Production of 14CH4 (A) and 14CO2 (B) during anaerobic incubations of Searsville Lake soil slurries containing 1,215 nCi of [2-14C]acetate. Symbols: ▵, no additions; ○, 0.05 kPa of DFM added; ▿, 0.1 kPa of DFM added; ◊, 0.1 kPa of MeF added. Error bars indicate ±1 standard deviation of the mean of three slurries. The absence of error bars indicates that the error was smaller than the symbol size.