Fig. 3. O2 consumption rates (µmol O2 h–1 g–1) of 19 Lolliguncula brevis (2.9–8.4 cm dorsal mantle length, DML) plotted as a function of swimming speed (mantle lengths s–1). Each data point is derived from the slope of percentage O2 saturation versus time curves recorded in the final 10 min interval of each speed trial. Linear or polynomial regression equations, r2 values and P-values are included in plots when a significant relationship was detected. As a result of limited data, linear or curvilinear relationships were not detected in some squid and, in these cases, data points were simply connected with lines. Mean rates of O2 consumption (µmol O2 h–1 g–1) for the three speed ranges are included for each squid (a, <0.5 DML s–1; b, 0.5–1.5 DML s–1; c, >1.5 DML s–1).