Flower constancy in bumblebees: a test of the trait variability hypothesis

Pollinators often sequentially visit one flower type while bypassing other equally rewarding flower types in the process. Many explanations for this pattern of flower choice in pollinators, known as flower constancy, have been proposed; yet, a sufficient answer to the question of why pollinators are constant still remains elusive. We tested the hypothesis that flower constancy in pollinators is related to the number of traits distinguishing...