Fig. 9. Log-transformed diving metabolic rate (DMR) plotted against dive duration for all dives. Also indicated is the boundary defined by quantile regression of the 95th percentile plus upper and lower 95% confidence limits to this line. The regression is significant at P<0.05. The thick, broken line represents the relationship between maximum possible aerobic log DMR and dive duration, based on maximum utilisation of body oxygen stores during the dive.