期刊
CONSERVATION GENETICS
卷 15, 期 3, 页码 547-560出版社
SPRINGER
DOI: 10.1007/s10592-013-0560-1
关键词
Potorous tridactylus; Microsatellite; Mitochondrial DNA; Population structure; Spatial autocorrelation; Relatedness
资金
- Holsworth Wildlife Research Endowment
- Margaret Middleton Fund for endangered Australian native vertebrate animals (The Australian Academy of Sciences)
- Geddes Postgraduate Award (The Australian Museum)
- M.A. Ingram Trust
- University of Melbourne
- Federal Australian Department of Environment and Heritage
- Victorian Department of Sustainability and Environment
- New South Wales National Parks and Wildlife Service
Fine-scale genetic structure was investigated in three regional populations of the long-nosed potoroo (Potorous tridactylus) a threatened endemic marsupial. Two populations were from the Australian mainland and one from an island. Populations were sub-sampled at two sites, 6-8 km apart, connected by suitable habitat for dispersal. Factors influencing fine-scale structure were investigated by genotyping 157 individuals at 10 microsatellite loci and sequencing a similar to 621 bp region of the mtDNA control region. Results indicated that P. tridactylus populations exhibit significant intra-population structure, with significant F (ST) and I broken vertical bar (ST) values recorded between subpopulations. This structure appeared mediated by small neighbourhood size, female philopatry and limited dispersal over 6-8 km, predominantly by males. Results highlighted several important features of P. tridactylus populations that have implications for conservation. Firstly, the small neighbourhood size suggests any investigations of intra-population structure should be conducted on a finer scale (e.g. 25-50 m) than many current monitoring programs. Secondly, the island populations were genetically depauperate, which may reflect processes occurring in many isolated 'mainland island' populations. Thirdly, the lower gene flow identified between populations separated by anthropogenically modified habitat suggests P. tridactylus is sensitive to changes in habitat configuration.
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