Life at the top: rank and stress in wild male baboons.

Life at the top: rank and stress in wild male baboons.
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DOI:
10.1126/science.1207120
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发表时间:
2011-07-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Altmann J
Altmann J
中科院分区:
其他
文献类型:
--
作者:
Gesquiere LR;Learn NH;Simao MC;Onyango PO;Alberts SC;Altmann J

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在社会等级制度中,占支配地位的个体在生殖和健康方面受益,但社会支配地位的代价仍然是一个有争议的话题。普遍的假设预测,当等级不稳定时,地位较高的男性比地位较低的男性经历更高的睾丸激素和糖皮质激素(应激激素)水平,但不是其他情况。在对草原狒狒(Papio cynocephalus)自然种群中等级相关压力的长期研究中,无论等级稳定性如何,等级高的雄性比其他雄性具有更高的睾丸激素和更低的糖皮质激素水平。唯一的例外是地位最高的(阿尔法)雄性,它们表现出高睾丸激素和高糖皮质激素水平。特别是,男性领袖比排名第二的男性表现出更高的压力激素水平,这表明位居榜首的代价可能比之前想象的要高。
In social hierarchies, dominant individuals experience reproductive and health benefits, but the costs of social dominance remain a topic of debate. Prevailing hypotheses predict that higher-ranking males experience higher testosterone and glucocorticoid (stress hormone) levels than lower-ranking males when hierarchies are unstable but not otherwise. In this long-term study of rank-related stress in a natural population of savannah baboons (Papio cynocephalus), high-ranking males had higher testosterone and lower glucocorticoid levels than other males, regardless of hierarchy stability. The singular exception was the highest-ranking (alpha) males, who exhibited both high testosterone and high glucocorticoid levels. In particular, alpha males exhibited much higher stress hormone levels than second-ranking (beta) males, suggesting that being at the very top may be more costly than previously thought.
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