La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Why should Greylag Goose Anser anser parents rear offspring of others?
Auteurs :	L. Nilsson, Auteur ; H. Kampe-Persson, Auteur
Type de document :	Article
Dans :	Wildfowl (54 2003)
Article en page(s) :	25-37
Langues:	Anglais
Résumé :	The benefits and costs of rearing large broods were studied in a population of neck collared Greylag Geese in Scania, southernmost Sweden. Families were divided into four groups according to brood size: 1-4, 5-8, 9-12 and >12 young. Gosling survival showed a significant positive relationship with brood size on arrival at the rearing area. First-year and third-year local survival, as well as breeding recruitment, showed a significant positive relationships with brood size at fledging. For adults rearing large broods, no costs were detected during the year following that when they fledged >8 young; both survival rate and reproductive success exceeded the long-term averages.

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