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Fig. 2. The body movements from the digitized video clip of a two-year-old calf
swimming independently at 3.84 m s-1. Movements of the rostrum are
in pink, cranial insertion of the dorsal fin is in yellow and the fluke tip is
shown in blue. In this case, the dolphin swam from right to left, thus the
orientation of the body parts was flipped in the y-plane during the
coordinate transformation process (see Materials and methods). The magnitude
of the distance between digitized points remains the same and is used in the
calculations for swim effort. Peak-to-peak fluke stroke amplitude is the fluke
displacement and is the difference in the y-coordinates of successive
maximums and minimums (i.e. B-A and B-C) measured in m. Tailbeat frequency is
the number of strokes s-1, where one stroke is adjacent maximums or
adjacent minimums (i.e. one stroke is from A to C).
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