Abstract
The present work covers a distribution of thionic (TB), denitrifying (DNB) and sulfate reducing (SRB) groups of bacteria inhabiting the bottom sediments of the coastal water area of Sevastopol (Black Sea), depending on the redox conditions and depth. Sampling and subsequent treatment of the material were conducted using standard methods of hydrobiology and general microbiology. The studied groups of bacteria are isolated from bottom sediments with different indicators of redox potential (ORP) Eh: from 
 + 356 to -189 (mV). A negative correlation was found between the ORP value and the number of bacteria analyzed. The correlation coefficient for SRB was r = - 0.5, for TB and DNB, respectively, r = - 0.47 and -0.51 (P <0.05). There is no reliable relationship between the pH values of the medium and the number of microorganisms observed. A high number of thionic and sulfate reducing bacteria was detected at the designated depth range: from 1 to 20 m. The greatest number of denitrifying bacteria was more often observed at depths from 1 to 10 m. It is determined that the restorative environmental conditions characterizing the majority of bottom sediments in the water area under consideration contribute to the development of the analyzed groups of bacteria, and their number increases with decreasing depth.
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