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Fig. 6. Mean (+S.D.) metabolic rates (the multiple of the basal
metabolism predicted by Kleiber's allometric equation;
Kleiber, 1975) of seven grey
seals during diving (DMR) or during rest (RMR) at the water surface. Resting
values are for alert, inactive animals breathing continuously. These data are
compared with values for the same individuals, on the same day, during diving.
The difference is significant (paired t-test, t=3.86,
P=0.003).