stochastic community dynamics

Gandon S & Nuismer SL 2009 Interactions between genetic drift, gene flow, and selection mosaics drive parasite local adaptation. Am Nat 173:212-224.

• after selection, gene flow between habitats occurred with the probability of moving between any pair of habitats i and j, assumed to be μ_H in the host and μ_P in the parasite
• after gene flow, mating took place within each population
• alleles mutated following standard deterministic population genetic recursions
• finally, each generation ended by sampling N_H host and N_P parasite individuals from each habitat, with the probability of drawing an individual given by the frequency of its genotype within the population
• we varied host and parasite population sizes to study the effect of genetic drift
• at the end of every generation, the different components of LA were calculated using equations (1) and (2)