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Type: Journal article
Title: Molecular patterns of introgression in a classic hybrid zone between the Australian tree frogs, Litoria ewingii and L. paraewingi: Evidence of a tension zone
Author: Smith, K.
Hale, J.
Kearney, M.
Austin, J.
Melville, J.
Citation: Molecular Ecology, 2013; 22(7):1869-1883
Publisher: Blackwell Publishing Ltd
Issue Date: 2013
ISSN: 0962-1083
Statement of
Katie L. Smith, Joshua M. Hale, Michael R. Kearney, Jeremy J. Austin, Jane Melville
Abstract: Hybrid zones provide a rare opportunity to explore the processes involved in reproductive isolation and speciation. The southern hybrid zone between the southeastern Australian tree frogs Litoria ewingii and L. paraewingi has been comprehensively studied over the last 40 years, primarily using reproductive compatibility experiments and male advertisement calls. We used mitochondrial DNA (mtDNA) and eight nuclear microsatellite markers to characterize this hybrid zone along a historically studied transect and to test various dispersal-dependent and dispersal-independent hybrid zone models. The species are genetically distinct and the level of hybridization within the contact zone is low, with the majority of admixed individuals representing later-generation hybrids. Based on previous experimental genetic compatibility studies, we predicted that hybrids with L. paraewingi mtDNA would be more frequent than hybrids with L. ewingii mtDNA. Surprisingly, a greater proportion of the identified hybrids had L. ewingii mtDNA. Geographical cline analyses showed a sharp transition in allele frequencies across the transect, and both the mtDNA and microsatellite data showed concordant cline centres, but were best supported by a model that allowed width to vary. Overall, the L. ewingii-L. paraewingi hybrid zone is best characterized as a tension zone, due to the narrow cline width, concordant genetic clines and low levels of hybridization.
Keywords: cline; hybrid zone; microsatellite; tension zone
Rights: © Blackwell Publishing Ltd
RMID: 0020126491
DOI: 10.1111/mec.12176
Appears in Collections:IPAS publications
Environment Institute Leaders publications

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