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    Recent Diversification of a Marine Genus (Tursiops spp.) Tracks Habitat Preference and Environmental Change

    Access Status
    Fulltext not available
    Authors
    Moura, A.
    Nielsen, S.
    Vilstrup, J.
    Moreno-Mayar, V.
    Gilbert, Thomas
    Gray, H.
    Natoli, A.
    Moller, L.
    Rus Hoelzel, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Moura, A. and Nielsen, S. and Vilstrup, J. and Moreno-Mayar, V. and Gilbert, T. and Gray, H. and Natoli, A. et al. 2013. Recent Diversification of a Marine Genus (Tursiops spp.) Tracks Habitat Preference and Environmental Change. Systematic Biology. 62 (6): pp. 865-877.
    Source Title
    Systematic Biology
    Additional URLs
    http://sysbio.oxfordjournals.org/content/62/6/865.short
    ISSN
    1063-5157
    URI
    http://hdl.handle.net/20.500.11937/19798
    Collection
    • Curtin Research Publications
    Abstract

    Understanding the evolution of diversity and the resulting systematics in marine systems is confounded by the lack of clear boundaries in oceanic habitats, especially for highly mobile species like marine mammals. Dolphin populations and sibling species often show differentiation between coastal and offshore habitats, similar to the pelagic/littoral or benthic differentiation seen for some species of fish. Here we test the hypothesis that lineages within the polytypic genus Tursiops track past changes in the environment reflecting ecological drivers of evolution facilitated by habitat release. We used a known recent time point for calibration (the opening of the Bosphorus) and whole mitochondrial genome (mitogenome) sequences for high phylogenetic resolution. The pattern of lineage formation suggested an origin in Australasia and several early divisions involving forms currently inhabiting coastal habitats. Radiation in pelagic environments was relatively recent, and was likely followed by a return to coastal habitat in some regions. The timing of some nodes defining different ecotypes within the genus clustered near the two most recent interglacial transitions. A signal for an increase in diversification was also seen for dates after the last glacial maximum. Together these data suggest the tracking of habitat preference during geographic expansions, followed by transition points reflecting habitat shifts, which were likely associated with periods of environmental change. [Climatic oscillations; marine mammal; pleistocene; radiation; speciation.]

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