Fig. 3. Nectar intake rate depends on nectar viscosity not nectar sweetness in laboratory feeding trials with Euglossa imperialis. Constant sucrose experiment (filled circles): sucrose concentration was held at 25% and solution temperature was maintained 30°C as viscosity was increased to the equivalent of a 65% sucrose solution. Constant viscosity experiment (open circles): viscosity was held at the equivalent of 50% sucrose (10.21 mPa s) and solution temperature was maintained at 30°C as sucrose concentration ranged from 5-50%. Sucrose concentration has no effect on nectar intake rate (F_1,28=0.2301, P=0.6352).