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Figure 4


Fig. 4. Final PO2 and dive duration. Final PO2 values were recorded within the last 15 s of each dive. (A) Final venous PO2 and dive duration from nine emperor penguins (key shows individual symbols for each penguin). The variability in final PO2 values in relation to dive duration is presumably secondary to differences in metabolic rates during dives. In addition, the span of PO2 values at the aerobic dive limit (ADL) clearly indicates that the blood O2 store is not depleted at this limit, the dive duration associated with post-dive lactate accumulation. The exponential regression (y=96.416e–0.1216x, r2=0.94, P<0.001) was constructed from the highest final PO2 during each 1-min interval of dive duration. This represents the minimum rate at which final PO2 declines in relation to dive duration. (B) Comparison of final venous PO2, arterial PO2 and air sac PO2 (Stockard et al., 2005) demonstrates that air sac, arterial and venous PO2 values become indistinguishable in longer dives.





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