Fig. 7.

Respiratory traces (a and b) and simultaneously recorded body surface temperature curves (c and d) of a honeybee during foraging of 1.5 M sucrose solution in sunshine and shade, inside the measurement chamber shown in Figs. 2 and 6 (A in Fig. 1). Total CO₂ production per stay was determined from the trace integral plus the loss determined from the calibrations as shown in Fig. 3 (hatched areas in Fig. 7). Arrows: entering and leaving of the chamber. Note time delay of ∼37 s of respiratory against thermographic measurements.