Dispersal in the desert: Ephemeral water drives connectivity and phylogeography of an arid-adapted fish

K Mossop, Mark Adams, Peter UNMACK, K Smith Date, Bob Wong, David Chapple

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Aim: We examine landscape processes shaping the range-wide phylogeography of a dispersal-limited, desert-dwelling fish (the desert goby, Chlamydogobius eremius) in arid Australia. Location: South-western Lake Eyre Basin, central Australia. Methods: We obtained sequence data for the mitochondrial cytochrome b gene (n = 513 individuals) and nuclear genetic markers (51 allozyme loci; n = 128 individuals) to investigate the phylogeographic relationships among 51 populations. Sampling spanned multiple habitat types (permanent desert springs, ephemeral rivers) and sub-catchments, and the entire distribution of C. eremius and representatives of its sister species, Chlamydogobius japalpa. Phylogeographic analyses (genetic diversity, AMOVA, Tajima's D, WST, mismatch distribution) were used to explore the distribution and partitioning of mtDNA variation; principal coordinates analysis and neighbour-joining tree networks were used to explore allozyme variation. Results: Three main genetic groups exist across C. eremius/C. japalpa populations. The geographical distributions of these groups reflected the historical and current confluence point of major rivers in the region. Surprisingly, permanent desert springs did not contain higher genetic diversity than ephemeral rivers. Main conclusions: Genetic structuring of Chlamydogobius populations revealed unanticipated levels of connectivity, indicating that the ephemeral waters of Lake Eyre have allowed gene flow across drainage boundaries and large distances. Phylogeographic breaks reveal that connectivity relies on temporary surface water, while rapid temporal changes in diversity highlight flood-driven dispersal as the main means of gene flow between localities and habitats. Dispersal pathways reveal that ecological context (life history and tolerance of extreme conditions) has played a key role in shaping observed patterns.
    Original languageEnglish
    Pages (from-to)2374-2388
    Number of pages15
    JournalJournal of Biogeography
    Volume42
    Issue number12
    DOIs
    Publication statusPublished - 2015

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    phylogeography
    connectivity
    deserts
    desert
    fish
    allozyme
    allozymes
    rivers
    gene flow
    water
    river
    genetic variation
    genetic marker
    confluence
    habitats
    cytochrome b
    habitat type
    geographical distribution
    cytochrome
    surface water

    Cite this

    Mossop, K ; Adams, Mark ; UNMACK, Peter ; Smith Date, K ; Wong, Bob ; Chapple, David. / Dispersal in the desert: Ephemeral water drives connectivity and phylogeography of an arid-adapted fish. In: Journal of Biogeography. 2015 ; Vol. 42, No. 12. pp. 2374-2388.
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    title = "Dispersal in the desert: Ephemeral water drives connectivity and phylogeography of an arid-adapted fish",
    abstract = "Aim: We examine landscape processes shaping the range-wide phylogeography of a dispersal-limited, desert-dwelling fish (the desert goby, Chlamydogobius eremius) in arid Australia. Location: South-western Lake Eyre Basin, central Australia. Methods: We obtained sequence data for the mitochondrial cytochrome b gene (n = 513 individuals) and nuclear genetic markers (51 allozyme loci; n = 128 individuals) to investigate the phylogeographic relationships among 51 populations. Sampling spanned multiple habitat types (permanent desert springs, ephemeral rivers) and sub-catchments, and the entire distribution of C. eremius and representatives of its sister species, Chlamydogobius japalpa. Phylogeographic analyses (genetic diversity, AMOVA, Tajima's D, WST, mismatch distribution) were used to explore the distribution and partitioning of mtDNA variation; principal coordinates analysis and neighbour-joining tree networks were used to explore allozyme variation. Results: Three main genetic groups exist across C. eremius/C. japalpa populations. The geographical distributions of these groups reflected the historical and current confluence point of major rivers in the region. Surprisingly, permanent desert springs did not contain higher genetic diversity than ephemeral rivers. Main conclusions: Genetic structuring of Chlamydogobius populations revealed unanticipated levels of connectivity, indicating that the ephemeral waters of Lake Eyre have allowed gene flow across drainage boundaries and large distances. Phylogeographic breaks reveal that connectivity relies on temporary surface water, while rapid temporal changes in diversity highlight flood-driven dispersal as the main means of gene flow between localities and habitats. Dispersal pathways reveal that ecological context (life history and tolerance of extreme conditions) has played a key role in shaping observed patterns.",
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    Dispersal in the desert: Ephemeral water drives connectivity and phylogeography of an arid-adapted fish. / Mossop, K; Adams, Mark; UNMACK, Peter; Smith Date, K; Wong, Bob; Chapple, David.

