The
breeding system of a species determines the way whereby
seeds will be produced, and the degree of dependency of
plants on pollinators for seed set (Lovett-Doust and
Lovett-Doust, 1988; Richards, 1997). Reproductive
failure in plants can often be attributed to either
pollination limitation where the movement of viable
pollen between flowers through the absence of pollina-tors is insufficient (Bierzychudek, 1981; but see Zimmer-man and Pyke, 1988),