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Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus

Different mechanisms such as selection or genetic drift permitted e.g. by geographical isolation can lead to differentiation of populations and could cause subsequent speciation. The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and...

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Autores principales: Eweleit, Lucienne, Reinhold, Klaus, Sauer, Jan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4593647/
https://www.ncbi.nlm.nih.gov/pubmed/26436732
http://dx.doi.org/10.1371/journal.pone.0139494
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author Eweleit, Lucienne
Reinhold, Klaus
Sauer, Jan
author_facet Eweleit, Lucienne
Reinhold, Klaus
Sauer, Jan
author_sort Eweleit, Lucienne
collection PubMed
description Different mechanisms such as selection or genetic drift permitted e.g. by geographical isolation can lead to differentiation of populations and could cause subsequent speciation. The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated. Therefore, P. veluchianus is suitable to investigate an ongoing speciation process. We based our analysis on sequences of the internal transcribed spacer (ITS) and the mitochondrial control region (CR). The population genetic analysis based on the nuclear marker ITS revealed a barrier to gene flow within the range of Poecilimon veluchianus, which corresponds well to the described subspecies. In contrast to the results based on the nuclear ITS marker, the mitochondrial CR marker does not clearly support the separation into two subspecies with restricted gene flow and a clear contact zone. Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker). The population genetic analysis based on the nuclear marker ITS also suggests the existence of hybrids in the wild. Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation.
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spelling pubmed-45936472015-10-14 Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus Eweleit, Lucienne Reinhold, Klaus Sauer, Jan PLoS One Research Article Different mechanisms such as selection or genetic drift permitted e.g. by geographical isolation can lead to differentiation of populations and could cause subsequent speciation. The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated. Therefore, P. veluchianus is suitable to investigate an ongoing speciation process. We based our analysis on sequences of the internal transcribed spacer (ITS) and the mitochondrial control region (CR). The population genetic analysis based on the nuclear marker ITS revealed a barrier to gene flow within the range of Poecilimon veluchianus, which corresponds well to the described subspecies. In contrast to the results based on the nuclear ITS marker, the mitochondrial CR marker does not clearly support the separation into two subspecies with restricted gene flow and a clear contact zone. Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker). The population genetic analysis based on the nuclear marker ITS also suggests the existence of hybrids in the wild. Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation. Public Library of Science 2015-10-05 /pmc/articles/PMC4593647/ /pubmed/26436732 http://dx.doi.org/10.1371/journal.pone.0139494 Text en © 2015 Eweleit et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Eweleit, Lucienne
Reinhold, Klaus
Sauer, Jan
Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title_full Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title_fullStr Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title_full_unstemmed Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title_short Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus
title_sort speciation progress: a case study on the bushcricket poecilimon veluchianus
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4593647/
https://www.ncbi.nlm.nih.gov/pubmed/26436732
http://dx.doi.org/10.1371/journal.pone.0139494
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