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Microbial sulfate reduction in a brackish meromictic steppe lake
Kosolapov, D.B.; Rogozin, D.Y.; Gladchenko, I.A.; Kopylov, A.I.; Zakharova, E.E. (2003). Microbial sulfate reduction in a brackish meromictic steppe lake. Aquat. Ecol. 37(3): 215-226
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

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Keywords
    Anaerobic respiration; Anoxic basins; Brackish water; Meromictic lakes; Nearshore sedimentation; Sulphate reduction; Russia, Siberia, Shira L. [Marine Regions]; Brackish water; Fresh water

Authors  Top 
  • Kosolapov, D.B.
  • Rogozin, D.Y.
  • Gladchenko, I.A.
  • Kopylov, A.I.
  • Zakharova, E.E.

Abstract
    Patterns of sulfate reduction were studied in water and sediments of Lake Shira, South Siberia, Russia. The lake was characterized by a high level of sulfate (91-116 mM). The concentration of hydrogen sulfide in the anoxic waters of the lake reached 0.6 mM. In summer the sulfate reduction rate in the water column, measured by radiometric technique, varied from 0.25 to 9.81 µmol sulfate l-1 d-1. There were two peaks of sulfate reduction activity: just below the chemocline and near the sediment surface. Sulfate reduction rate in the profundal silts ranged from 4.1 to 90.6 µmol l-1 d-1. The zone of the most active sulfate reduction was restricted to the surface sediment layers. The acceleration of sulfate reduction rate (up to 236 µmol l-1 d-1) and the increase of density of viable sulfate reducers (up to 2 x 105 cells ml-1) were recorded in the littoral sediments adjacent to the mouth of the Son River and sewage discharge. It was apparently caused by the input of allochthonous organic substrates and also by a high environmental temperature. On an areal basis, sulfate reduction rate in the water was approximately 8 times higher than that in the profundal sediments. Sulfate reduction was the most important process of anaerobic oxidation of organic carbon in Lake Shira. In summer in the profundal zone of the lake, sulfate reducers were able to mineralize about 67% of the daily integrated primary production of phototrophic and chemotrophic organisms.

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