Fig. 2. Oxygen consumption for a specimen (1.24 g wet mass) of Methanoaricia dendrobranchiata at 8 °C. (A) Changes in the oxygen concentration in the chamber during the experiment. Readings were taken every 5 min. (B) Calculated oxygen consumption rate as a function of oxygen concentration for the same worm. Regression (i): r²=0.006, N=54, P=0.589; regression (ii): r²=0.903, N=20, P<0.0005. P_c, critical pressure.