Fig. 3.

Extinction time of either genotype of either host or parasite population for different initial population sizes of the parasite N_P for all models. We show the mean extinction time of any genotype over 1000 independent simulations (fat dots) and the distribution of those extinction times (shaded histogram area around the mean). The simulations start with equal abundance of both genotypes H₁(0)=H₂(0)=N_H/2 and P₁(0)=P₂(0)=N_P/2. Lines denote approximate results based on the average noise (see Additional file 1). The discrete time processes are simulated for values of N_P for which analytical results are valid. The Evo ⁺ process is not simulated for high parasite population sizes since the computation becomes extremely time-consuming and the trend is already clear. Parameters as in Fig. 1 except N_H=250,K=500, birthrate b_h∈{0.24,0.32,...,1.6} in the EcoEvo ⁺ and for the EcoEvo model b_h∈{0.12,0.16,...,0.8} and μ=0 to achieve the population sizes N_P displayed