Fig. 2.

Number of bee individuals responding in dual-choice assays to synthetic mixtures resembling the flower scent of strawberry plants (Fragaria x ananassa) grown under optimum (blue) temperatures, and to negative controls (green) that consisted only of the solvent used to dilute the scent compounds. Workers of Apis mellifera and Bombus terrestris, and males and females of Osmia bicornis were used for the experiments. *: the two choices were differently attractive (p < 0.05) according to an exact binomial test of goodness-of-fit. N = number of replicates for each dual-choice assay (O. bicornis: 10 bees per replicate were placed in an indoor cage and assayed for 1 h; other species: free-flying bees in the outdoor flight-cage were observed for 1 h per replicate). This figure was provided by the authors