Abstract
AbstractThe interrelationship between Acetivibrio cellulolyticus and Clostridium saccharolyticum, two anaerobes recently isolated from a methanogenic cellulose‐enriched culture, was studied in an examination of the role of saccharolytic anaerobes in habitats where cellulose is converted to methane. The presence of Cl. saccharolyticum decreased cellulose degradation by A. cellulolyticus as a result of substrate competition. Nevertheless A. cellulolyticus provided essential growth factor(s) and assimilable sugars including glucose which A. cellulolyticus itself does not utilize. Cl. saccharolyticum converted sugars to acetic acid and H2, known substrates for methanogens, and ethanol and lactic acid, known substrates for sulphate reducing bacteria. In natural habitats, the presence of both methanogens and sulphate reducing bacteria is essential for the existence of cellulolytic anaerobes.
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