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Fig. 5. Kinematic variables plotted against fork length. (A) Turn angle; (B)
angular velocity; (C) duration; (D) curvature. Turn angle (A) and angular
velocity (B) show a biphasic pattern of change. The transition points as
identified by piecewise linear regression occur at
FL=1.18±0.28 cm for turn angle and
FL=1.16±0.23 cm for angular velocity. The piecewise regression
for turn duration (C) against FL, although significant overall, did
not have a significant transition point. Body curvature (D) did not have a
significant piecewise regression and so we interpret the rate of change as
constant across ontogeny with a slope of –16±6; a quadratic model
did not fit the data significantly better than a single linear regression
model. For further explanation of the regressions, see Statistics in
Materials and methods. In all graphs each point represents the mean value per
individual, from 2 or 3 turning sequences.
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