Nezbrytska I. Specifics of Chlorophyta and Cyanoprokaryota representatives functioning under conditions of increase in the aquatic environment temperature

Based on experimental and field research, the thesis reveals the patterns of changes in the intensity of growth, photosynthetic pigments content, activity of key enzymes of respiratory and nitrogen metabolism, as well as the state of pro- and antioxidant systems in Chlorophyta and Cyanoprokaryota species, widespread in the water-bodies of Ukraine, under conditions of elevated temperature of aquatic environment. It has been found that the response of various algae according to the parameters under study was species-specific and depended on their age and also on the temperature value (20, 26 и 32 and 38°C) and duration of exposure. It has been found, that the investigated species of Cyanoprokaryota, compared to Chlorophyta, are characterized by higher adaptive capacity to the elevated temperature due to significant lability of their metabolism and presence of additional water-soluble pigments - phycobiliproteins, which have strong antioxidant properties and make Cyanoprokaryota more resistant to stress abiotic factors.