Fig.2. Relationship between the sugar transport rate through the proventriculus and the CO₂ production of bees fed 30µl of one of three different sucrose solutions. Each point represents a single bee. The lines in the graphs are not regression lines but are normlines, representing the expected sugar transport rate, calculated from the measured CO₂ production, assuming all the metabolic expenditure to be met from the imbibed sucrose solution. (A) Bees fed 15% sucrose solution that remained in the gas exchange chamber for 15min. (B) Bees fed 30% sucrose solution that remained in the gas exchange chamber for 30min. (C) Bees fed 50% sucrose solution, measured over 60min.