La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Massive immigration balances high anthropogenic mortality in a stable eagle owl population: Lessons for conservation
Auteurs :	Michael Schaub, Auteur ; Adrian Aebischer, Auteur ; Olivier Gimenez, Auteur ; Silvia Berger, Auteur ; Raphaël Arlettaz, Auteur
Type de document :	Article
Dans :	Biological Conservation (143(8) AUG 2010)
Article en page(s) :	1911-1918
Langues:	Anglais
Résumé :	The modern anthropized landscape is a major source of hazards for large animals such as raptors. Collisions with cables, vehicles and trains, as well as electrocution cause casualties, which may negatively impact populations. Yet, demographic studies of that impact remain scarce, which is an impediment to evidence-based conservation action. We studied the dynamics of an eagle owl (Bubo bubo) population in the northwestern Alps (Switzerland). We estimated, firstly, its demographic parameters using a Bayesian integrated population model; secondly, the frequency of different types of casualty through radio-tracking. Thirdly, we investigated the effects of reductions of human-related mortality on population trends. The breeding population was small but remained fairly stable during 20 years, suggesting that it was apparently in a good shape. However, survival probabilities of all age classes were very low (

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