2026-04-17T12:50:55Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/613632025-12-05T09:46:12Zcom_2072_1057col_2072_478778col_2072_478917

00925njm 22002777a 4500 dc Navarro Bernabé, Joan author González-Solís, Jacob author Viscor Carrasco, Ginés author 2015-01-15T16:10:29Z 2015-01-15T16:10:29Z 2007 2015-01-15T16:10:29Z In birds, parents adjust their feeding behaviour according to breeding duties, which ultimately may lead to seasonal adjustments in nutritional physiology and hematology over the breeding season. Although avian physiology has been widely investigated in captivity, few studies have integrated individual changes in feeding and physiological ecology throughout the breeding season in wild birds. To study relationships between feeding ecology and nutritional ecophysiology in Cory"s shearwater Calonectris diomedea, we weighed and took blood samples from 28 males and 19 females during the pre-laying, egg-laying, incubation, hatching and chick-rearing periods of the breeding season. In addition, we fitted 6 birds with geolocators to track their foraging movements throughout the reproductive period. Thus, we examined individual changes in (1) nutritional condition (biochemistry metabolites); (2) oxygen carrying capacity (hematology); and (3) feeding areas and foraging effort (stable isotopes and foraging movements). Geolocators revealed a latitudinal shift in main feeding areas towards more southern and more neritic waters throughout the breeding season, which is consistent with the steady increase in δ13C signatures in the blood. Geolocators also showed a decrease in foraging effort from egg-laying to hatching, reflecting the activity decrease associated with incubation duties. Plasma metabolites, body mass and oxygen carrying capacity were associated with temporal changes in nutritional state and foraging effort in relation to recovery after migration, egg formation, fasting shifts during incubation and chick provisioning. This study shows that combining physiological and ecological approaches can help us understand the influence of breeding duties on feeding ecology and nutritional physiology in wild birds. Biologia marina Ocells marins Nutrició animal Ecofisiologia animal Marine biology Sea birds Animal nutrition Animal ecophysiology Nutritional and feeding ecology in the Cory"s shearwater (Calonectris diomedea).