title: Sex, stress and social status: patterns in fecal testosterone and glucocorticoid metabolites in male Ethiopian wolves.
abstract: Ethiopian wolves, Canis simensis, live in large multi-male family packs, where males are philopatric and do not disperse. Within a pack, mating and breeding is largely monopolized by the dominant male and female, although extra-pack copulations are common, and subordinate males may sire pups in neighboring packs. Regardless of paternity, all males in a pack help rear the pups. We non-invasively studied patterns in fecal testosterone and glucocorticoid metabolite concentrations using radioimmunoassays of fecal samples collected from nine wild male Ethiopian wolves between August 2007 and February 2008. We tested the predictions of the Challenge Hypothesis, namely that fecal testosterone metabolite concentrations would be higher during the annual mating season, which is the portion of the reproductive cycle when mating and increased aggression typically occur, and lower when there were pups in the pack for which to care. Contrary to the predictions of the Challenge Hypothesis, we did not detect patterns in fecal testosterone metabolite concentrations associated with reproductive stage during our study period. Similarly, we found no patterns associated with reproductive stage in male fecal glucocorticoid metabolite concentrations. Dominant males had higher average fecal testosterone and glucocorticoid metabolite concentrations than did subordinates, which may be related to higher rates of aggression and mate guarding in dominant males of group-living canids, a pattern also reported in African wild dogs, Lycaon pictus.
authors: Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, Recanati-Kaplan Centre, Tubney House, Tubney OX13 5QL, United Kingdom. Freyavankesteren@gmail.com
authors: Freya
authors: F
authors: van Kesteren
authors: Claudio
authors: C
authors: Sillero-Zubiri
authors: Robert
authors: R
authors: Millar
authors: Kifle
authors: K
authors: Argaw
authors: David W
authors: DW
authors: Macdonald
authors: Monique
authors: M
authors: Paris
mesh_terms: D000374:Aggression; D000818:Animals; D005002:Ethiopia; D005243:Feces; D005938:Glucocorticoids / Q000378:metabolism*; D008297:Male; D012098:Reproduction; D012726:Sexual Behavior, Animal; D012919:Social Behavior; D012930:Social Dominance; D013312:Stress, Physiological; D013739:Testosterone / Q000378:metabolism*; D019596:Wolves / Q000378:metabolism* / Q000502:physiology
chemical_list: D005938:Glucocorticoids; D013739:Testosterone