Phylogeography of the Patagonian otter Lontra provocax: Adaptive divergence to marine habitat or signature of southern glacial refugia?

Juliana A. Vianna, Gonzalo Medina-Vogel, Claudio Chehébar, Walter Sielfeld, Carlos Olavarría, Sylvain Faugeron

Resultado de la investigación: Article

28 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Número de artículo53
PublicaciónBMC Evolutionary Biology
Volumen11
N.º1
DOI
EstadoPublished - 2 mar 2011

Huella dactilar

adaptive radiation
phylogeography
refugium
refuge habitats
divergence
habitat
habitats
river
haplotypes
rivers
Last Glacial Maximum
ice
Argentina
Chilo
fjord
ice cover
cytochrome
ice sheet
environmental change
cytochrome b

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Citar esto

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?. En: BMC Evolutionary Biology. 2011 ; Vol. 11, N.º 1.
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title = "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 the Chilo{\'e} 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 huill{\'i}n 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.",
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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.

En: BMC Evolutionary Biology, Vol. 11, N.º 1, 53, 02.03.2011.

Resultado de la investigación: Article

TY - JOUR

T1 - Phylogeography of the Patagonian otter Lontra provocax

T2 - Adaptive divergence to marine habitat or signature of southern glacial refugia?

AU - Vianna, Juliana A.

AU - Medina-Vogel, Gonzalo

AU - Chehébar, Claudio

AU - Sielfeld, Walter

AU - Olavarría, Carlos

AU - Faugeron, Sylvain

PY - 2011/3/2

Y1 - 2011/3/2

N2 - 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.

AB - 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.

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