Stacked frequency histograms of the diurnal A facultative low-light B and obligate low-light C bee species by the climate in which they were most frequently collected. Unknowns represent the species that could not be identified reliably to species or, in the case of two low-light species, those with no reliable coordinates (Suppl. material 6: Fig. S5). Patterned bars represent ‘diurnal’ species that were associated with facultative species, according to our PCA analyses (Fig. 4, Table 2); these species are indicated twice once in (A) and once in (B). Bolded numbers indicate the behavioural assignment of species without reassigning behavioural state according to PCA results (Table 1), numbers with asterisks indicate values according to PCA assignment (Table 2).