Variability of Microbial Communities in Two Long-Term Ice-Covered Freshwater Lakes in the Subarctic Region of Yakutia, Russia
| Autor: | Darya P. Petrova, Maria V. Bashenkhaeva, Artyom M. Marchenkov, Yulia R. Zakharova, Liubov Kopyrina, Yuri P. Galachyants, Irina V. Tomberg, Yelena V. Likhoshway |
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| Rok vydání: | 2021 |
| Předmět: |
Biogeochemical cycle
Ecology biology Microbiota Soil Science biology.organism_classification Cyanobacteria Subarctic climate Lakes Water column Habitat Microbial ecology Verrucomicrobia Abundance (ecology) RNA Ribosomal 16S Proteobacteria Humans Ice Cover human activities Ecology Evolution Behavior and Systematics Oxalobacteraceae |
| Zdroj: | Microbial ecology. 84(4) |
| ISSN: | 1432-184X |
| Popis: | Although under-ice microbial communities are subject to a cold environment, low concentrations of nutrients, and a lack of light, they nevertheless take an active part in biogeochemical cycles. However, we still lack an understanding of how high their diversity is and how these communities are distributed during the long-term ice-cover period. Here we assessed for the first time the composition and distribution of microbial communities during the ice-cover period in two subarctic lakes (Labynkyr and Vorota) located in the area of the lowest temperature in the Northern Hemisphere. The diversity distribution and abundance of main bacterial taxa, and the composition of microalgae, varied by time and habitat. The 16S rRNA gene sequencing method revealed, in general, a high diversity of bacterial communities where Proteobacteria (~59%) and Actinobacteria (~11%) prevailed. There were significant differences between the communities of the lakes: Chthoniobacteraceae, Moraxellaceae, and Pirellulaceae were abundant in Lake Labynkyr, while Cyanobacteria, Oligoflexales, Ilumatobacteraceae, and Methylacidiphilaceae were more abundant in Lake Vorota. The most abundant families were evenly distributed in April, May and June their contribution was different in different habitats. Moraxellaceae, Ilumatobacteraceae dominated in April in the water column, while Sphingomonadaceae dominated both in water column and on the ice bottom. In May, the number of Comamonadaceae increased and reached the maximum in June, while Cyanobacteria, Oxalobacteraceae and Pirellulaceae followed. We found a correlation of the structure of bacterial communities with snow thickness, рН, total nitrogen concentration, and conductivity. We isolated psychrophilic heterotrophic bacteria both from dominating and minor taxa of the communities studied. This allowed for specifying their ecological function in the under-ice communities. These findings will advance our knowledge of the under-ice microbial life. |
| Databáze: | OpenAIRE |
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