Hormonal correlates of parental behavior in yellow-eyed penguins (Megadyptes antipodes)
Penguins show varying degrees of brood reduction behavior, from obligate brood reducers to brood maximizers, and we hypothesize that this is associated with differences in prolactin secretion. To address this hypothesis, we determined the breeding season prolactin profile of the yelloweyed penguin (Megadyptes antipodes) for comparison with those of other penguin species found in the […]
Stress hormones and mate choice
A few recent studies have suggested that glucocorticoid stress hormones can play a role in sexual selection. In terms of mate choice, these studies have shown that individuals can exhibit preferences for mates with either low baseline or peak glucocorticoid levels. This appears to occur because stress hormones can be key mediators of many condition-dependent, […]
Effect of acute captivity stress on plasma concentrations of corticosterone and sex steroids in female whistling frogs, Litoria ewingi
Plasma concentrations of corticosterone and sex steroids were examined in vitellogenic frogs (Litoria ewingi) at 0, 0.5, 3, and 24 hr after capture from the wild. Plasma corticosterone concentrations were undetectable (