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[Microbiologic processes in meromictic Lake Sakovo].

V M Gorlenko, E N Chebotarev

    Mikrobiologiia
    |January 1, 1981
    PubMed
    Summary

    Lake Sakovo

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    Area of Science:

    • Limnology
    • Microbial Ecology
    • Biogeochemistry

    Background:

    • Lake Sakovo is a freshwater meromictic lake with high sulfate concentrations.
    • Bacterial sulfate reduction is limited by organic substrate deficiency.
    • Hydrogen sulfide (H2S) is present in the monimolimnion, coinciding with the thermocline and chemocline.

    Purpose of the Study:

    • Investigate the microbial communities and biogeochemical processes in Lake Sakovo.
    • Determine the role of sulfur bacteria in the lake's ecosystem.
    • Quantify the production and oxidation of hydrogen sulfide.

    Main Methods:

    • Field sampling and chemical analysis of water and sediments.
    • Microbial cell counts and identification of bacterial species.
    • Measurement of sulfate reduction rates and carbon assimilation.

    Main Results:

    • High sulfate concentrations (up to 816 mg/l) were observed, but sulfate reduction rates were low.
    • Green sulfur bacteria (Pelodictyon luteolum, Chlorobium aggregatum) were abundant in the H2S zone.
    • Significant carbon assimilation by phototrophic and chemosynthetic bacteria occurred.
    • High rates of H2S production in sediments and oxidation by sulfur bacteria were calculated.

    Conclusions:

    • Organic substrate limitation restricts bacterial sulfate reduction in Lake Sakovo.
    • Sulfur bacteria play a crucial role in the lake's sulfur cycle, utilizing H2S produced in sediments.
    • Syntrophism and diffusion likely supply sulfide to sulfur bacteria.

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