A cryptic sulfur cycle in oxygen-minimum-zone waters off the Chilean Coast

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  • Donald Eugene Canfield, Syddansk Universitet, Denmark
  • Frank J Stewart, Massachusetts Institute of Technology, United States
  • Bo Thamdrup, Denmark
  • Loreto De Brabandere, Denmark
  • Tage Dalsgaard, Denmark
  • Edward F Delong, Massachusetts Institute of Technology, United States
  • Niels Peter Revsbech
  • Osvaldo Ulloa, Universidad de Concepción, Chile
  • Department of Marine Ecology
  • Interdisciplinary Nanoscience Center
  • Department of Biological Sciences, Microbiology
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.
Original languageEnglish
Pages (from-to)1375-1378
Publication statusPublished - 2010

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