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    Strong population structure deduced from genetics, otolith chemistry and parasite abundances explains vulnerability to localized fishery collapse in a large Sciaenid fish, Protonibea diacanthus

    Access Status
    Open access via publisher
    Authors
    Taillebois, L.
    Barton, D.
    Crook, D.
    Saunders, T.
    Taylor, J.
    Hearnden, M.
    Saunders, R.
    Newman, Stephen
    Travers, M.
    Welch, D.
    Greig, A.
    Dudgeon, C.
    Maher, S.
    Ovenden, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Taillebois, L. and Barton, D. and Crook, D. and Saunders, T. and Taylor, J. and Hearnden, M. and Saunders, R. et al. 2017. Strong population structure deduced from genetics, otolith chemistry and parasite abundances explains vulnerability to localized fishery collapse in a large Sciaenid fish, Protonibea diacanthus. Evolutionary Applications.
    Source Title
    Evolutionary Applications
    DOI
    10.1111/eva.12499
    ISSN
    1752-4563
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/56103
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 John Wiley & Sons Ltd. As pressure on coastal marine resources is increasing globally, the need to quantitatively assess vulnerable fish stocks is crucial in order to avoid the ecological consequences of stock depletions. Species of Sciaenidae (croakers, drums) are important components of tropical and temperate fisheries and are especially vulnerable to exploitation. The black-spotted croaker, Protonibea diacanthus, is the only large sciaenid in coastal waters of northern Australia where it is targeted by commercial, recreational and indigenous fishers due to its food value and predictable aggregating behaviour. Localized declines in the abundance of this species have been observed, highlighting the urgent requirement by managers for information on fine- and broad-scale population connectivity. This study examined the population structure of P. diacanthus across north-western Australia using three complementary methods: genetic variation in microsatellite markers, otolith elemental composition and parasite assemblage composition. The genetic analyses demonstrated that there were at least five genetically distinct populations across the study region, with gene flow most likely restricted by inshore biogeographic barriers such as the Dampier Peninsula. The otolith chemistry and parasite analyses also revealed strong spatial variation among locations within broad-scale regions, suggesting fine-scale location fidelity within the lifetimes of individual fish. The complementarity of the three techniques elucidated patterns of connectivity over a range of spatial and temporal scales. We conclude that fisheries stock assessments and management are required at fine scales (100 s of km) to account for the restricted exchange among populations (stocks) and to prevent localized extirpations of this species. Realistic management arrangements may involve the successive closure and opening of fishing areas to reduce fishing pressure.

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