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Fig. 4. Changes in acceleration parallel to the body fuselage (surge) throughout
single swimming strokes by a Brünnich's guillemot (BRGU 13) during
descent (A–C) and horizontal swimming at the bottom of a dive (D).
Curves for depths >2 m during descent and at the bottom represent pooled
groups of strokes with similar curves (numbers of pooled strokes in
parentheses). Plots are of deviations from the mean acceleration during an
entire stroke (including upstroke and downstroke), based on regression
equations fitted to accelerometer recordings at 0.03125 s intervals (32 Hz).
The first peak is for the upstroke, and the second for the downstroke. The
first two entire strokes encompass a change in body angle from horizontal to
vertical, perhaps confounding surge measurements.
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