Fig. 6. Relation of energy losses and gains expressed in µW for different nectar flow-rates and concentrations. Energy expenditures are measured metabolic rate of ant workers and the energy gain is calculated from the sucrose concentration and flow rate delivery of sugar solution from the artificial feeder. (a) 0.236 µl min^–1 flow rate and 1% sucrose concentration, (b) 1.18 µl min^–1 and 1%, (c) 0.236 µl min^–1 and 5%, (d) 1.18 µl min^–1 and 5%, (e) 0.236 µl min^–1 and 30%, (f) 2.36 µl min^–1 and 5%, (g) 1.18 µl min^–1 and 10%, (h) 1.18 µl min^–1 and 30%, (i) 1.18 µl min^–1 and 50%, and (j) 2.36 µl min^–1 and 30%. Note the logarithmic scale of the x-axis.