Fig. 3. Phototaxis behavior in honey bees as a function of behavioral state or treatment. (A) Differences in positive phototaxis between nurses and foragers. Group size=20 bees. 2x2 ² tests were conducted for both trials. (B) Effects of 8-Br-cGMP, 8-Br-cAMP on positive phototaxis. Nine trials were conducted; data on the proportion showing positive phototaxis from each trial were arcsine transformed for ANOVA. For graphical purposes, means ± S.E.M. were back-transformed (resulting in asymetrical error bars). For doses, see Materials and methods. `Light', phototaxis behavior when light source is on; `Dark', locomotion control when light source is off.