Figure 2.

Boxplots of mean sucrose transfer rates for B. terrestris bumblebees during drinking and offloading of sucrose solution of 35%, 50% and 65% w/w, expressed as volumetric and energy transfer rates. n = 10 bees per concentration; each observation (bee) is the mean of 10 foraging bouts. Boxes are interquartile ranges, thick lines are medians and crosses indicate overall means. The open circles are outliers. (a) Volumetric drinking rate, (b) volumetric offloading rate, (c) energy uptake rate, (d) energy offloading rate.