Asymmetric Introgression Between Fishes in the Red River Basin of Texas is Associated with Variation in Water Quality

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dc.contributor.authorSotola, V. Alex
dc.contributor.authorRuppel, David S.
dc.contributor.authorBonner, Timothy H.
dc.contributor.authorNice, Chris C.
dc.contributor.authorMartin, Noland H.
dc.date.accessioned2019-07-31T17:18:12Z
dc.date.available2019-07-31T17:18:12Z
dc.date.issued2019-01
dc.description.abstractWhen ecologically divergent taxa encounter one another, hybrid zones can form when reproductive isolation is incomplete. The location of such hybrid zones can be influenced by environmental variables, and an ecological context can provide unique insights into the mechanisms by which species diverge and are maintained. Two ecologically differentiated species of small benthic fishes, the endemic and imperiled prairie chub, Macrhybopsis australis, and the shoal chub, Macrhybopsis hyostoma, are locally sympatric within the upper Red River Basin of Texas. We integrated popula‐ tion genomic data and environmental data to investigate species divergence and the maintenance of species boundaries in these two species. We found evidence of advanced‐generation asymmetric hybridization and introgression, with shoal chub al‐ leles introgressing more frequently into prairie chubs than the reciprocal. Using a Bayesian Genomic Cline framework, patterns of genomic introgression were revealed to be quite heterogeneous, yet shoal chub alleles were found to have likely selectively introgressed across species boundaries significantly more often than prairie chub alleles, potentially explaining some of the observed asymmetry in hybridization. These patterns were remarkably consistent across two sampled geographic regions of hybridization. Several environmental variables were found to significantly predict individual admixture, suggesting ecological isolation might maintain species boundaries.
dc.description.departmentBiology
dc.formatText
dc.format.extent13 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationSotola, V. A., Ruppel, D. S., Bonner, T. H., Nice, C. C., & Martin, N. H. (2019). Asymmetric introgression between fishes in the Red River basin of Texas is associated with variation in water quality. Ecology and Evolution, 9(4), pp. 2083–2095.
dc.identifier.doihttps://doi.org/10.1002/ece3.4901
dc.identifier.urihttps://hdl.handle.net/10877/8430
dc.language.isoen
dc.publisherWiley
dc.rights.holder© 2019 The Authors.
dc.rights.licenseThis work is licensed under a Creative Commons Attribution 3.0 United States License.
dc.sourceEcology and Evolution, 2019, Vol. 9, No. 4, pp. 2083–2095.
dc.subjectgenetic structure
dc.subjecthybridization
dc.subjectintrogression
dc.subjectwater quality variation
dc.subjectfish
dc.titleAsymmetric Introgression Between Fishes in the Red River Basin of Texas is Associated with Variation in Water Quality
dc.typeArticle

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