Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution
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 de...
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| 030 | |a CGOEA | ||
| 100 | 1 | |a Pimper, L.E. | |
| 245 | 1 | 0 | |a Mitochondrial DNA variation and population structure of Commerson's dolphins (Cephalorhynchus commersonii) in their southernmost distribution |
| 260 | |c 2010 | ||
| 270 | 1 | 0 | |m Pimper, L. E.; Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Buenos Aires, Argentina; email: liditas@ege.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a 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. |l eng | |
| 536 | |a Detalles de la financiación: National Geographic Society | ||
| 536 | |a Detalles de la financiación: Rufford Foundation | ||
| 536 | |a Detalles de la financiación: American Society of Mammalogists | ||
| 536 | |a Detalles de la financiación: Royal Society of New Zealand | ||
| 536 | |a Detalles de la financiación: Society for Marine Mammalogy | ||
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires, Aires/X-186 | ||
| 536 | |a Detalles de la financiación: BHF Centre of Research Excellence, Oxford | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: Cetacean Society International | ||
| 536 | |a Detalles de la financiación: American Museum of Natural History | ||
| 536 | |a Detalles de la financiación: Acknowledgements We are grateful to Debbie Steel, Merel Dalebout, Murdoch Vant, Susana Caballero for technical laboratory assistance, Gabriela de Tezanos Pinto for statistical advice, and Rebecca Hamner and 2 anonymous reviewers for helpful comments on a previous version of this paper. We also thank Franz Pichler for advice at various stages of this project. Funding for laboratory analysis in New Zealand was provided by a grant to CSB from the Marsden Fund of the New Zealand Royal Society. Funding for travel to and accommodation for LEP in New Zealand was provided by Cetacean Society International, Latin American Student Field Research Awards (American Society of Mammalogists), Lerner-Gray Fund for Marine research (American Museum of Natural History) and Society for Marine Mammalogy. Funding in Argentina and Chile for laboratory analysis and sampling was provided by a grant to LEP from The Rufford Small Grants Foundation, Marianne and Benno Lüthi Foundation, and Universidad de Buenos Aires/X-186 to MIR. LEP was also supported by a PhD grant from the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) of Argentina. Bone and teeth samples were exported under CITES permit 26714, extended by Ministerio de Salud y Ambiente—Secretaria de Ambi-ente y Desarrollo Sustentable, Buenos Aires, Argentina. We thank Jorge Acevedo and Anelio Aguayo for assisting in the collection of biopsy samples in Chile and the Fundación CEQUA for funding of fieldwork in Chile. This work was undertaken under the Scientific and Academic Collaboration Agreement between Fundación CEQUA and Fundación R. Natalie P. Goodall. RNP is extremely grateful to the many students and volunteers who helped revise beaches, collect, study and clean specimens over a 35-year period. Principal among them were I. Cameron, P. Laura, A. Galeazzi, A.P. Sobral, K. Laubscher, S. Macnie, C.C. Boy. The fieldwork has been mainly sponsored by grants from CRE, National Geographic Society. Since 1999–2000, necropsies, cleaning and storage have been carried out by university-level interns at the Museo Acatushún de Aves y Mamíferos Marinos Australes at Estancia Harberton, a building mainly financed by Total Austral S.A., Propak Systems Argentina S.A. and La Fondàtion D’Enterprise Total de Francia. Fuegian estancias, principally Harberton, San Martín, Cullen, Viamonte, Rodeo, Pirinaica and Sara, have always kindly assisted with logistics and hospitality on our expeditions. | ||
| 593 | |a Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160,Ciudad Universitaria, Buenos Aires, Argentina | ||
| 593 | |a Museo Acatushún de Aves y Mamíferos Marinos Australes (AMMA), Sarmiento 44, (9410) Ushuaia, Tierra del Fuego, Argentina | ||
| 593 | |a Centro Austral de Investigaciones Científicas (CADIC), Bernardo Houssay 200, (9410) Ushuaia, Tierra del Fuego, Argentina | ||
| 593 | |a School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand | ||
| 593 | |a Marine Mammal Institute, Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, Newport, OR 97365, United States | ||
| 593 | |a Fundación Centro de Estudios del Cuaternario (CEQUA), Plaza Muñoz Gamero 1055, Punta Arenas, Chile | ||
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| 690 | 1 | 0 | |a CONSERVATION GENETICS |
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| 651 | 4 | |a CHILE | |
| 651 | 4 | |a TIERRA DEL FUEGO [(ARC) SOUTH AMERICA] | |
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| 700 | 1 | |a Olavarría, C. | |
| 700 | 1 | |a Remis, M.I. | |
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