Journal article
Diversification and asymmetrical gene flow across time and space: lineage sorting and hybridization in polytypic barking frogs
Molecular ecology, Vol.23(13), pp.3273-3291
07/2014
Handle:
https://hdl.handle.net/2376/104431
PMID: 24891255
Abstract
Young species complexes that are widespread across ecologically disparate regions offer important insights into the process of speciation because of their relevance to how local adaptation and gene flow influence diversification. We used mitochondrial DNA and up to 28 152 genomewide single nucleotide polymorphisms from polytypic barking frogs (Craugastor augusti complex) to infer phylogenetic relationships and test for the signature of introgressive hybridization among diverging lineages. Our phylogenetic reconstructions suggest (i) a rapid Pliocene–Pleistocene radiation that produced at least nine distinct lineages and (ii) that geographic features of the arid Central Mexican Plateau contributed to two independent northward expansions. Despite clear lineage differentiation (many private alleles and high between‐lineage FST scores), D‐statistic tests, which differentiate introgression from ancestral polymorphism, allowed us to identify two putative instances of reticulate gene flow. Partitioned D‐statistics provided evidence that these events occurred in the same direction between clades but at different points in time. After correcting for geographic distance, we found that lineages involved in hybrid gene flow interactions had higher levels of genetic variation than independently evolving lineages. These findings suggest that the nature of hybrid compatibility can be conserved overlong periods of evolutionary time and that hybridization between diverging lineages may contribute to standing levels of genetic variation.
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Details
- Title
- Diversification and asymmetrical gene flow across time and space: lineage sorting and hybridization in polytypic barking frogs
- Creators
- Jeffrey W Streicher - The University of Texas at ArlingtonThomas J Devitt - The University of Texas at AustinCaren S Goldberg - University of IdahoJohn H Malone - University of ConnecticutHeath Blackmon - The University of Texas at ArlingtonMatthew K Fujita - The University of Texas at Arlington
- Publication Details
- Molecular ecology, Vol.23(13), pp.3273-3291
- Academic Unit
- Environment, School of the (CAHNRS)
- Number of pages
- 19
- Grant note
- Texas Parks and Wildlife Natural Resources Program Society for the Study of Amphibians and Reptiles Texas Herpetological Society New Mexico Game and Fish East Texas Herpetological Society UC MEXUSCONACyT postdoctoral fellowship AMNH Theodore Roosevelt NSF (DEB‐0102383; DEB‐0613802)
- Identifiers
- 99900546823801842
- Language
- English
- Resource Type
- Journal article