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Résumé :
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This Taxonomic Research Update draws birdwatchers' attention to the work of Irwin et al. (2001) on Greenish Warblers Phylloscopus trochiloides. Their research shows that two subspecies, P. t. viridanus and P. t. plumbeitarsus, both of which occur as vagrants in western Europe, do not interbreed in the region where their ranges overlap because they do not recognise each other's songs. The subspecies of Greenish Warbler are perhaps the best example of an avian 'ring species', and in this case sexual selection for increased complexity of song is driving the speciation process.
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