La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Adult Brunnich's Guillemots Uria lomvia balance body condition and investment in chick growth
Auteurs :	A. J. Gaston, Auteur ; J. M. Hipfner, Auteur
Type de document :	Article
Dans :	Ibis (148(1) JAN 2006)
Article en page(s) :	106-113
Résumé :	To investigate the covariation of adult body condition and nestling growth, we weighed adult Brunnich's Guillemots Uria lomvia rearing chicks at Coats Island, Nunavut, Canada, each year between 1988 and 2002. We estimated chick mass at 14 days for a sample of chicks reared in the same years. Adult mass and chick mass at 14 days were highly correlated, suggesting that, as feeding conditions deteriorate, adults compromise by reducing their own body reserves, while at the same time delivering less food to their offspring. We compared the prediction of the least-squares regression for the Coats Island data with observations made at Digges Island, a much larger colony about 300 km away, where birds are similar in linear body measurements to those at Coats Island and have a similar body mass while incubating. Adult mass at Digges Island averaged 11% less during chick-rearing than during incubation, compared with only a 5% difference at Coats Island. Mean chick mass at

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