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Marine Biology

, Volume 41, Issue 1, pp 7–17 | Cite as

Bacterial sulfate reduction within reduced microniches of oxidized marine sediments

  • B. B. Jørgensen
Article

Abstract

Bacterial sulfate reduction was demonstrated in the oxidized surface layers of a coastal marine sediment using a radiotracer technique. The obligate anaerobic process takes place within reduced sediment pellets of 50 to 200 μm diameter. The H2S produced diffuses out into the interstitial solution and is oxidized before any detectable accumulation takes place. This microniche structure explains the presence of sulfate-reducing (Desulfovibrio spp.) and sulfide oxidizing (Beggiatoa spp.) bacteria and of ferrous sulfide and pyrite in the oxidized sediment. Sulfate reduction was also demonstrated within detrital particles experimentally decomposed in oxic seawater or sediment. The limiting conditions for the maintenance of a reduced microniche within an oxic environment is discussed in terms of a theoretical model.

Keywords

Sulfide Pyrite Marine Sediment Sulfate Reduction Desulfovibrio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • B. B. Jørgensen
    • 1
  1. 1.Institute of Ecology and GeneticsUniversity of AarhusAarhusDenmark

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