Data from: An experimental analysis of the heritability of variation in glucocorticoid concentrations in a wild avian population

Brittany R. Jenkins, Maren N. Vitousek, Joanna K. Hubbard & Rebecca J. Safran
Glucocorticoid hormones (CORT) are predicted to promote adaptation to variable environments, yet little is known about the potential for CORT secretion patterns to respond to selection in free-living populations. We assessed the heritable variation underlying differences in hormonal phenotypes using a cross-foster experimental design with nestling North American barn swallows (Hirundo rustica erythrogaster). Using a bivariate animal model, we partitioned variance in baseline and stress-induced CORT concentrations into their additive genetic and rearing environment components...
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