Maren N. Vitousek

TL;DR: A conceptual framework of rapid endocrine flexibility is proposed that integrates ecological endocrinology with theoretical and empirical studies of phenotypic plasticity and behavioral syndromes, highlighting the need for research addressing variation in the scope and speed of flexibility.

TL;DR: The data show that cort can induce immunosuppression, but they do not support the immunocompetence handicap hypothesis in its narrow sense because T concentrations were not related to immunos Puppywise, and experimental elevation of cort significantly decreased immune activity in both restrained and cort-injected animals.

TL;DR: The heritable variation underlying differences in hormonal phenotypes using a cross-foster experimental design with nestling North American barn swallows is assessed and it is inferred that the glucocorticoid response to stress has a greater potential for evolutionary change in response to selection compared with baseline glucoc Corticoid secretion patterns.

TL;DR: In a population of barn swallows experiencing high rates of nest predation, circulating levels of corticosterone (the primary avian glucocorticoid) during exposure to a standardized stressor predict aspects of subsequent behavior and fitness.

TL;DR: Despite significant overall repeatability, there was substantial heterogeneity in estimates from different studies, suggesting that repeatability of glucocorticoid secretion varies substantially across systems and conditions.