Figure 7.

Changes in wave resistance (in red) and fluid resistance (in blue) as a function of the speed of whirligig beetles (G. substriatus). Wave resistance is non-dimensioned by its maximum, and fluid resistance is non-dimensioned by its value at 80 cm s⁻¹ (0.215 mN), which is the maximum speed observed in our experiments. Dashed lines represent the mean speed for the three types of leg kinematics and shaded rectangles represent the standard errors of these means. Type I (I) and type II (II) have been grouped together, because their standard deviations overlap. These two types of kinematics correspond to low-speed leg kinematics, whereas type III (III) corresponds to high-speed leg kinematics.