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Microbial methane oxidation in the River Saar.

U Zaiss, P Winter, H Kaltwasser

    Zeitschrift Fur Allgemeine Mikrobiologie
    |January 1, 1982
    PubMed
    Summary
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    Methane-oxidizing bacteria are more abundant at sediment surfaces in the River Saar. Most methane produced in sediment escapes to the atmosphere, with little methane oxidation occurring in the water phase.

    Area of Science:

    • Environmental microbiology
    • Aquatic chemistry
    • Biogeochemical cycles

    Background:

    • Methane is a potent greenhouse gas.
    • Understanding methane cycling in rivers is crucial for assessing aquatic contributions to atmospheric methane.
    • Methane-oxidizing bacteria play a key role in mitigating methane release from aquatic ecosystems.

    Purpose of the Study:

    • To investigate the distribution and activity of methane-oxidizing bacteria in the River Saar.
    • To determine the relationship between methane concentration and oxidation rates.
    • To quantify methane oxidation in the water phase relative to methane production in sediments.

    Main Methods:

    • Analysis of vertical and longitudinal profiles in the River Saar.
    • Enumeration of methane-oxidizing bacteria.

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  • Measurement of methane oxidation rates.
  • Laboratory experiments to simulate river conditions.

    • Main Results:

    • Methane-oxidizing bacteria were significantly more abundant (two orders of magnitude) at the sediment surface compared to the overlying water.
    • Methane oxidation rates were strongly correlated with methane concentration in both field and laboratory settings.
    • Only a small fraction (average 1.2%) of methane produced by methanogenic bacteria in the sediment was oxidized in the water phase, with most escaping to the atmosphere.

    Conclusions:

    • The sediment-water interface is a critical zone for methane oxidation in the River Saar.
    • The low oxidation efficiency in the water phase suggests significant methane flux from the river to the atmosphere.
    • Further research is needed to understand factors controlling methane oxidation and its overall impact on riverine methane emissions.