Joint effects of pollination probability and S-allele number on population size and long-term persistence: (A, B) show results for population size for gametophytic and sporophytic self-incompatibility systems, and (C, D) show results for population persistence. For all graphs, the lines represent different pollination probabilities, as indicated in the key. SC = self-compatible. All data represent mean observed parameter values based on 100 independent simulation runs.