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Fig. 3. Typical changes of heave (solid line) and surge (dotted line) acceleration
of a common guillemot (COGU) and a little penguin (LIPE) during descent at
depths of 2 m and 20 m and during the bottom phase of the dive. Crosses along
the line for surge indicate samples at 64 Hz. Downstrokes were assumed to
occur during periods of positive heave, as indicated by bold horizontal bars.
For COGU, the second small peak of heave was observed at the end of the
downstroke at 2 m and 20 m. The horizontal dotted bar in the panel for
horizontal swimming during the bottom phase by COGU indicates a glide when
there was little heave or surge. Circles show peaks of surge acceleration,
indicating forward thrust during upstroke (filled circles) and downstroke
(open circles).
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