Abstract—
Preliminary microbiological investigation of the Barguzin Valley terrestrial hydrotherms did not elucidate the composition of the community of sulfate-reducing prokaryotes (SRP) responsible for high sulfide concentrations in the Kuchiger and Umkhei springs. Measurement of sulfate reduction rate (SRR) with labeled sulfate in the samples collected together with those for determination of community composition by 16S rRNA gene profiling revealed that, while not numerous, the SRP consisting of Desulfobacterota and Thermodesulfovibrio was responsible for a highly active process. SRR in the sediments of the Umkhei and Kuchiger springs was up to 12.7 ± 0.2 and 2.05 ± 0.08 mg S dm–3 day–1, respectively.
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Funding
Sampling, determination of the physicochemical parameters, and measurement of sulfate reduction rates were supported by the Russian Science Foundation, grant no. 21-14-00114, OVK). Molecular analysis of the community was supported by the Russian Science Foundation, grant no. 22-14-00178, NVR).
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IIR, experiments for SRR determination, preparation of the manuscript; VVK, sampling and 16S rRNA gene sequencing; APL, sampling and determination of the physicochemical parameters, preparation of the article; LOS, preparation of the article; EVD, sampling; NVR, sampling and analysis of the results of the 16S rRNA gene sequencing; OVK, sampling and preparation of the article.
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Translated by P. Sigalevich
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Rusanov, I.I., Kadnikov, V.V., Lukina, A.P. et al. Low-Abundance Sulfidogenic Bacteria Carry out Intensive Sulfate Reduction in Terrestrial Hydrotherms of the Barguzin Valley. Microbiology 92 (Suppl 1), S29–S32 (2023). https://doi.org/10.1134/S0026261723603603
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DOI: https://doi.org/10.1134/S0026261723603603