An experimental analysis of the heritability of variation in glucocorticoid concentrations in a wild avian population.

摘要: Glucocorticoid hormones (CORT) are predicted to promote adaptation variable environments, yet little is known about the potential for CORT secretion patterns respond selection in free-living populations. We assessed heritable variation underlying differences hormonal phenotypes using a cross-foster experimental design with nestling North American barn swallows (Hirundo rustica erythrogaster). Using bivariate animal model, we partitioned variance baseline and stress-induced concentrations into their additive genetic rearing environment components estimated correlation. Both were heritability of 0.152 0.343, respectively. found that was best explained by environment, whereas contributed combination environmental factors. Further, did not detect correlation between these two traits. Although appears play an important role both types CORT, our results suggest levels underlain greater compared levels. Accordingly, infer glucocorticoid response stress has evolutionary change patterns.