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Fig. 6. Regression equation of vertical descent speed (relative to the bottom;
solid line) and effective swim speed relative to the fluid (calculated using
vector geometry; see Materials and methods), over a range of current speeds.
The dashed line is regression of effective swim speed at a dive angle of
10° with 95% confidence intervals. The shaded area indicates regression
equations from sensitivity analysis of dive angle from 0° (lower edge of
shaded area) to 20° (upper edge of shaded area). Effective swim speed was
regulated across currents at a relatively constant value of 1.24±0.14 m
s–1 while vertical descent velocity decreased non-linearly.
Regression equations are presented in Table
1.
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