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Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan
- Source :
- Environmental Microbiology Reports, Kérwá, Universidad de Costa Rica, instacron:UCR
- Publication Year :
- 2021
- Publisher :
- Wiley, 2021.
-
Abstract
- In this study, we explored the diversity and community composition of bacteria along a vertical gradient in Lake Issyk Kul, Kyrgyzstan, one of the largest and deepest brackish lakes in in the world. We identified 4904 bacterial ASVs based on analysis of 16S rRNA gene sequences and determined significant changes in the composition responding mainly to the variables depth and salinity. A higher abundance of Proteobacteria and Bacteroidetes was observed in the surface waters and the lake tributaries. Cyanobacteria were more abundant in the deep chlorophyll maximum (28.5 to 128 m), while Planctomycetes and Chloroflexi were dominant at depths between 128 to 600 m. According to our machine learning analysis used for identifying the most critical environmental factors, depth and temperature revealed the strongest effect on members of Proteobacteria, Planctomycetes, and Chloroflexi, while oxygen is associated with the variations in Cyanobacteria. Also, a notable increase in alpha diversity estimations was observed with increasing water depth. This work evidences significant differences in the structure of bacterial communities along the depth gradient in deep, transparent lake ecosystems. Notably, there is a dominance of Planctomycetes and Chloroflexi in the deepest layers, which can only be seen in a few other lakes with similar characteristics as Lake Issyk Kul and raises questions about their ecological role.
- Subjects :
- Cyanobacteria
03 medical and health sciences
RNA, Ribosomal, 16S
Dominance (ecology)
14. Life underwater
Kyrgyzstan
Ecology, Evolution, Behavior and Systematics
030304 developmental biology
0303 health sciences
Deep chlorophyll maximum
Bacteria
Brackish water
biology
030306 microbiology
Ecology
Microbiota
Lake ecosystem
Planctomycetes
biology.organism_classification
Agricultural and Biological Sciences (miscellaneous)
6. Clean water
Salinity
Lakes
Chloroflexi (class)
Environmental science
Alpha diversity
Proteobacteria
Subjects
Details
- ISSN :
- 17582229
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Environmental Microbiology Reports
- Accession number :
- edsair.doi.dedup.....87fbcdd21d1d5fb662c6874eada7d654
- Full Text :
- https://doi.org/10.1111/1758-2229.12935