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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Eurasian Reed Warbler: The characters and variation associated with the Asian form fuscus
Auteurs :	David J. Pearson, Auteur ; Brian J. Small, Auteur ; Peter R. Kennerley, Auteur
Type de document :	Article
Dans :	British Birds (95(2) February, 2002)
Article en page(s) :	42-61
Résumé :	This paper discusses the characters of and variation within Reed Warbiers Acrocephalus scirpaceus of the Asian form fuscus. Compiled from extensive data from the wintering and breeding grounds, and on migration, it provides an in-depth treatment of this taxon. Morphological and biometric variation, together with taxonomic status, range, migration patterns, moult and voice, are discussed. The identification of fuscus, along with comparable plumages of the western form scirpaceus and those of Marsh Warbler A. palustris, is discussed in detail. There is considerable variation in both colour and size of Asian populations of fuscus, which is also apparent on the wintering grounds in East Africa, and we have identified typical fuscus, 'warmer fuscus' and 'greyer fuscus' as groups within the population which show constant plumage characters. Nevertheless, only freshly moulted adults in the wintering areas, adults which have recently returned to the Palearctic breeding grounds and first-winters in early autumn, up to November, are likely to be separable from the western form scirpaceus. In western Europe, it is essential that any putative fuscus be examined in the hand, as well as in the field; even then, using conventional means, it is unlikely that geographical provenance will be established with certainty.

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