TABLE 3.

MPN of cultured anaerobes and methanogens in acidic bog peat

Metabolic typeMediumSubstrateMPN of organisms g (dry wt) of soil−1a
General fermentative anaerobesTSB (pH 4.5)Complex1 × 109 (2 × 108-5 × 109)
MethanogensTSB (pH 4.5)Complex1 × 106 (3 × 105-6 × 106)
H2-CO2-utilizing methanogensUM (pH 4.5)H2-CO23 × 107 (6 × 106-1 × 108)
H2-CO2-utilizing methanogensUMab (pH 4.5)H2-CO23 × 102 (7 × 101-2 × 103)
  • a Values in parentheses represent confidence intervals with 95% probability.