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    Oceanic and coastal populations of a harvested macroinvertebrate Rochia nilotica in north-western Australia are isolated and may be locally adapted

    Access Status
    Fulltext not available
    Authors
    Berry, O.
    Richards, Zoe
    Moore, G.
    Hernawan, U.
    Travers, M.
    Gruber, B.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Berry, O. and Richards, Z. and Moore, G. and Hernawan, U. and Travers, M. and Gruber, B. 2019. Oceanic and coastal populations of a harvested macroinvertebrate Rochia nilotica in north-western Australia are isolated and may be locally adapted. Marine and Freshwater Research.
    Source Title
    Marine and Freshwater Research
    DOI
    10.1071/MF19172
    ISSN
    1323-1650
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/76658
    Collection
    • Curtin Research Publications
    Abstract

    Marine macroinvertebrates support important fisheries throughout the Indo-Pacific, but stocks of species such as trochus (Rochia nilotica) are easily overharvested. In north-western Australia, trochus are taken from inshore reefs by Indigenous Australians and oceanic reefs by artisanal Indonesian fishers. The management of these environmentally distinct regions relies on understanding their spatial interdependencies, yet connectivity between them has not been evaluated empirically. Here, we used genotype-by-sequencing analysis of 514 trochus samples collected from 17 locations (15 in the inshore Kimberley, 2 offshore oceanic sites). Analysis of 5428 polymorphic single nucleotide polymorphism loci revealed significant genetic subdivision between the oceanic and coastal sites, and a subset of loci exhibited significantly higher subdivision, suggesting they are subject to directional selection. Population differentiation was also evident between the two oceanic sites, but not between coastal sites. Trochus populations from the coastal Kimberley and oceanic reefs represent two genetically and demographically independent units, with preliminary evidence for local adaptation to these distinctive environments. Management strategies for R. nilotica reflect these divisions, but the limited connectivity among oceanic populations indicates that they are vulnerable to overexploitation. Furthermore, their potential adaptive distinctiveness indicates that coastal stocks may be unsuitable for replenishing oceanic stocks.

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