FIGURE 8.

Epinastine blocks the proboscis extension response (PER) of hungry honeybees. (A) Schematic overview of the experiment (above). Bees were fed to satiation with 30% (w/v) sucrose solution (0.88 M)18 h and again 15 min before drug injection. The PER was tested 15 min after drug injection with water (H₂O), with 0.1% (w/v) sucrose solution (2.9 mM) (0.1% sucrose), and with 43% (w/v) sucrose solution (1.25 M) (43% sucrose). Epinastine (EPI) did not affect the PER to these different solutions in sated bees (below). (B) Schematic overview of the experiment (above). Bees were fed to satiation with 30% (w/v) sucrose solution (0.88 M) 18 h before drug injection. The PER was tested 15 min after drug injection as described in (A). EPI blocked the PER of hungry bees (below). ^∗p < 0.05. Number of bees appears in brackets.