H2 and CO2 levels after dark, anoxic acclimation.

H2 (A, C) and CO2 (B, D) detected from sealed vials during dark, anoxic acclimation of Tetraselmis GSL1 (A, B) and Tetraselmis QNM1 (C, D). Cells were grown and acclimated to anoxia in f/2 medium adjusted to the indicated NaCl levels (w/v). Error bars represent standard deviations from 14 (H2) and 6 (CO2) experimental repetitions.