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Disease induced changes in gene flow patterns among Tasmanian devil populations

Citation

Bruniche-Olsen, A and Burridge, CP and Austin, JJ and Jones, M, Disease induced changes in gene flow patterns among Tasmanian devil populations, Biological Conservation, 165 pp. 69-78. ISSN 0006-3207 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier Ltd.

DOI: doi:10.1016/j.biocon.2013.05.014

Abstract

Infectious diseases of wildlife reduce population size and may erode genetic diversity, constituting an extinction threat. The Tasmanian devil (Sarcophilus harrisii) is threatened with extinction by an infectious cancer, the devil facial tumour disease (DFTD). In less than two decades, DFTD has caused a more than 85% overall population decline. We used ten polymorphic microsatellite loci to quantify the effects of this decline on genetic diversity, population differentiation, effective population size, and gene flow. Samples from 1999 and 2006 at five locations were analysed, three of which had been affected by DFTD during this time interval. Significant increases in inbreeding coefficient (𝑓) and non-significant reductions in effective population size were observed for both diseased and non-diseased populations, and therefore there was no consistent effect of DFTD. There was significant but stable structuring of genetic variation among locations through time, although a dynamic "source-sink" relationship was evident for gene flow associated with disease-mediated changes in population densities. These changes in gene flow may have contributed to the maintenance of genetic diversity in disease-affected areas. Simulations suggest that the estimated population declines, although severe, have been insufficient to yield significant changes in genetic variation; this may have been exacerbated by disequilibrium between population sizes and genetic diversity at the time of DFTD emergence, owing to elevated devil abundances following the extinction of the previous apex predator - the thylacine - approximately 80. years ago.

Item Details

Item Type:Refereed Article
Keywords:Population genetics
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Flora, Fauna and Biodiversity at Regional or Larger Scales
Author:Bruniche-Olsen, A (Ms Anna Bruniche-Olsen)
Author:Burridge, CP (Dr Christopher Burridge)
Author:Jones, M (Associate Professor Menna Jones)
ID Code:85280
Year Published:2013
Funding Support:Australian Research Council (LP0989613)
Web of Science® Times Cited:4
Deposited By:Zoology
Deposited On:2013-06-24
Last Modified:2017-10-31
Downloads:0

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