Androgen in free-living arctic ground squirrels: Seasonal changes and influence of staged male-male aggressive encounters

C. Loren Buck, Brian M. Barnes

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

We tested the responsiveness of plasma androgen in free-living male arctic ground squirrels (Spermophilus parryii) to challenges from conspecific males by staging aggressive encounters between males and then comparing androgen concentrations in manipulated and unmanipulated animals. The effect of staged encounters on androgen depended on time of year. In spring, androgen levels significantly increased after staged encounters, except during the peak of mating activity when levels were maximal in all reproductive males. In late summer, staged encounters had no significant effect on androgen levels. In spring but not summer, androgen was positively correlated to the relative intensity of encounters. These results suggest that circulating levels of androgen in male arctic ground squirrels result from a combination of seasonal and social factors. Responsiveness of androgen to encounters during spring but not late summer support the challenge hypothesis for this polygynous mammal.

Original languageEnglish (US)
Pages (from-to)318-326
Number of pages9
JournalHormones and Behavior
Volume43
Issue number2
DOIs
StatePublished - Feb 2003
Externally publishedYes

Keywords

  • Aggression
  • Androgen
  • Arctic
  • Challenge hypothesis
  • Spermophilus

ASJC Scopus subject areas

  • Endocrinology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience

Fingerprint

Dive into the research topics of 'Androgen in free-living arctic ground squirrels: Seasonal changes and influence of staged male-male aggressive encounters'. Together they form a unique fingerprint.

Cite this