Studies of algocenoses are timely as the biomonitoring data show the ecological state of water basins and can be used аor planning and taking actions to protect environment. The objective of our research was to study water bodies of different origins in Volgograd region and to identify the peculiarities of their algocenoses. The article deals with water bodies of different origins in Volgograd area i.e. full-system pond fish farm «Flora» (pond № 1, pond № 5, pond № 7); Biruchiy Bay of Volgograd reservoir; artificially created wetland, which has no connection to the reservoir. There have been identified similarities in algocenoses compositions. It was found that phytoplankton biomass in the researched objects gradually increases since April reaching its peak in August, then it gradually decreases and by the end of October is minimumal.The average phytoplankton biomass in the studied points ranged from 0.7644 to 2.7882 mg/L in spring , from 3.5923 to 53.9616 mg/L in the summer and from 3.5870 to 10.2592 mg/L in autumn. There was a positive corelation between the level of biomass and chlorophyll a in the tested water samples. It was revealed that Diatomeae, Chlorophyta and Cyanobacteria were the basis of phytoplankton species composition in ecosystems of the studied objects. 46 species and subspecies were discovered in phytoplankton composition and the dominant algae taxa were identified i.e. Diatomeae - Aulacoseira granulata , Nitzschia angustata , Chlorophyta - Chlorella vulgaris, Pandorina morum and Cyanobacteria - Microcystis aeruginosa, Anabaena contorta . It was determined that the ratio of different types of algae taxa was approximately the same throughout the study period, and the coefficient of species similarity of phytoplankton communities was rather high - its fluctuations were from 0.6 to 0.86.
biologicheskiy monitoring, fitoplankton, al'gocenoz, hlorofill, biomassa, al'gomonitoring
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