    In: Journal of Biogeography, Vol. 42, No. 12, 2015, p. 2374-2388.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Dispersal in the desert: Ephemeral water drives connectivity and phylogeography of an arid-adapted fish

    AU - Mossop, K

    AU - Adams, Mark

    AU - UNMACK, Peter

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    AU - Wong, Bob

    AU - Chapple, David

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    N2 - Aim: We examine landscape processes shaping the range-wide phylogeography of a dispersal-limited, desert-dwelling fish (the desert goby, Chlamydogobius eremius) in arid Australia. Location: South-western Lake Eyre Basin, central Australia. Methods: We obtained sequence data for the mitochondrial cytochrome b gene (n = 513 individuals) and nuclear genetic markers (51 allozyme loci; n = 128 individuals) to investigate the phylogeographic relationships among 51 populations. Sampling spanned multiple habitat types (permanent desert springs, ephemeral rivers) and sub-catchments, and the entire distribution of C. eremius and representatives of its sister species, Chlamydogobius japalpa. Phylogeographic analyses (genetic diversity, AMOVA, Tajima's D, WST, mismatch distribution) were used to explore the distribution and partitioning of mtDNA variation; principal coordinates analysis and neighbour-joining tree networks were used to explore allozyme variation. Results: Three main genetic groups exist across C. eremius/C. japalpa populations. The geographical distributions of these groups reflected the historical and current confluence point of major rivers in the region. Surprisingly, permanent desert springs did not contain higher genetic diversity than ephemeral rivers. Main conclusions: Genetic structuring of Chlamydogobius populations revealed unanticipated levels of connectivity, indicating that the ephemeral waters of Lake Eyre have allowed gene flow across drainage boundaries and large distances. Phylogeographic breaks reveal that connectivity relies on temporary surface water, while rapid temporal changes in diversity highlight flood-driven dispersal as the main means of gene flow between localities and habitats. Dispersal pathways reveal that ecological context (life history and tolerance of extreme conditions) has played a key role in shaping observed patterns.

    AB - Aim: We examine landscape processes shaping the range-wide phylogeography of a dispersal-limited, desert-dwelling fish (the desert goby, Chlamydogobius eremius) in arid Australia. Location: South-western Lake Eyre Basin, central Australia. Methods: We obtained sequence data for the mitochondrial cytochrome b gene (n = 513 individuals) and nuclear genetic markers (51 allozyme loci; n = 128 individuals) to investigate the phylogeographic relationships among 51 populations. Sampling spanned multiple habitat types (permanent desert springs, ephemeral rivers) and sub-catchments, and the entire distribution of C. eremius and representatives of its sister species, Chlamydogobius japalpa. Phylogeographic analyses (genetic diversity, AMOVA, Tajima's D, WST, mismatch distribution) were used to explore the distribution and partitioning of mtDNA variation; principal coordinates analysis and neighbour-joining tree networks were used to explore allozyme variation. Results: Three main genetic groups exist across C. eremius/C. japalpa populations. The geographical distributions of these groups reflected the historical and current confluence point of major rivers in the region. Surprisingly, permanent desert springs did not contain higher genetic diversity than ephemeral rivers. Main conclusions: Genetic structuring of Chlamydogobius populations revealed unanticipated levels of connectivity, indicating that the ephemeral waters of Lake Eyre have allowed gene flow across drainage boundaries and large distances. Phylogeographic breaks reveal that connectivity relies on temporary surface water, while rapid temporal changes in diversity highlight flood-driven dispersal as the main means of gene flow between localities and habitats. Dispersal pathways reveal that ecological context (life history and tolerance of extreme conditions) has played a key role in shaping observed patterns.

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