Abstract
Methanogenesis and sulfate-reduction were followed in laboratory incubations of sediments taken from tropical seagrass beds. Methanogenesis and sulfate-reduction occurred simultaneously in sediments incubated under N 2, thereby indicating that the two processes are not mutually exclusive. Sediments incubated under an atmosphere of H 2 developed negative pressures due to the oxidation of H 2 by sulfate-respiring bacteria. H 2 also stimulated methanogenesis, but methanogenic bacteria could not compete for H 2 with the sulfate-respiring bacteria.
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