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Little or no gene flow despite F(1) hybrids at two interspecific contact zones

Hybridization can create the selective force that promotes assortative mating but hybridization can also select for increased hybrid fitness. Gene flow resulting from hybridization can increase genetic diversity but also reduce distinctiveness. Thus the formation of hybrids has important implication...

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Autores principales: Mckean, Natasha E., Trewick, Steven A., Morgan‐Richards, Mary
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/PMC4783458/
https://www.ncbi.nlm.nih.gov/pubmed/27066230
http://dx.doi.org/10.1002/ece3.1942
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author Mckean, Natasha E.
Trewick, Steven A.
Morgan‐Richards, Mary
author_facet Mckean, Natasha E.
Trewick, Steven A.
Morgan‐Richards, Mary
author_sort Mckean, Natasha E.
collection PubMed
description Hybridization can create the selective force that promotes assortative mating but hybridization can also select for increased hybrid fitness. Gene flow resulting from hybridization can increase genetic diversity but also reduce distinctiveness. Thus the formation of hybrids has important implications for long‐term species coexistence. This study compares the interaction between the tree wētā Hemideina thoracica and its two neighboring species; H. crassidens and H. trewicki. We examined the ratio of parent and hybrid forms in natural areas of sympatry. Individuals with intermediate phenotype were confirmed as first generation hybrids using nine independent genetic markers. Evidence of gene flow from successful hybridization was sought from the distribution of morphological and genetic characters. Both species pairs appear to be largely retaining their own identity where they live in sympatry, each with a distinct karyotype. Hemideina thoracica and H. trewicki are probably reproductively isolated, with sterile F(1) hybrids. This species pair shows evidence of niche differences with adult size and timing of maturity differing where Hemideina thoracica is sympatric with H. trewicki. In contrast, evidence of a low level of introgression was detected in phenotypes and genotypes where H. thoracica and H. crassidens are sympatric. We found no evidence of size divergence although color traits in combination with hind tibia spines reliably distinguish the two species. This species pair show a bimodal hybrid zone in the absence of assortative mating and possible sexual exclusion by H. thoracica males in the formation of F(1) hybrids.
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spelling pubmed-47834582016-04-08 Little or no gene flow despite F(1) hybrids at two interspecific contact zones Mckean, Natasha E. Trewick, Steven A. Morgan‐Richards, Mary Ecol Evol Original Research Hybridization can create the selective force that promotes assortative mating but hybridization can also select for increased hybrid fitness. Gene flow resulting from hybridization can increase genetic diversity but also reduce distinctiveness. Thus the formation of hybrids has important implications for long‐term species coexistence. This study compares the interaction between the tree wētā Hemideina thoracica and its two neighboring species; H. crassidens and H. trewicki. We examined the ratio of parent and hybrid forms in natural areas of sympatry. Individuals with intermediate phenotype were confirmed as first generation hybrids using nine independent genetic markers. Evidence of gene flow from successful hybridization was sought from the distribution of morphological and genetic characters. Both species pairs appear to be largely retaining their own identity where they live in sympatry, each with a distinct karyotype. Hemideina thoracica and H. trewicki are probably reproductively isolated, with sterile F(1) hybrids. This species pair shows evidence of niche differences with adult size and timing of maturity differing where Hemideina thoracica is sympatric with H. trewicki. In contrast, evidence of a low level of introgression was detected in phenotypes and genotypes where H. thoracica and H. crassidens are sympatric. We found no evidence of size divergence although color traits in combination with hind tibia spines reliably distinguish the two species. This species pair show a bimodal hybrid zone in the absence of assortative mating and possible sexual exclusion by H. thoracica males in the formation of F(1) hybrids. John Wiley and Sons Inc. 2016-03-09 /pmc/articles/PMC4783458/ /pubmed/27066230 http://dx.doi.org/10.1002/ece3.1942 Text en © 2016 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. 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 Research
Mckean, Natasha E.
Trewick, Steven A.
Morgan‐Richards, Mary
Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title_full Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title_fullStr Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title_full_unstemmed Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title_short Little or no gene flow despite F(1) hybrids at two interspecific contact zones
title_sort little or no gene flow despite f(1) hybrids at two interspecific contact zones
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4783458/
https://www.ncbi.nlm.nih.gov/pubmed/27066230
http://dx.doi.org/10.1002/ece3.1942
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