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. 2011 Sep 26;108(40):16618-16621. doi: 10.1073/pnas.1108642108

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Fig. 2. — The dependence of scaled volumetric flow rate on nectar viscosity μ (2, 5, 8, 9, 12, 13, 16, 24, 26, 28, 29, 31, 32). The red points represent data for active suction, the blue points for capillary suction, and the green points for viscous dipping. The slopes of the expected lines for suction and viscous dipping are -1/2 and -1/6, respectively. Inset: Optimal concentrations for suction feeding (33%) and viscous dipping (52%), calculated from the dependence of relative energy intake rate on nectar viscosity, are denoted by vertical bands. Characteristic error bars are shown.

Inline graphic — The dependence of scaled volumetric flow rate on nectar viscosity μ (2, 5, 8, 9, 12, 13, 16, 24, 26, 28, 29, 31, 32). The red points represent data for active suction, the blue points for capillary suction, and the green points for viscous dipping. The slopes of the expected lines for suction and viscous dipping are -1/2 and -1/6, respectively. Inset: Optimal concentrations for suction feeding (33%) and viscous dipping (52%), calculated from the dependence of relative energy intake rate on nectar viscosity, are denoted by vertical bands. Characteristic error bars are shown.