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Abstract:

The Commerson's dolphin, Cephalorhynchus commersonii, is found in shallow waters of the continental shelf off the eastern coast of South America between 40°S and 56°S. This species is taken incidentally in artisanal gillnet fisheries, especially along the shallow coastline of northern Tierra del Fuego and southern Patagonia. The biological importance of by-catch is likely to be underestimated if the boundaries of subpopulations are not properly defined. Here, we report on the sequence variation of the mitochondrial DNA control region of the Commerson's dolphin from five areas defined in Tierra del Fuego, Argentina and Chile, to provide a preliminary assessment of population structure where conservation efforts are most needed. A 466 bp fragment of the mitochondrial DNA control region was sequenced from 196 samples of skin, teeth and bone, defining 20 haplotypes from 17 polymorphic sites. Nucleotide (π = 0.40%) and haplotype (h = 0.807) diversity were low compared to some other odontocete populations, but similar to that of other species of this genus. Genetic differentiation evaluated through analyses of molecular variance (AMOVA) showed significant overall differences among areas within Tierra del Fuego (Φ ST = 0.059, P < 0.01). An analysis of sex-specific population structure suggested that the dispersal rates of both females and males are low, indicative of females displaying greater site fidelity. The results from mtDNA control region sequences alone revealed significant differentiation among studied areas, which should be considered as independent management units. We recommend that the impact of localized gillnet mortalities should be managed on a local scale in these areas of Tierra del Fuego. © 2010 Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution
Autor:Pimper, L.E.; Baker, C.S.; Goodall, R.N.P.; Olavarría, C.; Remis, M.I.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160,Ciudad Universitaria, Buenos Aires, Argentina
Museo Acatushún de Aves y Mamíferos Marinos Australes (AMMA), Sarmiento 44, (9410) Ushuaia, Tierra del Fuego, Argentina
Centro Austral de Investigaciones Científicas (CADIC), Bernardo Houssay 200, (9410) Ushuaia, Tierra del Fuego, Argentina
School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
Marine Mammal Institute, Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, Newport, OR 97365, United States
Fundación Centro de Estudios del Cuaternario (CEQUA), Plaza Muñoz Gamero 1055, Punta Arenas, Chile
Palabras clave:Commerson's dolphin; Conservation genetics; mtDNA variation; Population structure; conservation genetics; continental shelf; dolphin; genetic analysis; genetic differentiation; gillnet; mitochondrial DNA; population structure; shallow water; spatial distribution; species conservation; Chile; Patagonia; Tierra del Fuego [(ARC) South America]; Cephalorhynchus commersonii
Año:2010
Volumen:11
Número:6
Página de inicio:2157
Página de fin:2168
DOI: http://dx.doi.org/10.1007/s10592-010-0102-z
Título revista:Conservation Genetics
Título revista abreviado:Conserv. Genet.
ISSN:15660621
CODEN:CGOEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15660621_v11_n6_p2157_Pimper

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Citas:

---------- APA ----------
Pimper, L.E., Baker, C.S., Goodall, R.N.P., Olavarría, C. & Remis, M.I. (2010) . Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution. Conservation Genetics, 11(6), 2157-2168.
http://dx.doi.org/10.1007/s10592-010-0102-z
---------- CHICAGO ----------
Pimper, L.E., Baker, C.S., Goodall, R.N.P., Olavarría, C., Remis, M.I. "Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution" . Conservation Genetics 11, no. 6 (2010) : 2157-2168.
http://dx.doi.org/10.1007/s10592-010-0102-z
---------- MLA ----------
Pimper, L.E., Baker, C.S., Goodall, R.N.P., Olavarría, C., Remis, M.I. "Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution" . Conservation Genetics, vol. 11, no. 6, 2010, pp. 2157-2168.
http://dx.doi.org/10.1007/s10592-010-0102-z
---------- VANCOUVER ----------
Pimper, L.E., Baker, C.S., Goodall, R.N.P., Olavarría, C., Remis, M.I. Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution. Conserv. Genet. 2010;11(6):2157-2168.
http://dx.doi.org/10.1007/s10592-010-0102-z