Summary
Sonographic analyses of songs and calls of Bonelli's Warbler (Phylloscopus bonelli) show important structural differences between the geographically isolated western (P.b. bonelli) and eastern (P.b. orientalis) populations. Playback experiments in the field and some morphological differences suggest that these populations may be separating into 2 species.
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Part of this paper was presented at the Annual Meeting of the Deutsche Ornithologen-Gesellschaft in Hannover, September 18/23, 1980 (H.-W. H.).
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Supported by the Deutsche Forschungsgemeinschaft (H.-H.B. and J.M.).
The authors wish to thank Dr D. Graham for his help in the translation.
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Helb, H.W., Bergmann, H.H. & Martens, J. Acoustic differences between populations of western and eastern Bonelli's Warblers (Phylloscopus bonelli, Sylviidae). Experientia 38, 356–357 (1982). https://doi.org/10.1007/BF01949390
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DOI: https://doi.org/10.1007/BF01949390