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    Pedigree reconstruction using molecular data reveals an early warning sign of gene diversity loss in an island population of Tasmanian devils (Sarcophilus harrisii)

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    Issue Date
    2018
    Author
    McLennan, Elspeth A.
    Gooley, Rebecca M.
    Wise, Phil
    Belov, Katherine
    Hogg, Carolyn J.
    Grueber, Catherine E.
    Subject
    AUSTRALIA
    TASMANIAN DEVILS
    CANCER
    POPULATIONS
    POPULATION GENETICS
    Journal title
    Conservation Genetics
    Volume
    19
    Issue
    2
    Begin page
    439
    End page
    450
    
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    DOI
    10.1007/s10592-017-1017-8
    Alternative link
    https://link.springer.com/article/10.1007/s10592-017-1017-8
    Abstract
    Tasmanian devils have experienced an 85% population decline since the emergence of an infectious cancer. In response, a captive insurance population was established in 2006 with a subpopulation later introduced onto Maria Island, Tasmania. We aimed to (1) examine the genetic parameters of the Maria Island population as a stand-alone site and within its broader metapopulation context, (2) assess the efficacy of assisted colonisations, and (3) inform future translocations. This study reconstructs the pedigree of 86 island-born devils using 31 polymorphic microsatellite loci. Combined molecular and pedigree analysis was used to monitor change in population genetic parameters in 4 years since colonisation. Molecular analysis alone revealed no significant change in genetic diversity, while DNA-reconstructed pedigree analysis revealed a statistically significant increase in inbreeding due to skewed founder representation. Pedigree modelling predicted that gene diversity would only be maintained above the threshold of 95% for a further 2 years, dropping to 77.1% after 40 years. Modelling alternative supplementation strategies revealed introducing eight new founders every 3 years will enable the population to retain 95% gene diversity until 2056, provided the translocated animals breed; to ensure this we recommend introducing ten new females every 3 years. We highlight the value of combining pedigree analyses with molecular data, from both a single-site and metapopulation viewpoint, for analysing changes in genetic parameters within populations of conservation concern. The importance of post-release genetic monitoring in an established population is emphasised, given how quickly inbreeding can accumulate and gene diversity be lost.
    URI
    http://hdl.handle.net/20.500.12634/169
    Type
    Article
    Rights
    © Springer Science+Business Media B.V. 2017
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10592-017-1017-8
    Scopus Count
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    SDZWA Research Publications

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