Microbial life in Bourlyashchy, the hottest thermal pool of Uzon Caldera, Kamchatka

Extremophiles : Life Under Extreme Conditions
Nikolay A ChernyhElizaveta A Bonch-Osmolovskaya

Abstract

Bourlyashchy is the largest and hottest pool in the Uzon Caldera, located in the territory of Kronotsky Nature Reserve, Kamchatka, Russia, with sediment surface temperatures at the margins ranging from 86 to 97 °C, and pH from 6.0 to 7.0. The microbial communities of the pool water and sediments were studied comprehensively from 2005 to 2014. Radioisotopic tracer studies revealed the processes of inorganic carbon assimilation, sulfate reduction, lithotrophic methanogenesis and potentially very active process of acetate oxidation to CO2. The total number of microbial cells in water was different in different years ranging from 5.2 to 7.0 × 10(6); in sediments, it changed from year to year between 6.3 × 10(6) and 1.75 × 10(8), increasing with a decrease in temperature. FISH with Archaea- and Bacteria-specific probes showed that the share of Bacteria differed with year, changing from 34 to 71%. According to 16S rRNA gene pyrosequencing data, lithoautotrophs (Aquificales and Thermoproteales) predominated in water samples, while in sediments they shared the niche with organotrophic Crenarchaeota, Korarchaeota, and bacteria of the genus Caldimicrobium (phylum Thermodesulfobacteria). The majority of organisms in water belonged to cult...Continue Reading

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Citations

Jan 24, 2016·International Journal of Systematic and Evolutionary Microbiology·Tatiana V KochetkovaAnna A Perevalova
Dec 29, 2016·Extremophiles : Life Under Extreme Conditions·Alexander Yu MerkelElizaveta A Bonch-Osmolovskaya
Feb 16, 2019·Environmental Microbiology Reports·Emily St JohnAnna-Louise Reysenbach
Sep 26, 2020·Journal of Clinical Medicine·Sara CacciapuotiGabriella Fabbrocini
Mar 8, 2017·Frontiers in Microbiology·Ilya V KublanovElizaveta A Bonch-Osmolovskaya
Aug 18, 2017·Antonie van Leeuwenhoek·Andrey V MardanovNikolai V Ravin
Nov 25, 2020·BMC Microbiology·Sergey E PeltekNikolay A Kolchanov
Nov 26, 2021·Microbes and Environments·Katsuhiro AsamatsuKatsunori Yanagawa

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