La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Barn Owl (Tyto alba) breeding biology in relation to breeding season climate
Auteurs :	Alexandre Chausson, Auteur ; Isabelle Henry, Auteur ; Bettina Almasi, Auteur ; Alexandre Roulin, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (155(1) JAN 2014)
Article en page(s) :	273-281
Langues:	Anglais
Résumé :	Winter weather has a strong influence on Barn Owl (Tyto alba) breeding biology. Here, we analyzed the impacts of weather conditions on reproductive performance during the breeding season using data collected over 22 years in a Swiss Barn Owl population. Variations in rain and temperature during the breeding season played an important role in within-year variation in Barn Owl reproduction. An increase in rainfall during the period from 4 to 2 weeks preceding egg laying had a positive effect on clutch size. In contrast, fledgling body mass was negatively influenced by rainfall during the 24 h preceding the measurements. Finally, ambient temperature during the rearing period was positively associated with brood size at fledging. In conclusion, weather conditions during the breeding season place constraints on Barn Owl reproduction.

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