High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis
Knowledge about current patterns of genetic structure of populations together with the evolutionary history of a species helps to understand and predict the adaptation of populations to future climate change. We assayed variation at nuclear microsatellite markers among peripheral vs. continuous populations of the temperate South American species Austrocedrus chilensis, to investigate the role of historical vs. demographical forces in shaping population genetic structure. This species occurs in continuous populations in the west and central distribution range, but becomes highly fragmented at the eastern limit, which comprised ice-free areas during Quaternary glaciations and has extreme climatic conditions at present times. Bayesian analysis methods identified two contrasting patterns of genetic structure; (I) populations from humid, mesic and peri-glacial regions formed a single deme with relatively low genetic differentiation and high admixture levels whereas (II) a highly heterogeneous genetic structure with low level of admixture was found in the steppe, towards the east and northeast limit of the distribution range. In the steppe, population fragmentation, restricted gene flow and isolation-by-distance were also inferred. In addition, several small steppe populations showed high genetic diversity and divergent gene pools, suggesting that they constitute ancient refuges from pre-Holocene glaciations with just a subgroup of them contributing significantly to post-glacial spread. These results are discussed in relation to patterns of genetic variation found for other temperate species and the contribution of the particular southern Andes topography and climate to post-glacial spread.
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Formato: | info:ar-repo/semantics/artículo biblioteca |
Idioma: | eng |
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Elsevier
2010-03
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Assuntos: | Austrocedrus, Diversidad Genética (como recurso), Adaptación al Cambio Climático, Genetic Diversity (as resource), Climate Change Adaptation, Austrocedrus Chilensis, Región Patagónica, |
Acesso em linha: | http://hdl.handle.net/20.500.12123/7528 https://www.sciencedirect.com/science/article/abs/pii/S1055790309004540 https://doi.org/10.1016/j.ympev.2009.11.007 |
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oai:localhost:20.500.12123-75282020-07-07T17:04:16Z High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis Arana, María Veronica Gallo, Leonardo Ariel Vendramin, Giovanni Giuseppe Pastorino, Mario Juan Sebastiani, Federico Marchelli, Paula Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica Knowledge about current patterns of genetic structure of populations together with the evolutionary history of a species helps to understand and predict the adaptation of populations to future climate change. We assayed variation at nuclear microsatellite markers among peripheral vs. continuous populations of the temperate South American species Austrocedrus chilensis, to investigate the role of historical vs. demographical forces in shaping population genetic structure. This species occurs in continuous populations in the west and central distribution range, but becomes highly fragmented at the eastern limit, which comprised ice-free areas during Quaternary glaciations and has extreme climatic conditions at present times. Bayesian analysis methods identified two contrasting patterns of genetic structure; (I) populations from humid, mesic and peri-glacial regions formed a single deme with relatively low genetic differentiation and high admixture levels whereas (II) a highly heterogeneous genetic structure with low level of admixture was found in the steppe, towards the east and northeast limit of the distribution range. In the steppe, population fragmentation, restricted gene flow and isolation-by-distance were also inferred. In addition, several small steppe populations showed high genetic diversity and divergent gene pools, suggesting that they constitute ancient refuges from pre-Holocene glaciations with just a subgroup of them contributing significantly to post-glacial spread. These results are discussed in relation to patterns of genetic variation found for other temperate species and the contribution of the particular southern Andes topography and climate to post-glacial spread. Estación Experimental Agropecuaria Bariloche Fil: Arana, María Veronica. Intituto Nacional de Tecnologia Agropecuaria (INTA). Estacion Experimental Agropecuaria Bariloche. Área Recursos Forestales. Unidad de Genética Ecológica y Mejoramiento Forestal; Argentina Fil: Gallo, Leonardo Ariel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Área de Recursos Forestales. Unidad de Genética Ecológica y Mejoramiento Forestal; Argentina Fil: Vendramin, Giovanni Giuseppe. National Research Council of Italy. Institute of Biosciences and Bioresources. Division of Florence; Italia Fil: Pastorino, Mario Juan. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Consejo Nacional de Investigaciones Cientıicas y Tecnicas; Argentina Fil: Sebastiani, Federico. National Research Council of Italy. Institute of Biosciences and Bioresources. Division of Florence; Italia Fil: Marchelli, Paula. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Consejo Nacional de Investigaciones Cientıicas y Tecnicas; Argentina 2020-07-07T16:53:20Z 2020-07-07T16:53:20Z 2010-03 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/7528 https://www.sciencedirect.com/science/article/abs/pii/S1055790309004540 1055-7903 https://doi.org/10.1016/j.ympev.2009.11.007 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier Molecular Phylogenetics and Evolution 54 (3) : 941-949 (Marzo 2010) |
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Biblioteca Central del INTA Argentina |
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topic |
Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica |
spellingShingle |
Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica Arana, María Veronica Gallo, Leonardo Ariel Vendramin, Giovanni Giuseppe Pastorino, Mario Juan Sebastiani, Federico Marchelli, Paula High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
description |
Knowledge about current patterns of genetic structure of populations together with the evolutionary history of a species helps to understand and predict the adaptation of populations to future climate change. We assayed variation at nuclear microsatellite markers among peripheral vs. continuous populations of the temperate South American species Austrocedrus chilensis, to investigate the role of historical vs. demographical forces in shaping population genetic structure. This species occurs in continuous populations in
the west and central distribution range, but becomes highly fragmented at the eastern limit, which comprised ice-free areas during Quaternary glaciations and has extreme climatic conditions at present times. Bayesian analysis methods identified two contrasting patterns of genetic structure; (I) populations from humid, mesic and peri-glacial regions formed a single deme with relatively low genetic differentiation and high admixture levels whereas (II) a highly heterogeneous genetic structure with low level of admixture
was found in the steppe, towards the east and northeast limit of the distribution range. In the steppe, population fragmentation, restricted gene flow and isolation-by-distance were also inferred. In addition, several small steppe populations showed high genetic diversity and divergent gene pools, suggesting that they constitute ancient refuges from pre-Holocene glaciations with just a subgroup of them contributing significantly to post-glacial spread. These results are discussed in relation to patterns of genetic variation
found for other temperate species and the contribution of the particular southern Andes topography and climate to post-glacial spread. |
format |
info:ar-repo/semantics/artículo |
topic_facet |
Austrocedrus Diversidad Genética (como recurso) Adaptación al Cambio Climático Genetic Diversity (as resource) Climate Change Adaptation Austrocedrus Chilensis Región Patagónica |
author |
Arana, María Veronica Gallo, Leonardo Ariel Vendramin, Giovanni Giuseppe Pastorino, Mario Juan Sebastiani, Federico Marchelli, Paula |
author_facet |
Arana, María Veronica Gallo, Leonardo Ariel Vendramin, Giovanni Giuseppe Pastorino, Mario Juan Sebastiani, Federico Marchelli, Paula |
author_sort |
Arana, María Veronica |
title |
High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
title_short |
High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
title_full |
High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
title_fullStr |
High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
title_full_unstemmed |
High genetic variation in marginal fragmented populations at extreme climatic conditions of the Patagonian Cypress Austrocedrus chilensis |
title_sort |
high genetic variation in marginal fragmented populations at extreme climatic conditions of the patagonian cypress austrocedrus chilensis |
publisher |
Elsevier |
publishDate |
2010-03 |
url |
http://hdl.handle.net/20.500.12123/7528 https://www.sciencedirect.com/science/article/abs/pii/S1055790309004540 https://doi.org/10.1016/j.ympev.2009.11.007 |
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