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In birds, the timing of breeding is a key life-history trait with crucial fitness consequences. We predicted that parents may value a brood less if it hatched later than expected, thereby decreasing their parental effort. In addition, breeding effort would be further modulated by the age-specific decline of future breeding opportunities. We experimentally investigated whether snow petrels, Pagodroma...
Vertebrates secrete elevated levels of glucocorticoids in response to various stressors, which mobilize energetic reserves but concurrently interfere with reproduction. In accordance with life-history theory, recent evidence suggests that the corticosterone response to stress is modulated according to the value of the brood. Since brood value is positively related to parental care, the stress response...
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