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Brian S. Davidson, Gene D. Sattler, Sara Via and Michael J. Braun Reproductive isolation and cryptic introgression in a sky island enclave of Appalachian birds Ecology and Evolution 3

Article first published online: 26 JUN 2013 | DOI: 10.1002/ece3.604

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Black-capped chickadees (Poecile atricapillus) hybridize with Carolina chickadees (P. carolinensis) in the northern Appalachian Mountains. We use genetic data to show that the last large breeding population of atricapillus in the southern Appalachians has experienced genetic introgression from carolinensis, but at a much lower level than populations to the north, confirming that the southern populations are reproductively isolated due to a behaviorally mediated elevational range gap during the breeding season.

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