Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)

Ctenomys (tuco-tuco) is the most numerous genus of South American subterranean rodents and one of the most genetically diverse clades of mammals known. In particular, the genus constitutes a very interesting model for evolutionary studies of genetic divergence and conservation. Ctenomys magellanicus...

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Autores principales: Fasanella, Mariana, Bruno, María Cecilia, Cardoso, Yamila Paula, Lizarralde, Marta Susana
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Naturales
Conservation
Demography
Genetic
Molecular markers
Population
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85642
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85642
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Conservation
Demography
Genetic
Molecular markers
Population
spellingShingle Ciencias Naturales
Conservation
Demography
Genetic
Molecular markers
Population
Fasanella, Mariana
Bruno, María Cecilia
Cardoso, Yamila Paula
Lizarralde, Marta Susana
Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
topic_facet Ciencias Naturales
Conservation
Demography
Genetic
Molecular markers
Population
description Ctenomys (tuco-tuco) is the most numerous genus of South American subterranean rodents and one of the most genetically diverse clades of mammals known. In particular, the genus constitutes a very interesting model for evolutionary studies of genetic divergence and conservation. Ctenomys magellanicus is the southernmost species of the group and the only one living in Isla Grande de Tierra del Fuego (Argentina). This species presents two chromosomal forms (Cm34 and Cm36) fragmented into demes distributed from the north region (steppe) to the south region (ecotone) of the island, respectively; no hybrids or overlapping areas were detected. To study the historical demography and the spatial genetic structure of the C.magellanicus population we used mitochondrial DNA (mtDNA) (D-loop and cytochrome b) and microsatellite loci. Nine mtDNA haplotypes were identified, three of them belonging to the north and the other six to the south. Shared haplotypes between regions were not detected. mtDNA and microsatellite genotypes showed a marked pattern of population structure with low values of genetic flow between regions. The south is made up of small populations or isolated demes making up an endogamic metapopulation with unique alleles and haplotypes. Also, the results suggest a northward expansion process starting from an ancestral haplotype from the south. That population might have lived at a refuge through the adverse Pleistocene environmental conditions that took place at Tierra del Fuego. Results of this study are relevant to the conservation of C.magellanicus, suggesting that each region (north and south) might be considered as an Evolutionarily Significant Unit.
format Articulo
Articulo
author Fasanella, Mariana
Bruno, María Cecilia
Cardoso, Yamila Paula
Lizarralde, Marta Susana
author_facet Fasanella, Mariana
Bruno, María Cecilia
Cardoso, Yamila Paula
Lizarralde, Marta Susana
author_sort Fasanella, Mariana
title Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
title_short Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
title_full Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
title_fullStr Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
title_full_unstemmed Historical demography and spatial genetic structure of the subterranean rodent <i>Ctenomys magellanicus</i> in Tierra del Fuego (Argentina)
title_sort historical demography and spatial genetic structure of the subterranean rodent <i>ctenomys magellanicus</i> in tierra del fuego (argentina)
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85642
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