Increasing energy expenditure for a deep-diving bird alters time allocation during the dive cycle
How foraging animals respond to changes in energy costs is poorly understood. Energy costs are especially important for central-place foragers because they determine transit costs as well as foraging costs. For example, oxygen consumption during diving determines the minimum surface pause for a given oxygen store, dive depth and dive duration. A theoretical model based […]
Glucocorticoids, individual quality and reproductive investment in a passerine bird
Measures of individual quality, especially energetic resources, have long been linked to investment in reproduction. However, the physiological mechanisms underlying this relationship are not well understood. In this study, we examined glucocorticoids as a potential mediator linking individual quality to investment in reproduction, because glucocorticoids have been associated with measures of both energetic resources and […]