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:
影响因子:
--
通讯作者:
Altmann J
中科院分区:
文献类型:
--
作者:
Gesquiere LR;Learn NH;Simao MC;Onyango PO;Alberts SC;Altmann J
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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