Repeatable glucocorticoid expression is associated with behavioural syndromes in males but not females in a wild primate

Tkaczynski, PJ, Ross, C, Lehmann, J , Mouna, M, Majolo, Bonaventura and MacLarnon, A (2019) Repeatable glucocorticoid expression is associated with behavioural syndromes in males but not females in a wild primate. Royal Society Open Science, 6 (9). ISSN 2054-5703

Full content URL: http://dx.doi.org/10.1098/rsos.190256

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Repeatable glucocorticoid expression is associated with behavioural syndromes in males but not females in a wild primate
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Abstract

Behavioural syndromes are a well-established phenomenon in human and non-human animal behavioural ecology. However, the mechanisms that lead to correlations among behaviours and individual consistency in their expression at the apparent expense of behavioural plasticity remain unclear. The ‘state-dependent’ hypothesis posits that inter-individual variation in behaviour arises from inter-individual variation in state and that the relative stability of these states within an individual leads to consistency of behaviour. The endocrine stress response, in part mediated by glucocorticoids (GCs), is a proposed behavioural syndrome-associated state as GC levels are linked to an individual’s behavioural responses to stressors. In this study, in wild Barbary macaques (Macaca sylvanus), consistent inter-individual differences were observed in both sexes for GC activity (faecal glucocorticoid, fGC concentrations), but not GC variation (coefficient of variation in fGC concentrations). The expression of the behavioural syndrome ‘Excitability’ (characterized by the frequencies of brief affiliation or aggressive interactions) was related to GC activity in males but not in females; more ‘excitable’ males had lower GC activity. There was no relationship in females between any of the behavioural syndromes and GC activity, nor in either sex with GC variation. The negative relationship between GC activity and Excitability in males provides
some support for GC expression as a behavioural syndromegenerating state under the state-dependent framework.

Keywords:Barbary Macaques, Hormones
Subjects:C Biological Sciences > C800 Psychology
Divisions:College of Social Science > School of Psychology
ID Code:37242
Deposited On:25 Sep 2019 10:13

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