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Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan

Authors :
Brayan Delgado-Duran
Georgiy Kirillin
Fabio Quesada-Perez
Peter O. Zavialov
Johana Akerman-Sanchez
Hans-Peter Grossart
Salmor Alymkulov
Lars Ganzert
Alex Araya-Lobo
Keilor Rojas-Jimenez
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.

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