BACTERIAL COMMUNITY OF PELAGIC ZONE AND SEDIMENTS OF THE NORTH CASPIAN SEA DURING 2015-2016 YEARS

Abstract. Aim. Microbial researches of water and sediment samples selected in summer period of 2105-2106 years in the North Caspian Sea water area as post-production monitoring (district of prospecting drilling) was made. Methods. Sampling realized according to conventional methods close to four water structures: Rakushecnaya, Sarmatskaya, Shirotnaya, Khvalynskaya. Proportions of saprotrophic, oil – and phenol oxidase and sulfate-reducing microorganisms defined in researched water and sediment samples, the total number of bacteria was also researched.  The value given to the quantity of water area for researched period: the coefficient Razumova, quality class and saprobity level of the studied water samples. Results. Studies had shown non-uniformly distribution of indicate groups’ microorganisms concentrations at the investigated structures’ points of the water area. Also the water monitoring had shown existence of very purify (xeno - and oligosaprobic) and dirty (poly - and hypercaprobic) zones in the Northern Caspian Sea’s water area. Main conclusions. However the population dynamics of the different microorganisms groups in summer period of 2015-2106 years near oil water fields attest to successful processes of self-purification of water area and recovering of water area ecosystem after human impact.

monitoring, microorganisms, North Caspian Sea, pelagic zone, sediments, numberosity

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