Features of microbial communities in fresh lakes of Buryatia

Abstract

The taxonomic composition of microbial communities of eight large fresh lakes of Buryatia was studied. These lakes are Baikal, Kotokel, Gusinoye, Shchuchye and lakes of the Eravno-Kharginskaya group (Isinga, Gunda, Sosnovoe, Bolshoe Eravnoe). They have water management, fishery and recreational significance. At the phylum level, the microbial communities of the studied lakes were similar but the phyla abundance was varied. They consisted of typical freshwater taxa Pseudomonadota, Actinobacteriota, Bacteroidota, Cyanobacteriota, Firmicutes, Planctomycetes and Verrucomicrobia. At the genus level, Acinetobacter and Pseudomonas were numerous in all lakes. Other dominant taxa were Flavobacterium, hgcI clade in the fresh lakes of the Baikal region and Exiguobacterium, Klebsiella in the Eravno-Kharginskaya lakes. The feature of Eravno-Kharginskie lakes was the abundance of the genera Exiguobacterium and Klebsiella, as well as the detection of sanitary-significant bacteria. These facts may indicate pollution as a result of pressing various factors, including anthropogenic ones.