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Temporal changes in mate availability and S-allele richness for populations initiated with 20 S alleles for a range of different pollination probabilities (P = 0·01 to P = 1·0): (A, B) show results for mate availability for gametophytic and sporophytic self-incompatibility systems, and (C, D) show results for S-allele richness. All data represent mean observed parameter values based on 100 independent simulation runs.
