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Bacterial communities of the microbial mats of Chokrak sulfide springs

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Abstract

This is the comparative investigation of the composition of phototrophic microbial mats developing in sulfide-rich saline Chokrak springs with outflow at the shore of the hypersaline lake Chokrak by means of next-generation sequencing. The springs are characterized by low temperature (~ 15 °C), near-neutral pH (6.7–8.5), and high-sulfide content. In the species composition the benthic microbial communities of Chokrak springs are similar to microbial mats of marine supralittoral and lagoons. Our results showed that salinity limitation had a significant effect on the species composition of benthic microbial communities developing at the outflow of the Chokrak springs. Predominant oxygenic phototrophs belonged to the genera Phormidium, Lyngbya, Leptolyngbya, Geitlerinema, and Arthrospira. Anoxygenic phototrophic bacteria were represented by halophilic green sulfur bacteria Prosthecochloris spp., halotolerant Chlorobaculum sp., as well as marine and extremely halophilic purple bacteria Roseospira, Rhodovibrio, and Halochromatium. Monoculture of a new species of halotolerant anoxygenic filamentous phototrophic bacteria was isolated.

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Acknowledgements

The authors are grateful to Samylina O.S. from Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences for her help in identification of cyanobacteria. This work was financially supported by the Presidium of the Russian Academy of Sciences via the program “Evolution of the Organic World and Planet-Scale Processes” (Subprogram 2), by the Russian Foundation for Basic Research (Project no. 19-04-00423) and the Ministry of Science and Higher Education of the Russian Federation. DNA sequencing was partially performed using the equipment of the Collective Use Center “Bioengineering” of the Federal Research Center of Biotechnology.

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Correspondence to Ekaterina I. Burganskaya.

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Communicated by Harald Huber.

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Burganskaya, E.I., Bryantseva, I.A., Krutkina, M.S. et al. Bacterial communities of the microbial mats of Chokrak sulfide springs. Arch Microbiol 201, 795–805 (2019). https://doi.org/10.1007/s00203-019-01648-6

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  • DOI: https://doi.org/10.1007/s00203-019-01648-6

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