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Genetic population structure of grey mackerel Scomberomorus semifasciatus in northern Australia

Authors

  • D. Broderick,

    1. Molecular Fisheries Laboratory, Queensland Department of Employment, Economic Development and Innovation, P. O. Box 6097, St Lucia, 4069 Queensland, Australia
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  • J. R. Ovenden,

    Corresponding author
    1. Molecular Fisheries Laboratory, Queensland Department of Employment, Economic Development and Innovation, P. O. Box 6097, St Lucia, 4069 Queensland, Australia
      Tel.: +61 7 3346 6514; email: Jennifer.Ovenden@deedi.qld.gov.au
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  • R. C. Buckworth,

    1. Fisheries Research Laboratory, Department of Resources, G. P. O. Box 3000, Darwin, 0810 Northern Territory, Australia
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    • Present address: CSIRO Marine & Atmospheric Research, G. P. O. Box 2583, Brisbane, 4001 Queensland, Australia.

  • S. J. Newman,

    1. Western Australian Fisheries and Marine Research Laboratories, Department of Fisheries, Government of Western Australia, P. O. Box 20, North Beach, 6920 Western Australia, Australia
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  • R. J. G. Lester,

    1. Parasitology, SCMB, University of Queensland, Brisbane, 4072 Queensland, Australia
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  • D. J. Welch

    1. Fishing & Fisheries Research Centre, School of Earth and Environmental Sciences, James Cook University, Townsville, 4811 Queensland, Australia
    2. Queensland Department of Employment, Economic Development and Innovation, P. O. Box 1085, Oonoonba, 4811 Queensland, Australia
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Tel.: +61 7 3346 6514; email: Jennifer.Ovenden@deedi.qld.gov.au

Abstract

This study used mtDNA sequence and microsatellite markers to elucidate the population structure of Scomberomorus semifasciatus collected from 12 widespread sampling locations in Australia. Samples (n = 544) were genotyped with nine microsatellite loci, and 353 were sequenced for the control (384 bp) and ATPase (800 bp) mtDNA gene regions. Combined interpretation of microsatellite and mtDNA data identified four genetic stocks of S. semifasciatus: Western Australia, north-west coast of the Northern Territory, Gulf of Carpentaria and the eastern coast of Queensland. Connectivity among stocks across northern Australia from the Northern Territory to the eastern coast of Queensland was high (mean FST = 0·003 for the microsatellite data and ΦST = 0·033 and 0·009 for control region and ATPase, respectively) leading to some uncertainty about stock boundaries. In contrast, there was a clear genetic break between the stock in Western Australia compared to the rest of northern Australia (mean FST = 0·132 for the microsatellite data and ΦST = 0·135 and 0·188 for control region and ATPase, respectively). This indicates a restriction to gene flow possibly associated with suboptimal habitat along the Kimberley coast (north Western Australia). The appropriate scale of management for this species corresponds to the jurisdictions of the three Australian states, except that authorities in Queensland and Northern Territory should co-ordinate the management of the Gulf of Carpentaria stock.

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