ENVIRONMENTAL ANALYSIS OF THE ALGOFLORA OF THE MIDDLE CURRENT ZARAFSHAN RIVER

The algoflora of the Zarafshan River was formed due to the complex influence of environmental factors. The river is divided into 3 parts and these parts differ by a number of environmental factors such as the chemical composition of water, water temperature, transparency, flow rate, pH, etc. The algoflora of the river is identified by 331 species and intraspecific taxon. Algae groups were analyzed in relation to water temperature and salinity, as well as to habitat type. Water temperature plays a decisive role in the distribution and development of algae. In spring, 169 algae taxa were identified in algae, 210 in summer, 13 in autumn and 88 in winter. There are 16 eurythermal and 315 stenothermal algae species in the river algoflora. Water salinity varies from beta-oligohaline to alpha-oligohaline. The river waters are mainly freshwater and, to a lesser extent, in some places, freshwater. This ensures the distribution of freshwater algae in the middle and lower parts of the river. Algocenoses are distributed as follows: phytoplankton - 62, phytobenthos - 134, phytoplankton-phytobenthos - 66, periphyton - 62 and epiphyton - 7 species. There are 97 species and varieties of saprobic-indicator algae in the river algoflora; with the help of these species the ecological and sanitary condition of the river is determined. Indicator-saprobic algae are distributed unevenly by seasons of the year.