Does hierarchy stability influence testosterone and cortisol levels of bearded capuchin monkeys (Sapajus libidinosus) adult males? A comparison between two wild groups

Autor(es)

Mendonca-Furtado, Olivia ; Edaes, Mariana ; Palme, Rupert ; Rodrigues, Agatha ; Siqueira, Jose ; Izar, Patricia

• Tipo de documento: Artigo Científico
• Fonte: Behavioural Processes; v. 109, p. 10-pg., 2014-11-01.

Resumo

Testosterone and cortisol are hormones expected to play a major role in competitive behaviours (i.e. aggression), and are related to rank and hierarchical stability. Through a non-invasive technique, we analyzed faecal testosterone (FTM1) and cortisol (FCM2) metabolites of dominant and subordinate males from two wild groups of bearded capuchin monkeys. One group had a stable dominance hierarchy while the other had an unstable hierarchy, with a marked conflict period related to a male take-over. In the unstable hierarchy group (1) the dominant male had higher FTM peaks than subordinates, and (2) basal FTM levels were higher than in the stable group. These findings are in accordance with the Challenge Hypothesis and rank-based predictions, and confirm that in Sapajus libidinosus hierarchy stability, social status, aggression rates and testosterone are closely related. Dominants of both groups had higher basal and peak FCM levels, suggesting that in S. libidinosus the dominant male has a higher allostatic load than subordinates, related to his role in protection against predators, intragroup appeasement, and control of food sources. Finally, we suggest that males of S. libidinosus are resistant to testosterone suppression by cortisol, because in the unstable group in spite of an increase in FCM there was also an increase in FTM during the conflict period. This article is part of a Special Issue entitled: Neotropical Behaviour. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/55684-3 - Variabilidade de comportamento social de macacos-prego (gênero Cebus): análise comparativa entre populações para investigação de correlatos fisiológicos
• Beneficiário: Patrícia Izar Mauro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/52293-3 - Medidas de metabolitos de cortisol em macacos-prego (genero cebus): analise comparativa entre populacoes para investigacao de fatores estressores.
• Beneficiário: Olívia de Mendonça Furtado Pimenta
• Modalidade de apoio: Bolsas no Brasil - Doutorado