Methane oxidation rates in the anaerobic sediments of Saanich Inlet1

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Abstract
Anaerobic methane oxidation rates were determined in the anoxic sediments of Saanich Inlet, British Columbia. Rate profiles had a definite maximum at 15 cm which corresponded to previously observed subsurface local maxima in sulfate reduction rate. The data clearly indicate that anaerobic methane oxidation was occurring at the base of the sulfate reduction zone in these sediments. Furthermore, the coincidence of maxima in the methane oxidation rate and the sulfate reduction rate strongly suggests that the methane oxidizing agent was sulfate, either via direct reaction or coupled indirectly through reactions with other substrates.

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