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Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses

Ancient origins, profound ecological divergence, and extensive hybridization make the fire‐bellied toads Bombina bombina and B. variegata (Anura: Bombinatoridae) an intriguing test case of ecological speciation. Previous modeling has proposed that the narrow Bombina hybrid zones represent strong bar...

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Autores principales: Nürnberger, Beate, Lohse, Konrad, Fijarczyk, Anna, Szymura, Jacek M., Blaxter, Mark L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5129456/
https://www.ncbi.nlm.nih.gov/pubmed/27282112
http://dx.doi.org/10.1111/evo.12978
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author Nürnberger, Beate
Lohse, Konrad
Fijarczyk, Anna
Szymura, Jacek M.
Blaxter, Mark L.
author_facet Nürnberger, Beate
Lohse, Konrad
Fijarczyk, Anna
Szymura, Jacek M.
Blaxter, Mark L.
author_sort Nürnberger, Beate
collection PubMed
description Ancient origins, profound ecological divergence, and extensive hybridization make the fire‐bellied toads Bombina bombina and B. variegata (Anura: Bombinatoridae) an intriguing test case of ecological speciation. Previous modeling has proposed that the narrow Bombina hybrid zones represent strong barriers to neutral introgression. We test this prediction by inferring the rate of gene exchange between pure populations on either side of the intensively studied Kraków transect. We developed a method to extract high confidence sets of orthologous genes from de novo transcriptome assemblies, fitted a range of divergence models to these data and assessed their relative support with analytic likelihood calculations. There was clear evidence for postdivergence gene flow, but, as expected, no perceptible signal of recent introgression via the nearby hybrid zone. The analysis of two additional Bombina taxa (B. v. scabra and B. orientalis) validated our parameter estimates against a larger set of prior expectations. Despite substantial cumulative introgression over millions of years, adaptive divergence of the hybridizing taxa is essentially unaffected by their lack of reproductive isolation. Extended distribution ranges also buffer them against small‐scale environmental perturbations that have been shown to reverse the speciation process in other, more recent ecotypes.
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spelling pubmed-51294562016-11-30 Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses Nürnberger, Beate Lohse, Konrad Fijarczyk, Anna Szymura, Jacek M. Blaxter, Mark L. Evolution Original Articles Ancient origins, profound ecological divergence, and extensive hybridization make the fire‐bellied toads Bombina bombina and B. variegata (Anura: Bombinatoridae) an intriguing test case of ecological speciation. Previous modeling has proposed that the narrow Bombina hybrid zones represent strong barriers to neutral introgression. We test this prediction by inferring the rate of gene exchange between pure populations on either side of the intensively studied Kraków transect. We developed a method to extract high confidence sets of orthologous genes from de novo transcriptome assemblies, fitted a range of divergence models to these data and assessed their relative support with analytic likelihood calculations. There was clear evidence for postdivergence gene flow, but, as expected, no perceptible signal of recent introgression via the nearby hybrid zone. The analysis of two additional Bombina taxa (B. v. scabra and B. orientalis) validated our parameter estimates against a larger set of prior expectations. Despite substantial cumulative introgression over millions of years, adaptive divergence of the hybridizing taxa is essentially unaffected by their lack of reproductive isolation. Extended distribution ranges also buffer them against small‐scale environmental perturbations that have been shown to reverse the speciation process in other, more recent ecotypes. John Wiley and Sons Inc. 2016-07-08 2016-08 /pmc/articles/PMC5129456/ /pubmed/27282112 http://dx.doi.org/10.1111/evo.12978 Text en © 2016 The Author(s). Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Nürnberger, Beate
Lohse, Konrad
Fijarczyk, Anna
Szymura, Jacek M.
Blaxter, Mark L.
Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title_full Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title_fullStr Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title_full_unstemmed Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title_short Para‐allopatry in hybridizing fire‐bellied toads (Bombina bombina and B. variegata): Inference from transcriptome‐wide coalescence analyses
title_sort para‐allopatry in hybridizing fire‐bellied toads (bombina bombina and b. variegata): inference from transcriptome‐wide coalescence analyses
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5129456/
https://www.ncbi.nlm.nih.gov/pubmed/27282112
http://dx.doi.org/10.1111/evo.12978
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