Effects of social status, age, and season on androgen and cortisol levels in wild male golden lion tamarins (Leontopithecus rosalia)
Effects of social status, age, and season on androgen and cortisol levels in wild male golden lion tamarins (Leontopithecus rosalia)
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DOI：
10.1016/j.yhbeh.2005.05.006
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发表时间：
2006-01-01
影响因子：
3.5
通讯作者：
Dietz, JM
中科院分区：
文献类型：
--
作者：
Bales, KL;French, JA;Dietz, JM
本研究探讨影响野生雄性金狮绢毛猴（Leontopithecus罗萨利亚）雄激素和皮质醇水平的因素。金狮绢毛猴是一种合作繁殖的物种，其中群体通常包含两个潜在的繁殖雄性。兄弟们经常一起移民并形成明确的统治等级制度，但他们之间的互动主要是从属性的。男性没有亲属关系的二人组不太稳定。此外，生殖偏斜理论预测，占主导地位的男性将不太可能与相关的下属分享生殖。因此，我们预测，雄激素和皮质醇将在从属男性无关的主导男性更高。根据温菲尔德的“挑战假说”（1990年），我们还预测交配季节雄性的雄激素水平将高于分娩/婴儿护理季节。粪便样本收集了24名男性在14个社会群体和酶免疫分析。雄激素水平较高的繁殖雄性在交配季节，从而支持的挑战假说。然而，虽然从属男性无关的占主导地位的男性有显着较低的雄激素比任何其他组，皮质醇水平，并没有相应地更高。这些结果表明，无关的下属男性表现出可测量的生殖抑制，并可能使用的策略，如anallization，以避免侵略占主导地位的男性。(c)2005年爱思唯尔公司All rights reserved.
This study examines factors affecting androgen and cortisol levels in wild, male golden lion tamarins (Leontopithecus rosalia). Golden lion tamarins are a cooperatively breeding species in which groups often contain two potentially breeding males. Brothers frequently emigrate together and develop a clear dominance hierarchy, but interactions between them are primarily affiliative. Duos in which the males are not related are less stable. In addition, reproductive skew theory predicts that dominant males will be less likely to share reproduction with related subordinates. As such, we predicted that both androgens and cortisol would be higher in subordinate males unrelated to the dominant male. We also predicted that androgens in breeding males would be higher during the mating season than the birth/infant care season, as per Wingfield's "challenge hypothesis" (1990). Fecal samples were collected from 24 males in 14 social groups and assayed by enzyme immunoassay. Androgen levels were higher in breeding males during the mating season, thus supporting the challenge hypothesis. However, while subordinate males unrelated to the dominant male had significantly lower androgens than any other group, cortisol levels, were not correspondingly higher. These results suggest that unrelated subordinate males show measurable reproductive suppression and may use strategies such as infantilization to avert aggression from dominant males. (c) 2005 Elsevier Inc. All rights reserved.