Spatiotemporal Changes in the Bacterial Community of the Meromictic Lake Uchum, Siberia
Autor: | Kshitij Tandon, Denis Yu. Rogozin, A. G. Degermendzhi, Sen-Lin Tang, Pei-Wen Chiang, Vladimir S. Zykov, Ya-Fan Chan |
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Rok vydání: | 2020 |
Předmět: |
0301 basic medicine
030106 microbiology Soil Science 03 medical and health sciences Purple sulfur bacteria Gammaproteobacteria Hydrogen Sulfide Relative species abundance Ecology Evolution Behavior and Systematics Bacteria Ecology biology Phototroph Sulfates Microbiota Alphaproteobacteria biology.organism_classification Anoxic waters Anoxygenic photosynthesis Oxygen Siberia Lakes 030104 developmental biology Seasons Proteobacteria Oxidation-Reduction Sulfur |
Zdroj: | Microbial Ecology. 81:357-369 |
ISSN: | 1432-184X 0095-3628 |
Popis: | Lake Uchum is a newly defined meromictic lake in Siberia with clear seasonal changes in its mixolimnion. This study characterized the temporal dynamics and vertical profile of bacterial communities in oxic and anoxic zones of the lake across all four seasons: October (autumn), March (winter), May (spring), and August (summer). Bacterial richness and diversity in the anoxic zone varied widely between time points. Proteobacteria was the dominant bacterial phylum throughout the oxic and anoxic zones across all four seasons. Alphaproteobacteria (Loktanella) and Gammaproteobacteria (Aliidiomarina) exhibited the highest abundance in the oxic and anoxic zone, respectively. Furthermore, there was a successional shift in sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria in the anoxic zone across the seasons. The most dominant SRB, Desulfonatronovibrio sp., is likely one of the main producers of hydrogen sulfide (H2S) and typically accumulates the most H2S in winter. The representative anoxygenic phototrophic bacterial group in Lake Uchum was purple sulfur bacteria (PSB). PSB were dominant (60.76%) in summer, but only had 0.2-1.5% relative abundance from autumn to spring. Multivariate analysis revealed that the abundance of these SRB and PSB correlated to the concentration of H2S in Lake Uchum. Taken together, this study provides insights into the relationships between changes in bacterial community and environmental features in Lake Uchum. |
Databáze: | OpenAIRE |
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