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Fig. 5. Metabolic rates of C. fluminea (J h-1 g-1 dry mass) over a time period of nearly 2 weeks, measured as heat dissipation (red) and rate of oxygen consumption O2 (transformed via the oxycaloric equivalent: 450 kJ mol-1 O2; black), recorded in artificial freshwater at 15°C. During the eighth day the water was bubbled with nitrogen.