Setchell, J. M. and Smith, T. E. and Wickings, E. J. and Knapp, L. A. (2008) 'Social correlates of testosterone and ornamentation in male mandrills.', Hormones and behavior., 54 (3). pp. 365-372.
We investigated relationships between fecal androgen concentrations, facial coloration and behaviour in semi-free-ranging male mandrills. We found that fecal androgen levels were significantly positively related to dominance rank, independent of rank stability and the mating period, suggesting that male mandrills live in a permanently aggressive context in which they must actively maintain their dominance status. Facial red coloration was also significantly related to both fecal androgen levels and rank, with high ranking males having both higher androgen levels and redder faces, although dominant males did not always have the highest androgen levels or the reddest faces. Predictive relationships between androgen levels, coloration and rank were short-term. Androgen concentrations and facial redness both increased in the presence of receptive females, as did the former during periods of rank instability. We conclude that male facial redness is likely to represent an honest signal (to other males) of current androgen status, competitive ability and willingness to engage in fight and that females may also use this to assess male condition. Further, our findings provide support for the "challenge hypothesis" as originally proposed for birds by Wingfield.
|Keywords:||Dynamic trait, Signals, Challenge hypothesis, Mandrillus sphinx, Coloration, Condition dependent traits.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||http://dx.doi.org/10.1016/j.yhbeh.2008.05.004|
|Record Created:||06 Feb 2009|
|Last Modified:||09 Nov 2010 15:56|
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