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In free‐living animals, it has been well demonstrated that the intensity of the adrenocortical response to acute restraint stress can vary with reproductive investment during breeding. The parental care hypothesis posits that the stress response is negatively correlated with parental investment in avian species. To further test this hypothesis, we examined changes in both free and total corticosterone...
In birds, suppressed expression of stress‐induced corticosterone (CORT) during pre‐basic molt is generally thought to reflect a physiological trade‐off in self‐maintenance. And reduced CORT during breeding in extreme environments may maximize reproductive success and optimize their fitness. Highland Eurasian tree sparrows (Passer montanus) are known to express significantly higher stress‐induced CORT...
Previous studies indicate most free‐living avian species in both extreme and temperate environments seasonally modulate the adrenocortical responses to acute stress, and those breeding in harsh environments always express reduced adrenocortical responses, which may allow them to obtain maximal reproductive success. However, recent investigations showing a human commensal species, house sparrows (Passer domesticus...
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