Present addresses: Department of Genetics, La Trobe University, Victoria 3083, Australia. †Evolutionary Biology Unit, South Australian Museum, North terrace, Adelaide, SA 5000, Australia.
The impact of habitat fragmentation on dispersal of Cunningham’s skink (Egernia cunninghami): evidence from allelic and genotypic analyses of microsatellites
Article first published online: 21 DEC 2001
Volume 10, Issue 4, pages 867–878, April 2001
How to Cite
Stow, A. J., Sunnucks, P., Briscoe, D. A. and Gardner, M. G. (2001), The impact of habitat fragmentation on dispersal of Cunningham’s skink (Egernia cunninghami): evidence from allelic and genotypic analyses of microsatellites. Molecular Ecology, 10: 867–878. doi: 10.1046/j.1365-294X.2001.01253.x
- Issue published online: 21 DEC 2001
- Article first published online: 21 DEC 2001
- Received 7 June 2000; revision received 5 November 2000; accepted 5 November 2000
- Egernia cunninghami;
- microsatellite DNA;
- spatial autocorrelation
The effects of habitat fragmentation on processes within and among populations are important for conservation management. Despite a broad spectrum of lifestyles and the conservation significance of many reptiles, very little work on fine-scale population genetics has been carried out on this group. This study examines the dispersal patterns of a rock crevice-dwelling lizard, Cunningham’s skink (Egernia cunninghami), in a naturally vegetated reserve and an adjacent deforested site. Both genotypic and genic approaches were employed, using microsatellite loci. The spatial organization of individuals with respect to pairwise relatedness coefficients and allele frequencies, along with assignment tests, were used to infer dispersal characteristics for both sexes in a natural and a cleared area. The distribution of relatedness in both habitats was spatially structured, with E. cunninghami showing high pairwise relatedness within their rocky retreat sites. Analysis of relatedness over different spatial scales, spatial autocorrelation of alleles and assignment tests, all indicated that both sexes in the cleared area show less dispersal than their counterparts in the reserve. Furthermore, deforestation may inhibit female dispersal to a greater extent than that of males. The geographical structuring of allele frequencies for adults in the cleared area, but not the reserve, indicates that habitat fragmentation has the potential to alter at least the microevolution of E. cunninghami populations.