Skip to main content

Species-specific song convergence in a moving hybrid zone between two passerines

Buy Article:

$51.00 plus tax (Refund Policy)


Moving hybrid zones are receiving increasing attention. However, so far little is known about the proximate mechanisms underlying these movements. Signalling behaviour, by individuals engaged in interspecific sexual and aggressive interactions, may play a crucial role. In this study, we investigated song variation within a moving hybrid zone between two warblers, Hippolais polyglotta and H. icterina. In these species, song is involved in interspecific territoriality and, probably, in mixed pairings. We showed that allopatric populations of the two species are clearly acoustically differentiated. However, interspecific differences faded out in sympatry as a result of an overall pattern of convergence. Unexpectedly, the two species converged for different song parameters, namely temporal parameters for H. icterina and syntax for H. polyglotta. Hybridization and interspecific competition could explain convergence in H. icterina. Instead, in H. polyglotta we suggest that local adaptation to habitat and interspecific learning might contribute to convergence. We particularly stress that cross-species learning, by maintaining high levels of interspecific interactions, may influence the movement of the zone. ¬© 2003 The Linnean Society of London, Biological Journal of the Linnean Society, 2003, 80, 507–517.

Keywords: Hippolais; hybridization; interspecific interactions; interspecific territoriality; parapatry

Document Type: Research Article


Affiliations: UMR CNRS 5561, Equipe Ecologie Evolutive, Université de Bourgogne, 6, bvd Gabriel, 21000 Dijon, France

Publication date: November 1, 2003

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more