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• W2051245331 abstract "We examined variation in glucocorticoid levels in the mandrill, a brightly coloured primate species, to identify major social influences on stress hormones, and investigate relationships among glucocorticoid levels, testosterone and secondary sexual ornamentation. We collected a total of 317 fecal samples for 16 adult male mandrills over 13 months, including mating and non-mating periods and periods of both dominance rank stability and instability, and compared fecal glucocorticoid levels with dominance rank, rank stability, presence of receptive females, gastro-intestinal parasite infection, fecal testosterone and facial red coloration. Glucocorticoid levels did not vary systematically with dominance rank, but increased when the dominance hierarchy was unstable, and increased in the presence of receptive females. The relationship between dominance rank and glucocorticoid levels changed direction according to the stability of the dominance hierarchy: glucocorticoid levels were higher in subordinate males under stable conditions, but under conditions of instability higher ranking males had higher glucocorticoid levels. The influence of dominance rank also interacted with the presence of receptive females: glucocorticoids were higher in dominant males than in subordinates, but only during mating periods, suggesting that dominant males are more stressed than subordinates during such periods. These findings support previous studies showing that the relationship between glucocorticoids and dominance rank in male baboons is dependent on the social environment. We also found that males with higher glucocorticoids suffered a higher diversity of gastrointestinal parasite infection, in line with evidence that glucocorticoids suppress the immune system in other species. However, we found no support for the stress-mediated immunocompetence handicap hypothesis for the evolution of condition-dependent ornaments: glucocorticoid and testosterone levels were positively related, rather than the negative relationship predicted by the hypothesis, and we found no relationship between red colour and glucocorticoid levels, suggesting that glucocorticoids do not play a role in translating social conditions or physical health into ornament expression in this species." @default.
• W2051245331 created "2016-06-24" @default.
• W2051245331 creator A5039238157 @default.
• W2051245331 creator A5058024642 @default.
• W2051245331 creator A5079325906 @default.
• W2051245331 creator A5087563537 @default.
• W2051245331 date "2010-11-01" @default.
• W2051245331 modified "2023-09-27" @default.
• W2051245331 title "Stress, social behaviour, and secondary sexual traits in a male primate" @default.
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• W2051245331 doi "https://doi.org/10.1016/j.yhbeh.2010.07.004" @default.
• W2051245331 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20688067" @default.
• W2051245331 hasPublicationYear "2010" @default.
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