Fig. 2. The effect of autotomy on metabolic rate (J s^–1 kg^–1, measured as _CO2 and converted to J [assuming an energy equivalent of 23.3 J ml CO₂^–1 (Duncan, 1999)] in 18 male field crickets Gryllus bimaculatus. Resting (R_CO2; speed 0 m s^–1) and active (A_CO2) metabolic rates (MR) were measured for each individual (two data points per individual are shown). Although there is a strong effect of speed on active metabolic rate, the effect of autotomy treatment (autotomised vs control/intact animals) was significant. Regression lines are drawn to fit active measurements.