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Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width
The Crassulacean genus Aeonium is a well‐known example for plant species radiation on oceanic archipelagos. However, while allopatric speciation among islands is documented for this genus, the role of intra‐island speciation due to population divergence by topographical isolation or ecological heter...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4667834/ https://www.ncbi.nlm.nih.gov/pubmed/26664682 http://dx.doi.org/10.1002/ece3.1682 |
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author | Harter, David E. V. Thiv, Mike Weig, Alfons Jentsch, Anke Beierkuhnlein, Carl |
author_facet | Harter, David E. V. Thiv, Mike Weig, Alfons Jentsch, Anke Beierkuhnlein, Carl |
author_sort | Harter, David E. V. |
collection | PubMed |
description | The Crassulacean genus Aeonium is a well‐known example for plant species radiation on oceanic archipelagos. However, while allopatric speciation among islands is documented for this genus, the role of intra‐island speciation due to population divergence by topographical isolation or ecological heterogeneity has not yet been addressed. The aim of this study was to investigate intraspecific genetic structures and to identify spatial and ecological drivers of genetic population differentiation on the island scale. We analyzed inter simple sequence repeat variation within two island‐endemic Aeonium species of La Palma: one widespread generalist that covers a large variety of different habitat types (Ae. davidbramwellii) and one narrow ecological specialist (Ae. nobile), in order to assess evolutionary potentials on this island. Gene pool differentiation and genetic diversity patterns were associated with major landscape structures in both species, with phylogeographic implications. However, overall levels of genetic differentiation were low. For the generalist species, outlier loci detection and loci–environment correlation approaches indicated moderate signatures of divergent selection pressures linked to temperature and precipitation variables, while the specialist species missed such patterns. Our data point to incipient differentiation among populations, emphasizing that ecological heterogeneity and topographical structuring within the small scales of an island can foster evolutionary processes. Very likely, such processes have contributed to the radiation of Aeonium on the Canary Islands. There is also support for different evolutionary mechanisms between generalist and specialist species. |
format | Online Article Text |
id | pubmed-4667834 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-46678342015-12-10 Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width Harter, David E. V. Thiv, Mike Weig, Alfons Jentsch, Anke Beierkuhnlein, Carl Ecol Evol Original Research The Crassulacean genus Aeonium is a well‐known example for plant species radiation on oceanic archipelagos. However, while allopatric speciation among islands is documented for this genus, the role of intra‐island speciation due to population divergence by topographical isolation or ecological heterogeneity has not yet been addressed. The aim of this study was to investigate intraspecific genetic structures and to identify spatial and ecological drivers of genetic population differentiation on the island scale. We analyzed inter simple sequence repeat variation within two island‐endemic Aeonium species of La Palma: one widespread generalist that covers a large variety of different habitat types (Ae. davidbramwellii) and one narrow ecological specialist (Ae. nobile), in order to assess evolutionary potentials on this island. Gene pool differentiation and genetic diversity patterns were associated with major landscape structures in both species, with phylogeographic implications. However, overall levels of genetic differentiation were low. For the generalist species, outlier loci detection and loci–environment correlation approaches indicated moderate signatures of divergent selection pressures linked to temperature and precipitation variables, while the specialist species missed such patterns. Our data point to incipient differentiation among populations, emphasizing that ecological heterogeneity and topographical structuring within the small scales of an island can foster evolutionary processes. Very likely, such processes have contributed to the radiation of Aeonium on the Canary Islands. There is also support for different evolutionary mechanisms between generalist and specialist species. John Wiley and Sons Inc. 2015-09-14 /pmc/articles/PMC4667834/ /pubmed/26664682 http://dx.doi.org/10.1002/ece3.1682 Text en © 2015 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 Harter, David E. V. Thiv, Mike Weig, Alfons Jentsch, Anke Beierkuhnlein, Carl Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title | Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title_full | Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title_fullStr | Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title_full_unstemmed | Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title_short | Spatial and ecological population genetic structures within two island‐endemic Aeonium species of different niche width |
title_sort | spatial and ecological population genetic structures within two island‐endemic aeonium species of different niche width |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4667834/ https://www.ncbi.nlm.nih.gov/pubmed/26664682 http://dx.doi.org/10.1002/ece3.1682 |
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