Fig. 1.

Partition of total phenotypic variance in baseline and stress-induced corticosterone levels into additive genetic (V_A), common rearing environmental (V_E), year (V_Y) and residual variance (V_R), as estimated from a model without or with covariates. The additive genetic variance for corticosterone (CORT) was estimated from data on nestlings sampled between 6 and 67 days old using animal models without (black bars) or with covariates (white bars) influencing CORT levels (e.g., date and hour of sampling, sex and mass of nestlings, see Table S2). The error bars represent the 95% Bayesian credible intervals