Phylogeography of the copper shark (Carcharhinus brachyurus) in the southern hemisphere: implications for the conservation of a coastal apex predator

M Benavides, Kevin Feldheim, Clinton Duffy, Sabine Wintner, Mattias Braccini, Jessica Boomer, Charlie Huveneers, Paul Rogers, J Mangel, Joanna Alfaro-Shigueto, Dan Cartamil, Demian Chapman

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)

    Abstract

    The copper or bronze whaler shark (Carcharhinus brachyurus) is a large, coastal top predator that is vulnerable to overexploitation. We test the null hypothesis that copper sharks are panmictic throughout the southern hemisphere. We analysed part of the mitochondrial control region (mtCR) in 120 individuals from eight sampling areas, defining 20 mtCR haplotypes (h = 0.76 ± 0.06, π = 0.016 ± 0.0007). Significant genetic structure was detected among the following three major coastal regions separated by oceanic habitat: Australia-New Zealand, South Africa-Namibia and Per (AMOVA Φ ST=0. 95, P < 0.000001). A major phylogeographic discontinuity exists across the Indian Ocean, indicating an absence of at least female-mediated gene flow for ∼3 million years. We propose that this species originated in the Atlantic, experienced vicariant isolation of Pacific and Atlantic lineages by the rise of the Isthmus of Panama and, subsequently, dispersed across the Pacific to colonise Australasia. Oceanic expanses appear to be traversed over evolutionary but not ecological timescales, which means that regional copper-shark populations should be assessed and managed independently.

    Original languageEnglish
    Pages (from-to)861-869
    Number of pages9
    JournalMarine and Freshwater Research
    Volume62
    Issue number7
    DOIs
    Publication statusPublished - 2011

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