Integrating multiple lines of evidence to better understand the evolutionary divergence of humpback dolphins along their entire distribution range: a new dolphin species in Australian waters?

Mendez, Martin, Jefferson, Thomas, Kolokotronis, Sergios-Orestis, Krützen, Michael, Parra, Guido J., Collins, Tim, Minton, Giana, Baldwin, Robert, Berggren, Per, Särnblad, Anna, Amir, Omar A., Peddemors, Vic M., Karczmarski, Leszek, Guissamulo, Almeida, Smith, Brian, Sutaria, Dipani, Amato, George, and Rosenbaum, Howard C. (2013) Integrating multiple lines of evidence to better understand the evolutionary divergence of humpback dolphins along their entire distribution range: a new dolphin species in Australian waters? Molecular Ecology, 22 (23). pp. 5936-5948.

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Abstract

The conservation of humpback dolphins, distributed in coastal waters of the Indo-West Pacific and eastern Atlantic Oceans, has been hindered by a lack of understanding about the number of species in the genus (Sousa) and their population structure. To address this issue, we present a combined analysis of genetic and morphologic data collected from beach-cast, remote-biopsied and museum specimens from throughout the known Sousa range. We extracted genetic sequence data from 235 samples from extant populations and explored the mitochondrial control region and four nuclear introns through phylogenetic, population-level and population aggregation frameworks. In addition, 180 cranial specimens from the same geographical regions allowed comparisons of 24 morphological characters through multivariate analyses. The genetic and morphological data showed significant and concordant patterns of geographical segregation, which are typical for the kind of demographic isolation displayed by species units, across the Sousa genus distribution range. Based on our combined genetic and morphological analyses, there is convincing evidence for at least four species within the genus (S.teuszii in the Atlantic off West Africa, S.plumbea in the central and western Indian Ocean, S.chinensis in the eastern Indian and West Pacific Oceans, and a new as-yet-unnamed species off northern Australia).

Item ID: 31725
Item Type: Article (Research - C1)
ISSN: 0962-1083
Keywords: conservation genetics, mammals, molecular evolution, speciation, humpback dolphins, cetaceans
Funders: Ocean Park Conservation Foundation Hong Kong, Agriculture, Fisheries and Conservation Department of the Hong Kong Government
Date Deposited: 26 Feb 2014 09:51
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050202 Conservation and Biodiversity @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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