノロジー エンドクリノロジー
背景:
- 動物集団における社会的階層は,繁殖の成功率の向上など,多くの利益をもたらします.
- 支配的な社会的地位を維持することに関連する生理学的コストは,完全に理解されていません.
- 以前の仮説では,不安定な社会的階層の中でのみストレスホルモンが上昇することを示唆していました.
研究 の 目的:
- サバンナ・バビオンのオスにおける社会的優位性の長期的な生理学的コストを調査する.
- 社会的地位,テストステロン,およびグルココルチコイドレベルとの関係を調べる.
- ランクに関連したストレスホルモンレベルに関する一般的な仮説を検証する.
主な方法:
- サバンナ・パビオン (Papio cynocephalus) の自然集団に関する長期観察研究.
- 社会階級の監視と,ホルモンレベルを測定するために生理学的サンプルを採取する.
- 社会的階層のランクと安定性との関係でテストステロンとグルココルチコイドのレベルを分析する.
主要な成果:
- ランキングの高い男性では,ランキングの低い男性よりも一貫して高いテストステロン濃度を示していました.
- 高位の男性では,階層の安定性に関係なく,一般的に低いグルココルチコイド (ストレスホルモン) レベルを示しました.
- アルファ雄は顕著な例外であり,テストステロンとグルココルチコイドの両方のレベルが上昇し,特にベータ雄よりも高いストレスホルモンを示した.
結論:
- オスのバビオンの社会的優位性は,異なるホルモンプロファイルと関連しています.
- 最高ランク (アルファ) は,ストレスホルモンの上昇によって示される重要な生理学的コストを伴う可能性があります.
- この発見は,安定した階層構造における社会的支配とストレスのコストに関する以前の仮定に異議を唱えている.
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