Hidrobionts communities state in the waters of Temryuk-Achtarsk licence site in conditions of the environment factors
It is stated that during summer of 2016 the biota of Temryuk-Akhtarsk license site developed under specific conditions caused by extremely high salinity, heavy oxygen regime, disbalanced ratio of biogenic elements concentrations, predominance of oxidation processes. The bacterial community change was observed, abundance and biomass of cells in water and bottom sediments was higher than the average one for many years, rod-shaped forms predominated in the near-bottom waters and bottom sediments. Phytoplankton species diversity reduced and its composition changed. Diatoms and Dinophyta algae predominated. The differences in the phytoplankton of the offshore and coastal zones as well as a great number of the Black sea species in the community are shown. Zooplankton diversity was poor, including only 17 species, meroplankton was a dominant and Cladocera was absent. There was bloom of Ctenophora mnemiopsis. 28 species were fixed in the benthos community. Dominant animals were small-sized and resistant to the lack of oxygen. The recorded changes of biota state are caused by a set of natural factors but not by the activities of LLC «NK «Priazovneft» in the Azov Sea waters.