Fig. 2.

Relationship between the number of bumblebee visits and the number of flowers available, expressed as phylogenetically independent contrasts of log-transformed data, for each of five bumblebee species and for all five species combined. Species are as indicated in the key: note that the line for Bombus hortorum (blue) is hidden behind that of B. pratorum (purple). Whole-model R²_adj = 0·34, F_6,67 = 7·21, P < 0·001. The interaction PICs of flower number × bumblebee species, which tests for slope differences between bumblebee species, was not significant (F_5,67 = 0·22, P = 0·95).