Testosterone predicts future dominance rank and mating activity among male chacma baboons

Behavioral Ecology and Sociobiology - Tập 59 - Trang 469-479 - 2005
J. C. Beehner1,2, T. J. Bergman1, D. L. Cheney1, R. M. Seyfarth3, P. L. Whitten4
1Biology Department, University of Pennsylvania, Philadelphia, USA
2Department of Ecology and Evolutionary Biology, Princeton University, Princeton, USA
3Psychology Department, University of Pennsylvania, Philadelphia, USA
4Department of Anthropology, Emory University, Atlanta, USA

Tóm tắt

Despite the many benefits that testosterone has on male reproduction, sustaining high levels of testosterone for long periods can be costly. The challenge hypothesis predicts that males will show temporarily sustained elevations of testosterone at critical periods, counterbalanced by decreased levels during noncritical periods. We investigated male testosterone measures extracted from fecal samples in a group of chacma baboons (Papio hamadryas ursinus) living in the Okavango Delta, Botswana. Because rank serves as a proxy for competition for mates, we examined how male testosterone was related to dominance rank, age, aggression, and mating activity. Males showed an elevation in testosterone at maturity; young adult males had the highest testosterone levels followed by a steady decline with age. Among dispersing males, testosterone was temporarily elevated in the month following dispersal. After controlling for age, testosterone and rank were unrelated, but testosterone and changes in rank were positively correlated, such that males rising in rank had higher testosterone than males falling in rank. Thus, for males in this group, testosterone was predictive of a male's rank trajectory, or future rank. Similarly, male testosterone levels predicted future, rather than current, mating activity. Finally, male testosterone and aggression rates were unrelated during stable periods in the dominance hierarchy but positively related during unstable periods when high ranks were being contested. In general, our results support the challenge hypothesis with males exhibiting elevated testosterone in association with the acquisition of high rank (ensuring access to mates), rather than with mating itself.

Tài liệu tham khảo

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