Photosynthetic apparatus variability of the rigid hornwort (Ceratophyllum demersum L.) from the Saksagan River influenced by the mine activity

Aquatic ecosystems are the final absorbers of various pollutants, so require complex monitoring to control their condition. Macrophytes and other aquatic plants serve as reliable indicators hydro ecological state, they provide an integral assessment environment in time space. Changes chlorophyll a b content ratio rigid hornwort (Ceratophyllum demersum L.) leaves depending on water chemical parameters Saksagan River zones influence "Ternivska" "Oktyabrska" mines (Kryvyi Rih city) were studied. The purpose work was find out features C. photosynthetic apparatus reorganization adaptive reaction technogenic transformation river ecosystem. mineralization changes range 1.2–2.9 g/L fluctuations nitrates nitrites different sections established. Both increase decrease both forms detected, but more significant related content. pigments total plant highest most mineralized areas (points return discharge 500 m below mine), it lowest due sharp increasing (500 mine). Significant variability indicates flexible regulation synthesis maintain efficiency under conditions pollution. revealed regularities indicate active protection process leaves, which is important prerequisite for plant’s survival adverse preservation structure productivity ecosystem River.