Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia?
Abstract Background A number of studies have described the extension of ice cover in western Patagonia during the Last Glacial Maximum, providing evidence of a complete cover of terrestrial habitat from 41°S to 56°S and two main refugia, one in south-eastern Tierra del Fuego and the other north of t...
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ftbiomed:oai:biomedcentral.com:1471-2148-11-53 2023-05-15T16:41:11+02:00 Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? Vianna, Juliana A Medina-Vogel, Gonzalo Chehébar, Claudio Sielfeld, Walter Olavarría, Carlos Faugeron, Sylvain 2011-02-28 http://www.biomedcentral.com/1471-2148/11/53 en eng BioMed Central Ltd. http://www.biomedcentral.com/1471-2148/11/53 Copyright 2011 Vianna et al; licensee BioMed Central Ltd. Research article 2011 ftbiomed 2011-03-27T00:35:45Z Abstract Background A number of studies have described the extension of ice cover in western Patagonia during the Last Glacial Maximum, providing evidence of a complete cover of terrestrial habitat from 41°S to 56°S and two main refugia, one in south-eastern Tierra del Fuego and the other north of the Chiloé Island. However, recent evidence of high genetic diversity in Patagonian river species suggests the existence of aquatic refugia in this region. Here, we further test this hypothesis based on phylogeographic inferences from a semi-aquatic species that is a top predator of river and marine fauna, the huillín or Southern river otter ( Lontra provocax ). Results We examined mtDNA sequences of the control region, ND5 and Cytochrome-b (2151 bp in total) in 75 samples of L. provocax from 21 locations in river and marine habitats. Phylogenetic analysis illustrates two main divergent clades for L. provocax in continental freshwater habitat. A highly diverse clade was represented by haplotypes from the marine habitat of the Southern Fjords and Channels (SFC) region (43°38' to 53°08'S), whereas only one of these haplotypes was paraphyletic and associated with northern river haplotypes. Conclusions Our data support the hypothesis of the persistence of L. provocax in western Patagonia, south of the ice sheet limit, during last glacial maximum (41°S latitude). This limit also corresponds to a strong environmental change, which might have spurred L. provocax differentiation between the two environments. Article in Journal/Newspaper Ice Sheet Lontra Tierra del Fuego BioMed Central Chiloé ENVELOPE(-63.983,-63.983,-65.517,-65.517) Patagonia |
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BioMed Central |
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English |
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Abstract Background A number of studies have described the extension of ice cover in western Patagonia during the Last Glacial Maximum, providing evidence of a complete cover of terrestrial habitat from 41°S to 56°S and two main refugia, one in south-eastern Tierra del Fuego and the other north of the Chiloé Island. However, recent evidence of high genetic diversity in Patagonian river species suggests the existence of aquatic refugia in this region. Here, we further test this hypothesis based on phylogeographic inferences from a semi-aquatic species that is a top predator of river and marine fauna, the huillín or Southern river otter ( Lontra provocax ). Results We examined mtDNA sequences of the control region, ND5 and Cytochrome-b (2151 bp in total) in 75 samples of L. provocax from 21 locations in river and marine habitats. Phylogenetic analysis illustrates two main divergent clades for L. provocax in continental freshwater habitat. A highly diverse clade was represented by haplotypes from the marine habitat of the Southern Fjords and Channels (SFC) region (43°38' to 53°08'S), whereas only one of these haplotypes was paraphyletic and associated with northern river haplotypes. Conclusions Our data support the hypothesis of the persistence of L. provocax in western Patagonia, south of the ice sheet limit, during last glacial maximum (41°S latitude). This limit also corresponds to a strong environmental change, which might have spurred L. provocax differentiation between the two environments. |
format |
Article in Journal/Newspaper |
author |
Vianna, Juliana A Medina-Vogel, Gonzalo Chehébar, Claudio Sielfeld, Walter Olavarría, Carlos Faugeron, Sylvain |
spellingShingle |
Vianna, Juliana A Medina-Vogel, Gonzalo Chehébar, Claudio Sielfeld, Walter Olavarría, Carlos Faugeron, Sylvain Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
author_facet |
Vianna, Juliana A Medina-Vogel, Gonzalo Chehébar, Claudio Sielfeld, Walter Olavarría, Carlos Faugeron, Sylvain |
author_sort |
Vianna, Juliana A |
title |
Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
title_short |
Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
title_full |
Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
title_fullStr |
Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
title_full_unstemmed |
Phylogeography of the Patagonian otter Lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
title_sort |
phylogeography of the patagonian otter lontra provocax: adaptive divergence to marine habitat or signature of southern glacial refugia? |
publisher |
BioMed Central Ltd. |
publishDate |
2011 |
url |
http://www.biomedcentral.com/1471-2148/11/53 |
long_lat |
ENVELOPE(-63.983,-63.983,-65.517,-65.517) |
geographic |
Chiloé Patagonia |
geographic_facet |
Chiloé Patagonia |
genre |
Ice Sheet Lontra Tierra del Fuego |
genre_facet |
Ice Sheet Lontra Tierra del Fuego |
op_relation |
http://www.biomedcentral.com/1471-2148/11/53 |
op_rights |
Copyright 2011 Vianna et al; licensee BioMed Central Ltd. |
_version_ |
1766031616693501952 |