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?

M. Mendez, Thomas Jefferson, Sergios-Orestis Kolokotronis, Michael Krützen, Guido Parra, Tim Collins, Giana Minton, Robert Baldwin, Per Berggren, Anna Särnblad, Omar Amir, Vic Peddemors, Leszek Karczmarski, Almeida Guissamulo, Brian Smith, Dipani Sutaria, George Amato, Howard Rosenbaum

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    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).

    Original languageEnglish
    Pages (from-to)5936-5948
    Number of pages13
    JournalMolecular Ecology
    Volume22
    Issue number23
    DOIs
    Publication statusPublished - Dec 2013

    Keywords

    • cetaceans
    • conservation genetics
    • humpback dolphins
    • mammals
    • molecular evolution
    • speciation

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