La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Survival and development of predator avoidance in the post-fledging period of the Whinchat (Saxicola rubetra): consequences for conservation measures
Auteurs :	Davorin Tome, Auteur ; Damijan Denac, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (153(1) JAN 2012)
Article en page(s) :	131-138
Langues:	Anglais
Résumé :	Farmland bird populations in Europe are shrinking, largely due to modern agriculture practices. In grasslands, the shift to early mowing is believed to be particularly responsible for this decline because it is interwoven with breeding time-a change that birds in general have not adapted to. We studied the post-fledging survival of the Whinchat, an altricial grassland passerine. Based on a sample of 74 radiotagged young Whinchats, we confirmed that they fledge at 13-15 days. Twenty-four fledged birds died, while 18 of them were depredated. The survival probability of young Whinchats, calculated using Kaplan-Meier estimates, was lowest during the first day after fledging, and slowly leveled off later. In total, the probability that a juvenile survived the first month after fledging was 0.52. During the first days after fledging, all chicks were found hiding on the ground among the grass stubble. The generalized linear mixed model predicts that half of the fledglings at

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