ECOLOGY AND EVOLUTION OF PLANT MATING

Plants exhibit complex mating patterns because of their immobility, he rmaphroditism and reliance on vectors for pollen transfer. Research on plant mating attempts to determine who mates with whom in plant popul ations and how and why mating patterns become evolutionarily modified. Most theoretical models of mating-system evolution have focused on th e fitness consequences of selfing and outcrossing, stimulating conside rable empirical work on the ecology and genetics of inbreeding depress ion. Less attention has been given to how the mechanics of pollen disp ersal influence the transmission of self and outcross gametes. Recent work on the relation between pollen dispersal and mating suggests that many features of floral design traditionally interpreted as anti-self ing mechanisms may function to reduce the mating costs associated with large floral displays.