Do the differing pollen foraging strategies of <i>Megachile sp.</i> and <i>Bombus spp.</i> result in differing pollen removal and deposition rates in <i>Lupinus bakeri</i>?
Abstract
Mutualistic interactions between flowering plants and bees are a pairwise interaction, but exist in a network of similar interactions (Bronstein, 2001). The outcomes of these interactions differ, for example, the costs and benefits for flowering plants caused by floral visitors (Bronstein, 2001). Lupinus bakeri is a pollen-rewarding plant species that controls the amount of pollen removed by each floral visitor (Gori 1989; Harder 1990a). The bee genera Bombus spp. and Megachile sp. remove pollen differently from Lupinus bakeri, perhaps affecting the reproductive success of the plant differently. We assessed whether pollen removal and deposition rates are different for each bee genus through a interview stick based observational study. More Bombus spp. visited Lupinus bakeri than Megachile sp., but we did not detect a statistically significant difference in removal and deposition rates between bee taxa.
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