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Fig. 4. (A) Simulated oxygen saturation curve for an imperial cormorant during time
at the surface after dives. The arrows show the calculated pre- and post-dive
oxygen concentrations for dives of two different durations. (B) Projected pre-
(upper lines) and post- (lower) dive body oxygen concentrations as a function
of steady state diving for dives of particular durations in the imperial
cormorant. The value between the upper and lower curves shows the oxygen used
during the dive, and the value between the lower curve and the x-axis
shows the oxygen reserve carried by the bird. Varying values of the rate
constant, k, shift the curves up or down.