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During the eutrophication of water bodies, a special role belongs to phosphorus as one of the most important nutrients necessary for the vital activity of all organisms. In water bodies, phosphorus is present in the form of inorganic and organic compounds. In the water of Lake Baikal, phosphorus in the form of phosphate ions is present in small amounts (5-15 μg/l) (Khodzher et al., 2017), because aquatic organisms rapidly use the soluble phosphorus compounds, or it has poorly soluble or insoluble forms that deposit. The bulk of its reserves has an organic form. Phytoand zooplankton are the main source of organic phosphorus in the Baikal water. A wide range of aquatic microorganisms can transform phosphorus compounds: mineralize, solubilize and immobilize (Gen-Fu and Xue-Ping, 2005; Hupfer et al., 2007). At present, there is no consensus on the species specificity of bacteria involved in the phosphorus cycle in nature. Many organotrophic microorganisms are capable of mobilizing phosphates. According to V.V. Parfenova, in the water and bottom sediments of Lake Baikal, the genera Pseudomonas, Micrococcus, Acinetobacter, Flavobacterium, and Bacillus represent the microorganisms of the phosphorus cycle (Parfenova and Ilyaletdinov, 1985). 2. Materials and methods

Identification of heterotrophic phosphate and silica solubilizing bacterial strains isolated from Lake Baikal