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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Song ranging by incubating male Blue-headed Vireos: the importance of song representation in repertoires and implications for song delivery patterns and local/foreign dialect discrimination
Auteurs :	Eugene Sillar Morton, Auteur ; Joan Howlett, Auteur ; Nicole Christine Kopysh, Auteur ; Ioana Chiver, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (77(3) SUM 2006)
Article en page(s) :	291-301
Langues:	Anglais
Résumé :	Mechanisms used by birds to rang their distance from singing conspecifics are being debated. In particular, the idea that an incoming song must be in a bird's repertoire for it to be ranged accurately is controversial, but important to our appreciation of the role ranging plays in song evolution. We tested the relation between ranging accuracy and songs in repertoires in playback experiments to male Blue-headed Vireos (Vireo solitarius) whose precise locations were known because they were incubating eggs. Males ranged songs heard while incubating and, when their mates relieved them at the nest, flew directly to the silent playback sites, suggesting that they remembered the locations of simulated intruders. Male vireos approached playback sites of local songs, likely in their own repertoires, more precisely than foreign songs recorded 95-645 km from our study site. Songs included in local and foreign playback tapes differed primarily in frequency modulation, but were similar in other measurements. These results support ranging theory as described by Morton (1986). If the songs within an individual's repertoire are ranged with greater accuracy we discuss how the stability of neighborhoods becomes a factor as to whether or not selection will favor repertoire sharing in song evolution. As well, singing style is affected by ranging. Because Blue-headed Vireos present their songs in a stereotyped order, a listener can compare ordered sequential changes in signal degradation. Comparing degradation in a sequence of songs adds a temporal element that should result in more accurate ranging of the singer's location.

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