Flower constancy
There was a statistically significant interaction between the effects of bee species and period on the percentage of flower constant foragers at both the morphotype and family levels (Table 3; Fig 2). During all periods, except period 3, a greater proportion of honey bee foragers collected pollen from one plant morphotype or family (e.g. higher flower constancy) relative to bumble bees (Fig. 2). In period 3, rates of flower constancy were similar between the two bee species (Fig. 2). Flower constancy did not vary among sites for either bee species (Table 3).