Desarrollo posteclosional de la homeotermia en polluelos de dos especies de aves antárticas: Pygoscelis papua y Daption capense en península Ardley, isla Rey Jorge.
Loading...
Date
1997
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
El desarrollo de la endotennia durante el período postnatal en las aves puede variar según
el carácter altricial o precocial que presente la especie, proceso que resulta de especial importancia en ambientes fríos. En este trabajo caracterizamos el desarrollo de la endotermia en polluelos de dos especies de aves antárticas (Daption capense y Pygoscelis papua), y detenninamos la respuesta de termorregulación en crías de D.capense frente a la deprivación total de ingesta. Ambas especies alcanzan la endotermia aproximadamente a la misma edad (12 días). Los polluelos de D.capense sometidos a deprivación de alimento pierden hasta un 30% de su peso corporal sin mostrar cambios en su temperatura corporal. Discutimos los resultados en términos de compromisos energéticos y estrategias de termorregulación
The development of endothermy during the postnatal period in birds can vary according to the altricial or precocial character of the species. This process has specialimportance in cold environments. In this naper we characterized the development of endothermy in chicks of two antarctic bird species (Daption capense and Pygoscelis papua), and we determined the thermoregulatory response of chicks of D. capense in relation to total food deprivation. Both species reach endothermy approximately at the same age (12 days). The chicks of D.capense with deprivation lost about 30% of their body mass without changes in body temperature. We discussed our results in terms of energetic trade-offs and termoregulation strategies.
The development of endothermy during the postnatal period in birds can vary according to the altricial or precocial character of the species. This process has specialimportance in cold environments. In this naper we characterized the development of endothermy in chicks of two antarctic bird species (Daption capense and Pygoscelis papua), and we determined the thermoregulatory response of chicks of D. capense in relation to total food deprivation. Both species reach endothermy approximately at the same age (12 days). The chicks of D.capense with deprivation lost about 30% of their body mass without changes in body temperature. We discussed our results in terms of energetic trade-offs and termoregulation strategies.
Description
Keywords
Termorregulación, Endotermia, Aves
Citation
Serie Científica, nº 47, pp. 31-37, 1997