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Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert

The genetic structure of populations of closely related, sympatric species may hold the signature of the geographical mode of the speciation process. In fully allopatric speciation, it is expected that genetic differentiation between species is homogeneously distributed across the genome. In nonallo...

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Autores principales: Luebert, Federico, Jacobs, Pit, Hilger, Hartmut H, Muller, Ludo A H
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons Ltd. 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3925428/
https://www.ncbi.nlm.nih.gov/pubmed/24558582
http://dx.doi.org/10.1002/ece3.929
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author Luebert, Federico
Jacobs, Pit
Hilger, Hartmut H
Muller, Ludo A H
author_facet Luebert, Federico
Jacobs, Pit
Hilger, Hartmut H
Muller, Ludo A H
author_sort Luebert, Federico
collection PubMed
description The genetic structure of populations of closely related, sympatric species may hold the signature of the geographical mode of the speciation process. In fully allopatric speciation, it is expected that genetic differentiation between species is homogeneously distributed across the genome. In nonallopatric speciation, the genomes may remain undifferentiated to a large extent. In this article, we analyzed the genetic structure of five sympatric species from the plant genus Heliotropium in the Atacama Desert. We used amplified fragment length polymorphisms (AFLPs) to characterize the genetic structure of these species and evaluate their genetic differentiation as well as the number of loci subject to positive selection using divergence outlier analysis (DOA). The five species form distinguishable groups in the genetic space, with zones of overlap, indicating that they are possibly not completely isolated. Among-species differentiation accounts for 35% of the total genetic differentiation (F(ST) = 0.35), and F(ST) between species pairs is positively correlated with phylogenetic distance. DOA suggests that few loci are subject to positive selection, which is in line with a scenario of nonallopatric speciation. These results support the idea that sympatric species of Heliotropium sect. Cochranea are under an ongoing speciation process, characterized by a fluctuation of population ranges in response to pulses of arid and humid periods during Quaternary times.
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spelling pubmed-39254282014-02-20 Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert Luebert, Federico Jacobs, Pit Hilger, Hartmut H Muller, Ludo A H Ecol Evol Original Research The genetic structure of populations of closely related, sympatric species may hold the signature of the geographical mode of the speciation process. In fully allopatric speciation, it is expected that genetic differentiation between species is homogeneously distributed across the genome. In nonallopatric speciation, the genomes may remain undifferentiated to a large extent. In this article, we analyzed the genetic structure of five sympatric species from the plant genus Heliotropium in the Atacama Desert. We used amplified fragment length polymorphisms (AFLPs) to characterize the genetic structure of these species and evaluate their genetic differentiation as well as the number of loci subject to positive selection using divergence outlier analysis (DOA). The five species form distinguishable groups in the genetic space, with zones of overlap, indicating that they are possibly not completely isolated. Among-species differentiation accounts for 35% of the total genetic differentiation (F(ST) = 0.35), and F(ST) between species pairs is positively correlated with phylogenetic distance. DOA suggests that few loci are subject to positive selection, which is in line with a scenario of nonallopatric speciation. These results support the idea that sympatric species of Heliotropium sect. Cochranea are under an ongoing speciation process, characterized by a fluctuation of population ranges in response to pulses of arid and humid periods during Quaternary times. John Wiley & Sons Ltd. 2014-02 2013-12-29 /pmc/articles/PMC3925428/ /pubmed/24558582 http://dx.doi.org/10.1002/ece3.929 Text en © 2013 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Luebert, Federico
Jacobs, Pit
Hilger, Hartmut H
Muller, Ludo A H
Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title_full Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title_fullStr Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title_full_unstemmed Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title_short Evidence for nonallopatric speciation among closely related sympatric Heliotropium species in the Atacama Desert
title_sort evidence for nonallopatric speciation among closely related sympatric heliotropium species in the atacama desert
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3925428/
https://www.ncbi.nlm.nih.gov/pubmed/24558582
http://dx.doi.org/10.1002/ece3.929
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