The oxidation of sulfide is equally important for the sulfur cycle as the reduction of sulfate. It is particularly important in coastal sediments because of the potential toxic effect of H2S to the benthic fauna or to fish. Sulfide inhibits cytochrome c oxidase in the mitochondrial respiratory chain and thereby blocks the production of ATP. Sulfide is therefore a serious environmental threat to the marine biota in coastal upwelling systems with high phytoplankton productivity or in basins with reduced water circulation where oxygen depletion does not ensure complete sulfide oxidation in the seabed (Diaz and Rosenberg, 1995...

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