Phylogeography of the Australian freshwater turtle Chelodina expansa reveals complex relationships among inland and coastal bioregions

Stephen Donnellan, Arthur GEORGES

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    We examined range-wide mitochondrial phylogeographical structure in the riverine freshwater turtle Chelodina expansa to determine whether this species exhibits deep genetic divergence between coastal and inland hydrological provinces, as seen in co-distributed freshwater taxa. We sequenced two mitochondrial loci, genealogical relationships were assessed using a network approach, and relationships among biogeographical regions were tested using analyses of molecular variance. Population history was evaluated using neutrality tests, indices of demographic expansion, and mismatch analyses. Twenty-one haplotypes were recovered across two mitochondrial haplogroups separated by approximately 4% nucleotide divergence. The haplogroups have discrete geographical boundaries but only partially support a hypothesis of deep divergence between coastal and inland bioregions. The first haplogroup comprises populations from the inland Murray-Darling Basin and from coastal catchments south of the Mary River in south-east Queensland. The second haplogroup comprises populations from coastal catchments north of the Mary River. Cryptic phylogeographical barriers separating adjacent coastal populations are congruent with those demonstrated for other freshwater taxa and may result from the combined influences of the Conondale Range and alluvial deposits at the mouth of the Mary River. The findings of the present study demonstrate that freshwater taxa commonly display genetic differentiation within a biogeographical region where no boundaries have been recognized, highlighting the need to uncover cryptic microbiogeographical regions to aid conservation of freshwater biota.
    Original languageEnglish
    Pages (from-to)789-805
    Number of pages17
    JournalBiological Journal of the Linnean Society
    Volume111
    Issue number4
    DOIs
    Publication statusPublished - 2014

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    phylogeography
    turtle
    turtles
    biogeographical region
    divergence
    rivers
    river
    catchment
    genetic variation
    alluvium
    genetic differentiation
    alluvial deposit
    Queensland
    biota
    mouth
    haplotypes
    demographic statistics
    nucleotides
    Chelodina
    basins

    Cite this

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    title = "Phylogeography of the Australian freshwater turtle Chelodina expansa reveals complex relationships among inland and coastal bioregions",
    abstract = "We examined range-wide mitochondrial phylogeographical structure in the riverine freshwater turtle Chelodina expansa to determine whether this species exhibits deep genetic divergence between coastal and inland hydrological provinces, as seen in co-distributed freshwater taxa. We sequenced two mitochondrial loci, genealogical relationships were assessed using a network approach, and relationships among biogeographical regions were tested using analyses of molecular variance. Population history was evaluated using neutrality tests, indices of demographic expansion, and mismatch analyses. Twenty-one haplotypes were recovered across two mitochondrial haplogroups separated by approximately 4{\%} nucleotide divergence. The haplogroups have discrete geographical boundaries but only partially support a hypothesis of deep divergence between coastal and inland bioregions. The first haplogroup comprises populations from the inland Murray-Darling Basin and from coastal catchments south of the Mary River in south-east Queensland. The second haplogroup comprises populations from coastal catchments north of the Mary River. Cryptic phylogeographical barriers separating adjacent coastal populations are congruent with those demonstrated for other freshwater taxa and may result from the combined influences of the Conondale Range and alluvial deposits at the mouth of the Mary River. The findings of the present study demonstrate that freshwater taxa commonly display genetic differentiation within a biogeographical region where no boundaries have been recognized, highlighting the need to uncover cryptic microbiogeographical regions to aid conservation of freshwater biota.",
    keywords = "Chelidae, Fraser Island, Mary River, mitochondrial DNA, Murray-Darling Basin, Pleistocene.",
    author = "Stephen Donnellan and Arthur GEORGES",
    year = "2014",
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    language = "English",
    volume = "111",
    pages = "789--805",
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    TY - JOUR

    T1 - Phylogeography of the Australian freshwater turtle Chelodina expansa reveals complex relationships among inland and coastal bioregions

    AU - Donnellan, Stephen

    AU - GEORGES, Arthur

    PY - 2014

    Y1 - 2014

    N2 - We examined range-wide mitochondrial phylogeographical structure in the riverine freshwater turtle Chelodina expansa to determine whether this species exhibits deep genetic divergence between coastal and inland hydrological provinces, as seen in co-distributed freshwater taxa. We sequenced two mitochondrial loci, genealogical relationships were assessed using a network approach, and relationships among biogeographical regions were tested using analyses of molecular variance. Population history was evaluated using neutrality tests, indices of demographic expansion, and mismatch analyses. Twenty-one haplotypes were recovered across two mitochondrial haplogroups separated by approximately 4% nucleotide divergence. The haplogroups have discrete geographical boundaries but only partially support a hypothesis of deep divergence between coastal and inland bioregions. The first haplogroup comprises populations from the inland Murray-Darling Basin and from coastal catchments south of the Mary River in south-east Queensland. The second haplogroup comprises populations from coastal catchments north of the Mary River. Cryptic phylogeographical barriers separating adjacent coastal populations are congruent with those demonstrated for other freshwater taxa and may result from the combined influences of the Conondale Range and alluvial deposits at the mouth of the Mary River. The findings of the present study demonstrate that freshwater taxa commonly display genetic differentiation within a biogeographical region where no boundaries have been recognized, highlighting the need to uncover cryptic microbiogeographical regions to aid conservation of freshwater biota.

    AB - We examined range-wide mitochondrial phylogeographical structure in the riverine freshwater turtle Chelodina expansa to determine whether this species exhibits deep genetic divergence between coastal and inland hydrological provinces, as seen in co-distributed freshwater taxa. We sequenced two mitochondrial loci, genealogical relationships were assessed using a network approach, and relationships among biogeographical regions were tested using analyses of molecular variance. Population history was evaluated using neutrality tests, indices of demographic expansion, and mismatch analyses. Twenty-one haplotypes were recovered across two mitochondrial haplogroups separated by approximately 4% nucleotide divergence. The haplogroups have discrete geographical boundaries but only partially support a hypothesis of deep divergence between coastal and inland bioregions. The first haplogroup comprises populations from the inland Murray-Darling Basin and from coastal catchments south of the Mary River in south-east Queensland. The second haplogroup comprises populations from coastal catchments north of the Mary River. Cryptic phylogeographical barriers separating adjacent coastal populations are congruent with those demonstrated for other freshwater taxa and may result from the combined influences of the Conondale Range and alluvial deposits at the mouth of the Mary River. The findings of the present study demonstrate that freshwater taxa commonly display genetic differentiation within a biogeographical region where no boundaries have been recognized, highlighting the need to uncover cryptic microbiogeographical regions to aid conservation of freshwater biota.

    KW - Chelidae

    KW - Fraser Island

    KW - Mary River

    KW - mitochondrial DNA

    KW - Murray-Darling Basin

    KW - Pleistocene.

    U2 - 10.1111/bij.12221

    DO - 10.1111/bij.12221

    M3 - Article

    VL - 111

    SP - 789

    EP - 805

    JO - Biological Journal of the Linnean Society

    JF - Biological Journal of the Linnean Society

    SN - 0024-4066

    IS - 4

    ER -