La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Effect of age, colony of origin and year on survival of yellow-legged gulls larus michahellis in the bay of biscay
Auteurs :	Leire Juez, Auteur ; Asier Aldalur, Auteur ; Alfredo Herrero, Auteur ; Aitor Galarza, Auteur ; Juan Arizaga, Auteur
Type de document :	Article
Dans :	Ardeola (62(1) JUN 2015)
Article en page(s) :	139-150
Résumé :	We studied sources of variation in apparent local survival of yellow-legged gulls ringed as chicks in a number of colonies with different size trends. Specifically, our aim was to test whether individuals hatched in colonies with decreasing population trends had lower survival rates than those from stable or increasing colonies. from 2006 to 2013, 3,024 chicks were colour-ringed in four colonies along the coast of the Basque Country (from east to west): Ulia, Santa Clara, Guetaria and Izaro. Sighting data of these gulls were compiled from August 2006 to June 2013. Cormack-Jolly-Seber models with mixtures were used to estimate apparent survival (hereafter, survival). Overall, survival differed between two age classes (first-year birds

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