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Reproductive isolation and cryptic introgression in a sky island enclave of Appalachian birds

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dc.contributor.author Davidson, Brian S. en
dc.contributor.author Sattler, Gene D. en
dc.contributor.author Via, Sara en
dc.contributor.author Braun, Michael J. en
dc.date.accessioned 2018-08-31T18:25:14Z
dc.date.available 2018-08-31T18:25:14Z
dc.date.issued 2013
dc.identifier.citation Davidson, Brian S., Sattler, Gene D., Via, Sara, and Braun, Michael J. 2013. "Reproductive isolation and cryptic introgression in a sky island enclave of Appalachian birds." <em>Ecology and Evolution</em>. 3 (8):2485&ndash;2496. <a href="https://doi.org/10.1002/ece3.604">https://doi.org/10.1002/ece3.604</a> en
dc.identifier.issn 2045-7758
dc.identifier.uri https://hdl.handle.net/10088/77007
dc.description.abstract Reproductive isolation is central to the speciation process, and cases where the strength of reproductive isolation varies geographically can inform our understanding of speciation mechanisms. Although generally treated as separate species, Black-capped chickadees (Poecile atricapillus) and Carolina chickadees (P. carolinensis) hybridize and undergo genetic introgression in many areas where they come into contact across the eastern United States and in the northern Appalachian Mountains. The Great Smoky Mountains harbor the last large breeding population of atricapillus in the southern Appalachians, isolated from the species' main range by nearly 200 km. This population is believed to be reproductively isolated from local carolinensis due to an unusual, behaviorally mediated elevational range gap, which forms during the breeding season and may function as an incipient reproductive isolating mechanism. We examined the effectiveness of this putative isolating mechanism by looking for genetic introgression from carolinensis in Great Smoky Mountain atricapillus. We characterized this population and parental controls genetically using hundreds of amplified fragment length polymorphism (AFLP) loci as well as mitochondrial DNA (mtDNA) sequence data from cytochrome-b. Great Smoky Mountain atricapillus have experienced nuclear genetic introgression from carolinensis, but at much lower levels than other populations near the hybrid zone to the north. No mitochondrial introgression was detected, in contrast to northern contact areas. Thus, the seasonal elevational range gap appears to have been effective in reducing gene flow between these closely related taxa. en
dc.relation.ispartof Ecology and Evolution en
dc.title Reproductive isolation and cryptic introgression in a sky island enclave of Appalachian birds en
dc.type Journal Article en
dc.identifier.srbnumber 116378
dc.identifier.doi 10.1002/ece3.604
rft.jtitle Ecology and Evolution
rft.volume 3
rft.issue 8
rft.spage 2485
rft.epage 2496
dc.description.SIUnit NH-Vertebrate Zoology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 2485
dc.citation.epage 2496

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