Data from: Invasion genetics of the introduced black rat (Rattus rattus) in Senegal, West Africa

An understanding of the evolutionary history and dynamics of invasive
species is required for the construction of predictive models of future
spread, and the design of biological management measures. The black rat
(Rattus rattus) is a major vertebrate invader with a worldwide
distribution. Despite the severe ecological, economic and health impacts
of this species, its evolutionary history has been little studied. We
carried out extensive specimen sampling in Senegal, West Africa, and used
microsatellite markers to describe the pattern and processes of invasion
in this large continental area. The genetic data obtained were combined
with historical knowledge concerning the presence of this species in
Senegal. Data were analyzed by a combination of Bayesian clustering and
approximate Bayesian computation methods. The invasion pathways closely
paralleled the history of human trade routes in Senegal. In several
places, we detected the occurrence of multiple introductions from
genetically different sources. Long-distance migration between towns and
villages was also observed. Our findings suggest that genetic bottlenecks
and admixture have played a major role in shaping the genetics of invasive
black rats. These two processes may generate genetic novelty and favor
rapid evolution along the invasion pathways.