SCALE-SPECIFIC SEX-BIASED DISPERSAL IN THE VALAIS SHREW UNVEILED BY GENETIC VARIATION ON THE Y CHROMOSOME, AUTOSOMES, AND MITOCHONDRIAL DNA
Article first published online: 3 MAR 2012
© 2012 The Author(s). Evolution © 2012 The Society for the Study of Evolution.
Volume 66, Issue 6, pages 1737–1750, June 2012
How to Cite
Yannic, G., Basset, P., Büchi, L., Hausser, J. and Broquet, T. (2012), SCALE-SPECIFIC SEX-BIASED DISPERSAL IN THE VALAIS SHREW UNVEILED BY GENETIC VARIATION ON THE Y CHROMOSOME, AUTOSOMES, AND MITOCHONDRIAL DNA. Evolution, 66: 1737–1750. doi: 10.1111/j.1558-5646.2011.01554.x
- Issue published online: 1 JUN 2012
- Article first published online: 3 MAR 2012
- Accepted manuscript online: 29 DEC 2011 01:30PM EST
- Received September 1, 2011, Accepted December 1, 2011, Data Archived: Dryad doi:10.5061/dryad.8k3423ts
- Dispersal distance;
- hierarchical genetic structure;
- isolation by distance;
- Sorex antinorii
We investigated sex specificities in the evolutionary processes shaping Y chromosome, autosomes, and mitochondrial DNA patterns of genetic structure in the Valais shrew (Sorex antinorii), a mountain dwelling species with a hierarchical distribution. Both hierarchical analyses of variance and isolation-by-distance analyses revealed patterns of population structure that were not consistent across maternal, paternal, and biparentally inherited markers. Differentiation on a Y microsatellite was lower than expected from the comparison with autosomal microsatellites and mtDNA, and it was mostly due to genetic variance among populations within valleys, whereas the opposite was observed on other markers. In addition, there was no pattern of isolation by distance for the Y, whereas there was strong isolation by distance on mtDNA and autosomes. We use a hierarchical island model of coancestry dynamics to discuss the relative roles of the microevolutionary forces that may induce such patterns. We conclude that sex-biased dispersal is the most important driver of the observed genetic structure, but with an intriguing twist: it seems that dispersal is strongly male biased at large spatial scale, whereas it is mildly biased in favor of females at local scale. These results add to recent reports of scale-specific sex-biased dispersal patterns, and emphasize the usefulness of the Y chromosome in conjunction with mtDNA and autosomes to infer sex specificities.