IX-th International Conference of Zoologists, 12-13 October 2016 227 TROPHICITY ASSESSMENT OF THE DNIESTER RIVER BASED ON MICROBIOLOGICAL PARAMETERS Igor Subernetkii, Maria Negru, Olga Jurminskaia Institute of Zoology, Academy of Sciences of Moldova, Chisinau, Republic of Moldova email:
[email protected] The study of the microbiological parameters of bacterioplankton in different types of aquatic ecosystems is one of the mail directions in the applied researches. Water samples were collected seasonally during 2015 at 11 stations of the Dniester River and Dubossary reservoir: Naslavcea, Valcinet, Soroca, Camenca (medial sector of the river - 12 samples), Erjovo, Goiani, Cocieri (Dubossary reservoir - 9 samples), Vadul lui Voda, Varnita, Suclea, Palanca (lower sector of the Dniester River - 12 samples). The trophic category of moni- tored ecosystems was appreciated based on such microbiological parameters as bacterial production and destruction, total number of bacteria, number of saprophytes and some physiological groups of micro organisms involved in cycles of nitrogen, phosphorus and carbon. Sampling and analysis of water samples was carried out by methods accepted in hydrobiology (Gak, 1975; Ambrazene, 1984; Kopylov and Kosolapov, 2008; Water Quality Monitoring and assessment of ecological status of aquatic ecosystems, 2015 etc.). The following results were obtained: - A large range of values has been revealed for such microbiological parameters as total number of bacteria (Ntot – from 0.6 to 8.0 million cells / ml) and number of saprophytes (Nsapr – from 0.1 to 62.0 thousand cells / ml). Under the investigated period, the highest values of these parameters were recorded for two stations of the Dniester River (Fig. 1): Fig.1.