RT Journal Article ID 0ce3883117e15aa9 A1 Shchur, L. A. A1 Aponasenko, A. D. A1 Lopatin, V. N. A1 Filimonov, V. S. A1 Shepelevich, N. V. T1 Sanitary-ecological and Trophic Conditions of the Middle Reaches of the Yenisei River and its Tributaries JF Hydrobiological Journal JO HYD YR 1999 FD 1999-12-01 VO 35 IS 6 SP 113 OP 123 AB In summer periods 1989−1994, a complex of hydrobiological investigations in the middle reaches of the Yenisei river (Krasnoyarsk region) and its main tributaries were performed. Spatial distribution, quantitative, taxonomic characteristics of phytoplankton, bacterio- and phytoperiphyton, saprobicity indications, and production-destruction intensity were under study. Proceeding from these data, the waters in the Yenisei basin are classified as mesotrophic, corresponding to quality class 3 ('satisfactory pure'). PB Begell House LK https://www.dl.begellhouse.com/journals/38cb2223012b73f2,2752d83d4817479b,0ce3883117e15aa9.html