La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Interspecific territoriality by mixed-singing and song-switching Willow Warblers: a possible case of character convergence (2018)
Auteurs :	Michael R. Lawn, Auteur
Type de document :	Article
Dans :	British Birds (111(6) JUN 2018)
Article en page(s) :	339-348
Langues:	Anglais
Résumé :	Observations of two mixed-singing Willow Warblers Phylloscopus trochilus in Surrey indicated that both birds were interspecifically territorial with Common Chiffchaffs P. collybita, whereas normal Willow Warblers were not obviously so. One of the mixed-singers was already under observation prior to the use of Chiffchaff-type song, enabling the development of mixed singing to be documented. The 'misdirected song learning' hypothesis did not explain all the observations, and it is suggested that the birds' behaviour, considered together with habitat and population changes, is consistent with 'character convergence'.

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