Data from: Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Wouter Halfwerk, Caroline Dingle, Dusan M. Brinkhuizen, Jelmer W. Poelstra, Jan Komdeur & Hans Slabbekoorn
Birdsong is a sexually selected trait that could play an important evolutionary role when related taxa come into secondary contact. Many songbird species however learn their songs through copying one or more tutors, which complicates the evolutionary outcome of such contact. Two subspecies of a presumed vocal learner, the grey-breasted wood-wren (Henicorhina leucophrys), replace each other altitudinally across the western slope of the Ecuadorian Andes. These subspecies are morphologically very similar, but show striking differences...
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