A ten-year study of the Aquatic Warbler Acrocephalus paludicola at the Donges ringing station (Loire estuary. West France) [Résultat de 10 ans de suivi du Phragmite aquatique Acrocephalus paludicola à la station de baguage de Donges dans lEstuaire de la loire]
Foucher J.,Recherche Ornithologique Loire et Atlantique ACROLA |
Jaguenet E.,Recherche Ornithologique Loire et Atlantique ACROLA |
Boucaux M.,Recherche Ornithologique Loire et Atlantique ACROLA |
Giraudot E.,Recherche Ornithologique Loire et Atlantique ACROLA |
And 5 more authors.
Alauda | Year: 2014
The Aquatic Warbler Acrocephalus paludicola is a threatened long-distance migrant. Climate changes as well as loss of breeding, wintering and staging habitats have dramatic consequences on its populations. Recent studies showed that France hosts some major migratory staging sites, especially those located in the Loire estuary. In this context, the ACROLA project performed investigations on this small passerine in order to analyze the migration of individuals using staging sites in West France and to assess the impact of climate change by the North Atlantic Oscillation index. A ten-year study was thus carried out. The migration period takes place during the whole month of August. Generally the adults arrive earlier than the juveniles although some adult females are caught in September. The Donges marshland is considered as a crucial staging site for many individuals. These birds rest in reedbeds and feed in Scirpa-habitats before resuming their postnuptial migration. Other birds perform longer distance in search of favourable habitats and exploit neighbouring marshlands some 50km distant. Moreover, the change in NAO index results in earlier dates of arrival and influences the breeding success.