La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Birds of a feather winter together: migratory connectivity in the Reed Warbler Acrocephalus scirpaceus
Auteurs :	Petr Procházka, Auteur ; Keith A. Hobson, Auteur ; Zsolt Karcza, Auteur ; Jelena Kralj, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (149(2) APR 2008)
Article en page(s) :	141-150
Langues:	Anglais
Résumé :	To investigate migratory connectivity in the Reed Warbler Acrocephalus scirpaceus, we analysed (1) all available sub-Saharan ringing recoveries and (2) stable isotopes in feathers grown in Africa sampled at 17 European breeding sites across a migratory divide. A cluster analysis of ringing recoveries showed remarkable connectivity between breeding and non-breeding grounds. Two main clusters represented populations taking the two main migratory routes [southwesterly (SW) and southeasterly (SE)]. Stable isotope analysis confirmed the separation of wintering areas of SW- and SE-migrating populations. Higher delta(15) N values in feathers of SE-migrating birds indicated that they occupied more xeric biome types. Values of delta(13) C that did not differ significantly among populations were higher than those from feathers of known European origin and indicated a C4 biome. Three populations with an unknown migratory direction were assigned to the SE-migrating populations on the basis of delta(15) N values.

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