La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Temporal trends in the timing of autumn migration of short- and long-distance migrating Blackcaps (Sylvia atricapilla)
Auteurs :	Agnieszka Ożarowska, Auteur ; Grzegorz Zaniewicz, Auteur
Type de document :	Article
Dans :	Ornis Fennica (92(3) 2015)
Article en page(s) :	144-152
Résumé :	Several avian species respond in the timing of their annual cycle events to recent climate change and large-scale climate phenomena. We studied autumn migration timing of Blackcaps differentiated by their wing length, i.e., short-, medium- and long-winged individuals. According to the results of previous studies, we assumed short-winged birds as a group, which comprised mostly short-distance migrants spending their winters in the Mediterranean region and long-winged individuals as composed by mostly long-distance migrants wintering in sub-Saharan Africa. We found that all Blackcaps advanced their autumn migration during the 40-year period, but the shift towards earlier dates was nearly two-times greater in short-winged birds (8.8 days) compared to long-winged ones (4.8 days). These results indicate geographical effects in the differential migratory responses of long- and short-distance Blackcaps to environmental changes.

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