The analysis of spatio-temporal features of microbiological and hydrochemical indicators of the rivers within Surgutsky and Oktyabrsky Districts in Khanty-Mansi Autonomous Okrug – Yugra

The study of the environmental situation in river basins, including the assessment of actual water pollution, has recently become relevant. Water bodies located within the borders of oil production territories are experiencing constant and intense anthropogenic impact, which occurs not only during the operation of fields, but also during the preparation of areas for exploration and production drilling, construction of multi-well pads, communications, etc. This paper analyzes peculiarities of microbiological and hydrochemical indicators distribution of the rivers within Surgutsky and Oktyabrsky Districts in Khanty-Mansi Autonomous Okrug – Yugra. The cluster analysis method determines cascade systems based on the total microbial number of the studied rivers. The characteristics of the generic composition and distribution of the identified microorganisms are given. As a result of the cluster analysis, it was revealed that organoheterotrophic microflora is found mainly in the studied rivers. 16 bacterial cultures and 3 cultures from the mycelial microflora were identified among the isolated microorganisms. The paper also presents the results of rivers monitoring in 2018–2019 on the following water quality indicators: pH, ammonium ions and acute toxicity. The time variability of hydrochemical indicators correlates with different phases of the hydrological regime of rivers.