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Figure S1. Selection on a modifier increasing the recombination rate (rmm = 0.1, rmM = 0.15, rMM = 0.2) for different selection pressures on hosts (sH) and parasites (sP) with k = 3(a)and k = 4(b). Both npg = 1 and npg = 5 were tested. The selection coefficients sH and sP range from 0 to 1 with 0.01 gradation, and each of the 10,000 points on the graph shows the average result of 20 simulation runs (10 for each value of npg) with different random initial conditions. The graph shows whether the allele M increases or decreases in frequency, using the following color code: red (increase when npg = 1 or npg = 5), blue (decrease when npg = 1 or npg = 5), orange (increase when npg = 5, decrease when npg = 1) and yellow (decrease when npg = 5 and increase when npg = 1). No change from the initial frequency is graphically displayed as a decrease (e.g. when sH or sP = 0).

Figure S2. Simulation of multiple parasite populations. In the simulation runs of these figures, hosts have 4 (a) or 6 (b) loci. There are two (a) or three (b) independent parasite species, and they each have 2 interaction loci. Parasite population 1 interacts with the host at the first pair of host loci, parasite population 2 interacts with the host at the second pair of host loci etc. (i.e. given six host interaction loci ABCDEF, parasite population 1 interacts at loci AB, parasite population 2 at loci CD, parasite population 3 at loci EF). Note that if a host is infected by n parasite species, its fitness is (1-sH)n. Color code is the same as in figure S1 and figure 1 in the main text.

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EVO_figs2.pdf611KSupporting info item

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