Plumage yellowness predicts foraging ability in the blue tit Cyanistes caeruleus
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Plumage yellowness predicts foraging ability in the blue tit Cyanistes caeruleus
Carotenoid-based coloration in adult birds has been often regarded as an honest signal of individual quality. However, few studies have demonstrated a link between carotenoid display and the quantity or quality of resources provided to the offspring. The present study investigated the expression of a carotenoid-based ornament, the breast plumage yellowness of the blue tit Cyanistes caeruleus, i...
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In some bird species, both adult and juvenile individuals are often brightly coloured. It has been commonly assumed that identical plumage colouration present in both sexes results from strong intersexual genetic correlations in colour-related traits. Here, we aimed at testing this hypothesis in juvenile individuals and looked at genetic parameters describing carotenoid-based colouration of blu...
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Many vertebrates use colour vision for vital behaviour but their visual performance in dim light is largely unknown. The light intensity threshold of colour vision is known only for humans, horses and two parrot species. Here, we first explore this threshold in a passerine bird, the blue tit (Cyanistes caeruleus). Using classic conditioning of colour cues to food rewards in three individuals, w...
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A. Mennerat (correspondence), P. Perret and M. M. Lambrechts, Centre d’Ecologie Fonctionnelle et Evolutive, 1919 Route de Mende, Cedex 5, 34293 Montpellier, France. E-mail: [email protected]. S. P. Caro, Centre d’Ecologie Fonctionnelle et Evolutive and the Netherlands Institute of Ecology, P.O. Box 40, 6666 ZG Heteren, The Netherlands. P. Heeb, Laboratoire Evolution & Diversité Biolog...
متن کاملDo glucocorticoids predict fitness? Linking environmental conditions, corticosterone and reproductive success in the blue tit, Cyanistes caeruleus
Glucocorticoids, including corticosterone (CORT), have been suggested to provide a physiological link between ecological conditions and fitness. Specifically, CORT, which is elevated in response to harsh conditions, is predicted to be correlated with reduced fitness. Yet, empirical studies show that CORT can be non-significantly, positively and negatively linked with fitness. Divergent environm...
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ژورنال
عنوان ژورنال: Biological Journal of the Linnean Society
سال: 2012
ISSN: 0024-4066
DOI: 10.1111/j.1095-8312.2012.01865.x