Cosmopolitan freshwater bacteria in microbial communities of recreational freshwaters in Baikal region

Abstract

In the present study, three recreational freshwater lakes were analyzed covering a wide range of physical and chemical conditions resulting in distinct bacterioplankton community compositions. The bacterial diversity identified in three freshwater lakes further extends the presence and dominance of widely distributed few bacterial groups previously detected in freshwater lakes. The samples were quantitatively dominated by
(13.7 54.9%), Gammaproteobacteria (17.7 59.8%), Actinobacteria (6.7 27.9%), Alphaproteobacteria (2.3 16.3%), Cyanobacteria (0.6 30.3%) and Verrucomicrobia (2.4 6.5%), which is typical for freshwater environments. In our study, we examined the recovery of cosmopolitan freshwater bacterial groups according to physical and chemical properties of water in lakes. The distribution of some common freshwater taxa, which can act as indicator organisms and reflect any changes in the ecosystem caused by climatogenic and anthropogenic impact, was investigated. We observed the significant community distinction between the environments with high anthropogenic impact and samples without significant differences among three lakes environmental conditions.