Fig. S2.

Michealis–Menten kinetics for ammonium (Top) and nitrite (Bottom) oxidation combining data from this study with other field-based oxygen sensitivity tests (10, 12, 16). Rates were converted to percentages of the highest rate observed from each set of oxygen manipulation experiments, with the solid black line representing one-component Michealis–Menten type kinetics for the data obtained in this study only and the dashed line representing the combined datasets (combined datasets gave K_m values of 283 ± 64 and 622 ± 145 nmol⋅L⁻¹ O₂ for ammonium and nitrite oxidation, respectively). Error bars represent the SE.