Global diversity and oceanic divergence of humpback whales (Megaptera novaeangliae)

Jackson, Jennifer A., Steel, Debbie J., Beerli, P., Congdon, Bradley C., Olavarría, Carlos, Leslie, Matthew S., Pomilla, Cristina, Rosenbaum, Howard, and Baker, C. Scott (2014) Global diversity and oceanic divergence of humpback whales (Megaptera novaeangliae). Proceedings of the Royal Society of London Series B, Biological Sciences, 281 (1786). 20133222. pp. 1-10.

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Abstract

Humpback whales (Megaptera novaeangliae) annually undertake the longest migrations between seasonal feeding and breeding grounds of any mammal. Despite this dispersal potential, discontinuous seasonal distributions and migratory patterns suggest that humpbacks form discrete regional populations within each ocean. To better understand the worldwide population history of humpbacks, and the interplay of this species with the oceanic environment through geological time, we assembled mitochondrial DNA control region sequences representing approximately 2700 individuals (465 bp, 219 haplotypes) and eight nuclear intronic sequences representing approximately 70 individuals (3700 bp, 140 alleles) from the North Pacific, North Atlantic and Southern Hemisphere. Bayesian divergence time reconstructions date the origin of humpback mtDNA lineages to the Pleistocene (880 ka, 95% posterior intervals 550–1320 ka) and estimate radiation of current Northern Hemisphere lineages between 50 and 200 ka, indicating colonization of the northern oceans prior to the Last Glacial Maximum. Coalescent analyses reveal restricted gene flow between ocean basins, with long-term migration rates (individual migrants per generation) of less than 3.3 for mtDNA and less than 2 for nuclear genomic DNA. Genetic evidence suggests that humpbacks in the North Pacific, North Atlantic and Southern Hemisphere are on independent evolutionary trajectories, supporting taxonomic revision of M. novaeangliae to three subspecies.

Item ID: 32706
Item Type: Article (Research - C1)
ISSN: 1471-2954
Keywords: diversity, gene flow, genomic, mitochondrial, whale, cetacean
Funders: New Zealand Royal Society (NZRS), Lenfest Ocean Foundation (LOF), US National Science Foundation (NSF)
Projects and Grants: NZRS Marsden grant no. 01-UOA-070, LOF award no. 2004-001492-023, NSF grant no. DEB-1145999
Date Deposited: 04 Jun 2014 02:13
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 50%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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