Fig. 4. Relationship of swimming speed (U) and turning radius (R) for horizontal turning maneuvers by whirligig beetles. Squares and triangles represent turns produced by rowing of the legs; circles represent turns executed by winged-swimming. Triangles represent data for the minimum 20% of radii for all turns measured. The upper regression line (r=0.336, P<0.05; see text for the equation of the line) was fit to all data; the lower regression line (r=0.310, P<0.20) was fit to the minimum 20% of turning radii.

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