Primary genetic divergence in a system of populations coupled by migration

We investigate the mechanisms leading to genetic divergence in the system of panmectic populations coupled by migration and living in the habitat of the ring shape. It is considered the variants of unlimited and limited population growth. In the first case, divergence occurs as part of the transition process moving towards a genetically homogeneous population. In the second case, divergence occurs and persists, leading to a heterogeneous spatial distribution of individuals.