Fixation properties of subdivided populations with balancing selection
arXiv:1407.4656 · doi:10.1103/PhysRevE.91.032130
Abstract
In subdivided populations, migration acts together with selection and genetic drift and determines their evolution. Building up on a recently proposed method, which hinges on the emergence of a time scale separation between local and global dynamics, we study the fixation properties of subdivided populations in the presence of balancing selection. The approximation implied by the method is accurate when the effective selection strength is small and the number of subpopulations is large. In particular, it predicts a phase transition between species coexistence and biodiversity loss in the infinite-size limit and, in finite populations, a nonmonotonic dependence of the mean fixation time on the migration rate. In order to investigate the fixation properties of the subdivided population for stronger selection, we introduce an effective coarser description of the dynamics in terms of a voter model with intermediate states, which highlights the basic mechanisms driving the evolutionary process.
arXiv comment19 pages, 13 figures
References in corpus (11)
- Nonequilibrium Critical Phenomena and Phase Transitions into Absorbing States
- Coevolutionary Dynamics: From Finite to Infinite Populations
- Genetic Demixing and Evolutionary Forces in the One-Dimensional Stepping Stone Model
- Genetic drift opposes mutualism during spatial population expansion
- Fixation and consensus times on a network: a unified approach
- Competition and cooperation in one-dimensional stepping stone models
- Effective surface-tension in the noise-reduced voter model
- Algebraic coarsening in voter models with intermediate states
- Asymmetric Mutualism in Two- and Three-Dimensional Range Expansions
- Fast-mode elimination in stochastic metapopulation models
- Fast migration and emergent population dynamics