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  • Mitogenomic analysis of the Australian lungfish (Neoceratodus forsteri) reveals structuring of indigenous riverine populations and late Pleistocene movement between drainage basins

    Author(s)
    Bishop, Cameron R
    Hughes, Jane M
    Schmidt, Daniel J
    Griffith University Author(s)
    Hughes, Jane M.
    Schmidt, Daniel J.
    Year published
    2018
    Metadata
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    Abstract
    Neoceratodus forsteri: is a freshwater species of Dipnoan currently listed as ‘vulnerable to extinction’ under Australian legislation. The species is restricted to at least two indigenous riverine populations in southeastern Queensland, and several other putatively translocated populations. Current understanding of genetic relationships among populations is based on studies of allozymes, microsatellites and mitochondrial DNA (mtDNA) fragments. A notable feature of all these datasets was low genetic variability. Here we sequence the complete mitogenome of 71 N. forsteri individuals from five populations to improve resolution ...
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    Neoceratodus forsteri: is a freshwater species of Dipnoan currently listed as ‘vulnerable to extinction’ under Australian legislation. The species is restricted to at least two indigenous riverine populations in southeastern Queensland, and several other putatively translocated populations. Current understanding of genetic relationships among populations is based on studies of allozymes, microsatellites and mitochondrial DNA (mtDNA) fragments. A notable feature of all these datasets was low genetic variability. Here we sequence the complete mitogenome of 71 N. forsteri individuals from five populations to improve resolution of mtDNA diversity, examine relationships among populations, and evaluate recent demographic history. We recorded 137 variable positions forming 41 haplotypes in the 16,573 bp mitogenome alignment. Strong genetic structure was observed among riverine samples (global ΦST = 0.342) in a pattern consistent with translocation history. Tinana Creek was confirmed as an isolated and genetically unique subpopulation that should be recognized as a distinct management unit. Two previously unreported mtDNA clades (0.46% mean divergence) were found and suggest that genetic exchange among coastal catchments may have been facilitated by riverine connections on the exposed continental shelf during the late Pleistocene. Extended Bayesian skyline analysis showed no evidence for recent historical change in female effective population size, and codon-based selection tests found no evidence for positive selection in coding genes. Overall, our results emphasise the utility of the full mtDNA molecule for capturing population structure in taxa with low genetic diversity. In such cases, informative variation may be scattered across disparate parts of the mitogenome. Surveying relatively short fragments of mtDNA may lead to significant underestimates of population structure when applied to threatened species with low genetic diversity.
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    Journal Title
    Conservation Genetics
    DOI
    https://doi.org/10.1007/s10592-017-1034-7
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Environmental sciences
    Biological sciences
    Genetics not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/370077
    Collection
    • Journal articles

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