Mitochondrial DNA diversity of the Southwestern Atlantic humpback whale (Megaptera novaeangliae) breeding area off Brazil, and the potential connections to Antarctic feeding areas |
| |
Authors: | Márcia H Engel Nelson J R Fagundes Howard C Rosenbaum Matthew S Leslie Paulo H Ott Renata Schmitt Eduardo Secchi Luciano Dalla Rosa Sandro Luis Bonatto |
| |
Institution: | 1. Instituto Baleia Jubarte/Humpback Whale Institute, Rua Bar?o do Rio Branco 26, 45900-000, Caravelas, BA, Brazil 2. Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga 6681, 90619-900, Porto Alegre, RS, Brazil 3. The Wildlife Conservation Society, Cetacean Conservation and Research Program, International Conservation-Marine, 185th Street and Southern Blvd., Bronx, NY, 10460, USA 4. American Museum of Natural History, Sackler Institute for Comparative Genomics and Center for Biodiversity and Conservation, New York, NY, 10024, USA 5. Grupo de Estudos de Mamíferos Aquáticos do Rio Grande do Sul, Rua Felipe Neri 382/203, 90440-150, Porto Alegre, RS, Brazil 6. Projeto Baleias/Brazilian Antarctic Program, Rio Grande, RS, Brazil 7. Laboratório de Mamíferos Marinhos, Museu Oceanográfico “Prof. Eliézer C. Rios”, Funda??o Universidade Federal do Rio Grande, Cx.P.379, 96200-970, Rio Grande, RS, Brazil 8. Marine Mammal Research Unit, Fisheries Centre and Department of Zoology, University of British Columbia, Room 215, AERL, 2202, Main Mall, Vancouver, BC, Canada, V6T 1Z4
|
| |
Abstract: | In the Southwestern Atlantic Ocean, humpback whales migrate every winter to the Brazilian coast for breeding and calving in
the Abrolhos Bank. This breeding stock represents the remnants of a larger population heavily exploited during the beginning
of the 20th century. Despite its relevance to conservation efforts, the degree of current genetic variation and the migratory
relationship with Antarctic feeding areas for this population are still largely unknown. To examine these questions, we sequenced
∼400 bp of the mitochondrial DNA control region from samples taken off the Brazilian coast (n = 171) and near the Antarctic Peninsula (n = 77). The genetic variability of the Brazilian humpback whale breeding population was high and similar to that found in
other Southern Hemisphere breeding grounds. Phylogenetic analysis suggested the existence of a new mitochondrial clade that
exists at low frequency among Southern Hemisphere populations. Direct comparison between the Brazilian and the Colombia breeding
populations and the Antarctic Peninsula feeding population showed no genetic differentiation between this feeding region and
the Colombian breeding area or between feeding Areas I and II near the Antarctic Peninsula. In contrast, these populations
were genetically distinct from the Brazilian population. Two humpback whales sampled off South Georgia Islands, in the Scotia
Sea, shared identical haplotypes to whales from Brazil. Our results, supported by photo-identification and satellite telemetry
data, suggest that the main feeding area of the Southern Hemisphere humpback whale population is likely to be located near
the South Georgia/South Sandwich Islands area and not in the Antarctic Peninsula. |
| |
Keywords: | Humpback whale Mitochondrial DNA Abrolhos Bank Antarctic Peninsula Genetic diversity Megaptera novaeangliae |
本文献已被 SpringerLink 等数据库收录! |
|