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Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats.

Publication ,  Journal Article
delBarco-Trillo, J; Greene, LK; Goncalves, IB; Fenkes, M; Wisse, JH; Drewe, JA; Manser, MB; Clutton-Brock, T; Drea, CM
Published in: Hormones and behavior
February 2016

In male vertebrates, androgens are inextricably linked to reproduction, social dominance, and aggression, often at the cost of paternal investment or prosociality. Testosterone is invoked to explain rank-related reproductive differences, but its role within a status class, particularly among subordinates, is underappreciated. Recent evidence, especially for monogamous and cooperatively breeding species, suggests broader androgenic mediation of adult social interaction. We explored the actions of androgens in subordinate, male members of a cooperatively breeding species, the meerkat (Suricata suricatta). Although male meerkats show no rank-related testosterone differences, subordinate helpers rarely reproduce. We blocked androgen receptors, in the field, by treating subordinate males with the antiandrogen, flutamide. We monitored androgen concentrations (via baseline serum and time-sequential fecal sampling) and recorded behavior within their groups (via focal observation). Relative to controls, flutamide-treated animals initiated less and received more high-intensity aggression (biting, threatening, feeding competition), engaged in more prosocial behavior (social sniffing, grooming, huddling), and less frequently initiated play or assumed a 'dominant' role during play, revealing significant androgenic effects across a broad range of social behavior. By contrast, guarding or vigilance and measures of olfactory and vocal communication in subordinate males appeared unaffected by flutamide treatment. Thus, androgens in male meerkat helpers are aligned with the traditional trade-off between promoting reproductive and aggressive behavior at a cost to affiliation. Our findings, based on rare endocrine manipulation in wild mammals, show a more pervasive role for androgens in adult social behavior than is often recognized, with possible relevance for understanding tradeoffs in cooperative systems.

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Published In

Hormones and behavior

DOI

EISSN

1095-6867

ISSN

0018-506X

Publication Date

February 2016

Volume

78

Start / End Page

95 / 106

Related Subject Headings

  • Testosterone
  • Social Behavior
  • Male
  • Herpestidae
  • Flutamide
  • Female
  • Dominance-Subordination
  • Behavioral Science & Comparative Psychology
  • Behavior, Animal
  • Animals
 

Citation

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delBarco-Trillo, J., Greene, L. K., Goncalves, I. B., Fenkes, M., Wisse, J. H., Drewe, J. A., … Drea, C. M. (2016). Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats. Hormones and Behavior, 78, 95–106. https://doi.org/10.1016/j.yhbeh.2015.11.001
Trillo, Javier delBarco-, Lydia K. Greene, Ines Braga Goncalves, Miriam Fenkes, Jillian H. Wisse, Julian A. Drewe, Marta B. Manser, Tim Clutton-Brock, and Christine M. Drea. “Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats.Hormones and Behavior 78 (February 2016): 95–106. https://doi.org/10.1016/j.yhbeh.2015.11.001.
delBarco-Trillo J, Greene LK, Goncalves IB, Fenkes M, Wisse JH, Drewe JA, et al. Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats. Hormones and behavior. 2016 Feb;78:95–106.
delBarco-Trillo, Javier, et al. “Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats.Hormones and Behavior, vol. 78, Feb. 2016, pp. 95–106. Epmc, doi:10.1016/j.yhbeh.2015.11.001.
delBarco-Trillo J, Greene LK, Goncalves IB, Fenkes M, Wisse JH, Drewe JA, Manser MB, Clutton-Brock T, Drea CM. Beyond aggression: Androgen-receptor blockade modulates social interaction in wild meerkats. Hormones and behavior. 2016 Feb;78:95–106.
Journal cover image

Published In

Hormones and behavior

DOI

EISSN

1095-6867

ISSN

0018-506X

Publication Date

February 2016

Volume

78

Start / End Page

95 / 106

Related Subject Headings

  • Testosterone
  • Social Behavior
  • Male
  • Herpestidae
  • Flutamide
  • Female
  • Dominance-Subordination
  • Behavioral Science & Comparative Psychology
  • Behavior, Animal
  • Animals