Present address: Department of Biological Sciences, Humboldt State University, Arcata, California 95521, USA.
Historical demography and genetic structure of sister species: deermice (Peromyscus) in the North American temperate rain forest
Article first published online: 26 FEB 2003
Volume 12, Issue 3, pages 711–724, March 2003
How to Cite
Zheng, X., Arbogast, B. S. and Kenagy, G. J. (2003), Historical demography and genetic structure of sister species: deermice (Peromyscus) in the North American temperate rain forest. Molecular Ecology, 12: 711–724. doi: 10.1046/j.1365-294X.2003.01770.x
- Issue published online: 26 FEB 2003
- Article first published online: 26 FEB 2003
- Received 15 August 2002; revision received 15 November 2002; accepted 1 December 2002
- mitochondrial DNA;
- population expansion;
To investigate the evolutionary and biogeographical history of Peromyscus keeni and P. maniculatus within the coastal forest ecosystem of the Pacific Northwest of North America, we sampled 128 individuals from 43 localities from southeastern Alaska through Oregon. We analysed mitochondrial DNA variation using DNA sequence data from the mitochondrial cytochrome-b (cyt-b) gene and control region, and we found two distinct clades consistent with the morphological designation of the two species. The sequence divergence between the two clades was 0.0484 substitutions per site for cyt-b and 0.0396 for the control region, suggesting that divergence of the two clades occurred during the middle to late Pleistocene. We also examined the historical demography of the two clades using stepwise and exponential expansion models, both of which indicated recent rapid population growth. Furthermore, using the program migrate we found evidence of migration from populations north of the Fraser River (British Columbia) to the south in both clades. This study demonstrates the utility of these model-based demographic methods in illuminating the evolutionary and biogegographic history of natural systems.