Fig. 3

High male feeding rate prior to cort treatment combined with cold temperatures increases the risk of brood failure. Predicted values (relative risk of nest failure, i.e., daily mortality relative to the mean) from the best-supported Cox proportional hazard model (see Table 2c) with respect to pre-treatment male feeding rate and female cort manipulation. Solid and dashed lines represent cort and control groups, respectively, and the grey bands represent the standard error of the predicted values. For visualization purposes in this figure only, maximum daily temperatures <20 °C were considered a cold period and maximum daily temperatures ≥ 20 °C were considered normal; note that temperature was treated as a continuous variable in all statistical analyses (e.g., Table 2c)