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Fig. 3. Metabolic rate of European shags during various activities. Basal metabolic
rate (BMR) was measured in air temperatures between 10 and 19°C.
All measurements in water were made at water temperatures between 5 and
13°C. Values are grand means ± 1 S.D., which
were established from individual bird means. N=3 birds for all
activities except `preening', where N=1 bird. Asterisks indicate a
significant difference from BMR.