REPRODUCTION AT ALL COSTS: THE ADAPTIVE STRESS RESPONSE OF MALE ARCTIC GROUND SQUIRRELS

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EFFECTS OF ENDOGENOUS STEROID HORMONE LEVELS ON ANNUAL SURVIVAL IN CLIFF SWALLOWS (2005, background): “Too much corticosterone may cause deleterious physiological effects that impact survival; the most likely is suppression of the immune system (Grossman 1990, Fowles et al. 1993, Dunlap and Schall 1995, Boonstra et al. 2001, Saino et al. 2003).”
Seasonal changes in glucocorticoid and testosterone concentrations in free-living arctic ground squirrels from the boreal forest of the Yukon (2001, background): “Boonstra et al. (2001) report a loss of over 40% of males immediately following the mating period.”
Why are Arctic ground squirrels more stressed in the boreal forest than in alpine meadows? (2001, background): “The intense chronic stress of mating activity in male Arctic ground squirrels in spring is also associated with a 6% decline in hematocrit relative to adult nonbreeding males (Boonstra et al., 2001).”
EQUIPPED FOR LIFE: THE ADAPTIVE ROLE OF THE STRESS AXIS IN MALE MAMMALS (2005, unknown): “In the boreal forest, 48% of the male ground squirrels disappear during the mating season (Boonstra et al. 2001), whereas in an adjacent alpine area, 28% die (Gillis 2003).”