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Rainfall and topography predict gene flow among populations of the declining northern quoll (Dasyurus hallucatus)

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Abstract

Landscape attributes often shape the spatial genetic structure of species. As the maintenance of genetic connectivity is increasingly a conservation priority, the identification of landscape features that influence connectivity can inform targeted management strategies. The northern quoll (Dasyurus hallucatus) is a carnivorous marsupial that has experienced dramatic population declines in recent decades. To inform management of surviving D. hallucatus populations across north-western Australia we examined the genetic structure of populations, and identified landscape features that influence gene flow within the Kimberley region. We sampled 249 individuals from 28 populations in three regions of north-western Australia, including the Kimberley, Pilbara and Kakadu. Genetic structuring was evident between the three regions and to a lesser extent between the north and central Kimberley. Landscape genetic analysis of Kimberley populations suggest this structuring may be due in part to the indirect effects of differences in rainfall between these two areas. Also, D. hallucatus populations with large areas of open habitat between them tended to be more genetically similar. Managing threats such as the occurrence of intense and frequent fires, and the density of introduced herbivores, could support the persistence of D. hallucatus populations, particularly in areas with high rainfall and flat terrain, where greater genetic connectivity confers a better chance of long-term population survival.

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Acknowledgments

This study was funded by supporters of the Australian Wildlife Conservancy, an Australian Research Council Linkage Grant (100100033), and the Department of Parks and Wildlife (Western Australia). The study methods were approved by the University of Tasmania Animal Ethics Committee (permit number A12516). This project would not have been possible without the support of staff at Australian Wildlife Conservancy’s Mornington Wildlife Sanctuary. Terry Webb also gave tremendous assistance sourcing and processing GIS layers. Also, thankyou to Alex Hartshorne, Hannah Cliff, Jillian Smith, Joel Murray, David James, Peter Richardson, Kaely Kreger, Davina Bright, Tom Crawford and Iris Bleach for their help with fieldwork.

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Authors and Affiliations

  1. School of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia

    Rosemary Hohnen, Christopher N. Johnson & Christopher P. Burridge

  2. Australian Wildlife Conservancy, Mornington Wildlife Sanctuary, PMB 925, Derby, WA, 6728, Australia

    Rosemary Hohnen, Katherine D. Tuft & Sarah Legge

  3. National Environmental Science Program, Threatened Species Recovery Hub, RIEL, Charles Darwin University, Darwin, NT, 0900, Australia

    Sarah Legge

  4. Molecular Systematics Unit/Terrestrial Zoology, Western Australian Museum, Kew St, Welshpool, Perth, WA, 6106, Australia

    Mia Hillyer

  5. School of Veterinary and Life Sciences, Murdoch University, 90 South St, Murdoch, Perth, WA, 6150, Australia

    Mia Hillyer & Peter B.S. Spencer

  6. Department of Parks and Wildlife, PO Box 942, Kununurra, WA, 6743, Australia

    Ian J. Radford

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  1. Rosemary Hohnen
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Hohnen, R., D. Tuft, K., Legge, S. et al. Rainfall and topography predict gene flow among populations of the declining northern quoll (Dasyurus hallucatus). Conserv Genet 17, 1213–1228 (2016). https://doi.org/10.1007/s10592-016-0856-z

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