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Fig. 3. Feeding time (min) (A), crop load (mg) (B) and metabolic rates of foraging
ants (µW) (C) as a function of five different nectar concentrations (1, 5,
10, 30 and 50%) and a flow-rate of 1.18 µl min1. Values
are means ± s.e.m. (N=1317). Posteriori (Tukey
test after one-way ANOVA): a,b, P<0.01; a,c and b,c,
P<0.001; same letters do not differ significantly.