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Fig. 7. Log transformation of dive heart rate (fH) vs
mean dive stroke frequency (A) and mean dive stroke frequency vs dive
duration (B), N=5 birds, 47 dives. As seen in the linear fits in A
the log of dive fH does not have a significant
relationship to stroke frequency (y=0.508x+1.27,
r2=0.082, P=0.051), and in B, dive stroke
frequency has a significant, but weak negative relationship to dive duration
(y=–17.70x+0.72, r2=0.267,
P=0.0002).