Status, population trend and genetic structure of South American fur seals, Arctocephalus australis, in southwestern Atlantic waters

Autor(es)

Crespo, Enrique A. ^{[1, 2]} ; Schiavini, Adrian C. M. ^[3] ; Garcia, Nestor A. ^[1] ; Franco-Trecu, Valentina ^[4] ; Goodall, R. Natalie P. ^[5] ; Rodriguez, Diego ^{[6, 7]} ; Morgante, Joao Stenghel ^[8] ; de Oliveira, Larissa Rosa ^{[9, 10]}

Afiliação do(s) autor(es)

^[1] Ctr Nacl Patagon CONICET, Lab Mamiferos Marinos, RA-9120 Puerto Madryn, Chubut - Argentina

^[2] Univ Nacl Patagonia, RA-9120 Puerto Madryn, Chubut - Argentina

^[3] Ctr Austral Invest Cient CONICET, RA-9410 Ushuaia, Tierra Fuego - Argentina

^[4] Proyecto Pinnipedos, Secc Etol, Fac Ciencias, Montevideo 11100 - Uruguay

^[5] Museo Acatushun Aves & Mamiferos Marinos Australe, Estancia Harberton, RA-9410 Ushuaia, Tierra Fuego - Argentina

^[6] Univ Nacl Mar del Plata, Inst Invest Marinas & Costeras, Fac Ciencias Exactas & Nat, RA-7600 Mar Del Plata, Buenos Aires - Argentina

^[7] Univ Nacl Mar del Plata, CONICET, RA-7600 Mar Del Plata, Buenos Aires - Argentina

^[8] Univ Sao Paulo, Lab Biol Evolut & Conservacao Vertebrados, BR-05508900 Sao Paulo - Brazil

^[9] Univ Vale Rio dos Sinos UNISINOS, Lab Ecol Mamiferos, BR-93022000 Sao Leopoldo, RS - Brazil

^[10] Grp Estudos Mamiferos Aquat Rio Grande do Sul GEM, BR-95520000 Osorio, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE MAMMAL SCIENCE; v. 31, n. 3, p. 866-890, JUL 2015.
• Citações Web of Science: 19

Resumo

The South American fur seal (SAFS), Arctocephalus australis, was severely depleted during the 18th century. This work updates information on distribution, abundance, seasonal movements, and genetic structure along the southwestern South Atlantic. Its distribution in Argentine waters includes nineteen rookeries on the Patagonian coast, Isla de los Estados, and islets of the Beagle Channel. Censuses were carried out in rookeries from Isla Escondida to Isla de los Estados from 1996 to 2014. The largest concentrations are found in Chubut, (4,500-15,500 seals) and Isla de los Estados (4,500). Pups were recorded on Isla Escondida, Rasa, and Isla de los Estados. An increasing number of SAFS were recorded in northern Patagonia, including seals marked in Uruguay. Skin samples were taken from southern Brazil to Tierra del Fuego in order to evaluate population structure and demographic trends. Genetic results indicated no population subdivisions (phi(st) = -0.0292, F-st = -0.00716, P>0.05). Bayesian skyline plots constructed for the entire data set indicated evidence of rapid population expansion discernible in Nef between the last 20,000 and 17,000yr. Genetics results and observation data from marked fur seals support the hypothesis of ancient gene flow and a single Atlantic population. Therefore, SAFS should be managed under international and integrated conservation policies. (AU)

• Processo FAPESP: 00/01340-0 - Variação geográfica em lobo-marinho sul-americano Arctocephalus australis (Carnivora : Otariidae): uma espécie ameaçada de extinção
• Beneficiário: João Stenghel Morgante
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 00/00248-2 - Analise da variacao geografica em cranios das populacoes do lobo-marinho sul-americano arctocephalus australis (zimmermann, 1783) (carnivora: otariidae).
• Beneficiário: Larissa Rosa de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado