Journal
SCIENCE
Volume 330, Issue 6009, Pages 1375-1378Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1196889
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Funding
- Agouron Institute
- Danish National Research Foundation
- Gordon and Betty Moore Foundation
- Chilean Fondap Program
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Nitrogen cycling is normally thought to dominate the biogeochemistry and microbial ecology of oxygen-minimum zones in marine environments. Through a combination of molecular techniques and process rate measurements, we showed that both sulfate reduction and sulfide oxidation contribute to energy flux and elemental cycling in oxygen-free waters off the coast of northern Chile. These processes may have been overlooked because in nature, the sulfide produced by sulfate reduction immediately oxidizes back to sulfate. This cryptic sulfur cycle is linked to anammox and other nitrogen cycling processes, suggesting that it may influence biogeochemical cycling in the global ocean.
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