Genetic differentiation and introgression amongst Thylogale (pademelons) taxa in eastern Australia
M. D. B. Eldridge A B H , K. Heckenberg C , L. E. Neaves A D , C. J. Metcalfe B E , S. Hamilton F , P. M. Johnson G and R. L. Close C
+ Author Affiliations
- Author Affiliations
A Molecular Genetics, Australian Museum, 6 College Street, Sydney, NSW 2010, Australia.
B Department of Biological Sciences, Macquarie University, NSW 2109, Australia.
C School of Biomedical and Health Sciences, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia.
D Current Address: Royal Botanic Garden, Edinburgh, EH3 5LR, UK.
E Current Address: Institute of Biosciences, University of São Paulo, São Paulo, SP 05508-090, Brazil.
F School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2052, Australia.
G Queensland Parks and Wildlife Service, Northern Regional Centre, Pallarenda, PO Box 5597, Townsville Mail Centre, Qld 4810, Australia.
H Corresponding author. Email: mark.eldridge@austmus.gov.au
Australian Journal of Zoology 59(2) 103-117 https://doi.org/10.1071/ZO11022
Submitted: 18 March 2011 Accepted: 26 June 2011 Published: 7 October 2011
Abstract
Although pademelons (Thylogale) are widespread and common in coastal eastern Australia, they have been largely neglected in population genetic studies. Here we use 10 microsatellite loci and the mitochondrial DNA (mtDNA) cytochrome b (Cytb) gene to examine genetic differentiation amongst populations of the red-necked (Thylogale thetis) and red-legged (T. stigmatica) pademelon in eastern Australia. Evidence of hybridisation was detected between subspecies of T. stigmatica in central Queensland. Specimens sampled between Eungella and Sarina were found to represent a broad (~90 km) zone of introgression, for both nuclear and mtDNA markers, between T. s. stigmatica (Wet Tropics) and T. s. wilcoxi (south-east Queensland). In addition, individuals sampled from around Proserpine were genetically T. s. stigmatica rather than T. s. wilcoxi, as had previously been assumed. This observation raises some intriguing questions about the dispersal ability of T. stigmatica and the phylogeographic history of moist forest taxa in eastern Australia. Only limited evidence of introgression was detected between sympatric populations of T. thetis and T. s. wilcoxi in south-east Queensland.
Additional keywords: Macropodidae, marsupial, microsatellites, mitochondrial DNA, phylogeography.
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