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The population genetics of speciation by cascade reinforcement

Species interactions drive diverse evolutionary outcomes. Speciation by cascade reinforcement represents one example of how species interactions can contribute to the proliferation of species. This process occurs when the divergence of mating traits in response to selection against interspecific hyb...

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Autores principales: Anderson, Carlie B., Ospina, Oscar, Beerli, Peter, Lemmon, Alan R., Banker, Sarah E., Hassinger, Alyssa Bigelow, Dye, Mysia, Kortyna, Michelle L., Lemmon, Emily Moriarty
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9905665/
https://www.ncbi.nlm.nih.gov/pubmed/36789346
http://dx.doi.org/10.1002/ece3.9773
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author Anderson, Carlie B.
Ospina, Oscar
Beerli, Peter
Lemmon, Alan R.
Banker, Sarah E.
Hassinger, Alyssa Bigelow
Dye, Mysia
Kortyna, Michelle L.
Lemmon, Emily Moriarty
author_facet Anderson, Carlie B.
Ospina, Oscar
Beerli, Peter
Lemmon, Alan R.
Banker, Sarah E.
Hassinger, Alyssa Bigelow
Dye, Mysia
Kortyna, Michelle L.
Lemmon, Emily Moriarty
author_sort Anderson, Carlie B.
collection PubMed
description Species interactions drive diverse evolutionary outcomes. Speciation by cascade reinforcement represents one example of how species interactions can contribute to the proliferation of species. This process occurs when the divergence of mating traits in response to selection against interspecific hybridization incidentally leads to reproductive isolation among populations of the same species. Here, we investigated the population genetic outcomes of cascade reinforcement in North American chorus frogs (Hylidae: Pseudacris). Specifically, we estimated the frequency of hybridization among three taxa, assessed genetic structure within the focal species, P. feriarum, and ascertained the directionality of gene flow within P. feriarum across replicated contact zones via coalescent modeling. Through field observations and preliminary experimental crosses, we assessed whether hybridization is possible under natural and laboratory conditions. We found that hybridization occurs among P. feriarum and two conspecifics at a low rate in multiple contact zones, and that gene flow within the former species is unidirectional from allopatry into sympatry with these other species in three of four contact zones studied. We found evidence of substantial genetic structuring within P. feriarum including a divergent western allopatric cluster, a behaviorally‐distinct sympatric South Carolina cluster, and several genetically‐overlapping clusters from the remainder of the distribution. Furthermore, we found sub‐structuring between reinforced and nonreinforced populations in the two most intensely‐sampled contact zones. Our literature review indicated that P. feriarum hybridizes with at least five heterospecifics at the periphery of its range providing a mechanism for further intraspecific diversification. This work strengthens the evidence for cascade reinforcement in this clade, revealing the geographic and genetic landscape upon which this process can contribute to the proliferation of species.
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spelling pubmed-99056652023-02-13 The population genetics of speciation by cascade reinforcement Anderson, Carlie B. Ospina, Oscar Beerli, Peter Lemmon, Alan R. Banker, Sarah E. Hassinger, Alyssa Bigelow Dye, Mysia Kortyna, Michelle L. Lemmon, Emily Moriarty Ecol Evol Research Articles Species interactions drive diverse evolutionary outcomes. Speciation by cascade reinforcement represents one example of how species interactions can contribute to the proliferation of species. This process occurs when the divergence of mating traits in response to selection against interspecific hybridization incidentally leads to reproductive isolation among populations of the same species. Here, we investigated the population genetic outcomes of cascade reinforcement in North American chorus frogs (Hylidae: Pseudacris). Specifically, we estimated the frequency of hybridization among three taxa, assessed genetic structure within the focal species, P. feriarum, and ascertained the directionality of gene flow within P. feriarum across replicated contact zones via coalescent modeling. Through field observations and preliminary experimental crosses, we assessed whether hybridization is possible under natural and laboratory conditions. We found that hybridization occurs among P. feriarum and two conspecifics at a low rate in multiple contact zones, and that gene flow within the former species is unidirectional from allopatry into sympatry with these other species in three of four contact zones studied. We found evidence of substantial genetic structuring within P. feriarum including a divergent western allopatric cluster, a behaviorally‐distinct sympatric South Carolina cluster, and several genetically‐overlapping clusters from the remainder of the distribution. Furthermore, we found sub‐structuring between reinforced and nonreinforced populations in the two most intensely‐sampled contact zones. Our literature review indicated that P. feriarum hybridizes with at least five heterospecifics at the periphery of its range providing a mechanism for further intraspecific diversification. This work strengthens the evidence for cascade reinforcement in this clade, revealing the geographic and genetic landscape upon which this process can contribute to the proliferation of species. John Wiley and Sons Inc. 2023-02-07 /pmc/articles/PMC9905665/ /pubmed/36789346 http://dx.doi.org/10.1002/ece3.9773 Text en © 2023 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Anderson, Carlie B.
Ospina, Oscar
Beerli, Peter
Lemmon, Alan R.
Banker, Sarah E.
Hassinger, Alyssa Bigelow
Dye, Mysia
Kortyna, Michelle L.
Lemmon, Emily Moriarty
The population genetics of speciation by cascade reinforcement
title The population genetics of speciation by cascade reinforcement
title_full The population genetics of speciation by cascade reinforcement
title_fullStr The population genetics of speciation by cascade reinforcement
title_full_unstemmed The population genetics of speciation by cascade reinforcement
title_short The population genetics of speciation by cascade reinforcement
title_sort population genetics of speciation by cascade reinforcement
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9905665/
https://www.ncbi.nlm.nih.gov/pubmed/36789346
http://dx.doi.org/10.1002/ece3.9773
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