La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Garden Warbler Sylvia borin sings similar to Booted Warbler Hippolais caligata.
Auteurs :	Klemens Steiof, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (130(3) 2009)
Article en page(s) :	141-146
Résumé :	An intensively singing Garden Warbler was seen and heard from 9(th) to 13(th) June 2006 near Munich airport (Bavaria, Germany). The bird did not show any normal song phrase. Instead, the phrases were similar to the "hectic and scratchy" phrases of Booted Warbler, also resembling songs of the small Sylvia Warblers, e. g. Dartford Warbler S. undata. The frequency of the phrases was slightly higher pitched than the regular song of Garden Warbler. Some phrases of the bird were tape recorded. The sonagrams underline the similarity to the other species.Garden Warbler is prone to the occurrence of "mystery singers" RHEINWALD et al. (2009) summarise 34 different indivuduals in Europe within the last 60 years. Although there are many similarities, they differenciate some types of the aberrant songs. It is hard to explain this phenomenon. Maybe the reason is a mutation, which is still detectable as a Garden Warbler, because at least two of the songsters where paired and raised offspring. It appears to be less likely, that imitation of other species or deafness of the birds are reasons behind the mystery singers.

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