Spatial gene frequency waves under genotype dependent dispersal Journal Article

Author(s): Novak, Sebastian; Kollár, Richard
Article Title: Spatial gene frequency waves under genotype dependent dispersal
Affiliation IST Austria
Abstract: Dispersal is a crucial factor in natural evolution, since it determines the habitat experienced by any population and defines the spatial scale of interactions between individuals. There is compelling evidence for systematic differences in dispersal characteristics within the same population, i.e., genotype-dependent dispersal. The consequences of genotype-dependent dispersal on other evolutionary phenomena, however, are poorly understood. In this article we investigate the effect of genotype-dependent dispersal on spatial gene frequency patterns, using a generalization of the classical diffusion model of selection and dispersal. Dispersal is characterized by the variance of dispersal (diffusion coefficient) and the mean displacement (directional advection term). We demonstrate that genotype-dependent dispersal may change the qualitative behavior of Fisher waves, which change from being “pulled” to being “pushed” wave fronts as the discrepancy in dispersal between genotypes increases. The speed of any wave is partitioned into components due to selection, genotype-dependent variance of dispersal, and genotype-dependent mean displacement. We apply our findings to wave fronts maintained by selection against heterozygotes. Furthermore, we identify a benefit of increased variance of dispersal, quantify its effect on the speed of the wave, and discuss the implications for the evolution of dispersal strategies. © 2017 by the Genetics Society of America.
Keywords: Dispersal evolution, Fisher wave, population genetics, selection-migration dynamics, wave speed
Journal Title: Genetics
Volume: 205
Issue 1
ISSN: 0016-6731
Publisher: Genetics Society of America  
Date Published: 2017-01-01
Start Page: 367
End Page: 374
DOI: 10.1534/genetics.116.193946
Open access: yes (repository)