RT Journal Article ID 3745d0450ef4feb1 A1 Melenchuk, G. V. T1 Quantitative and production indices of phytoplankton as characteristics of aquatic ecosystem status JF International Journal on Algae JO IJA YR 1999 FD 1999-06-01 VO 1 IS 3 SP 40 OP 51 AB Gradations of values of phytoplankton numbers, biomass and primary production corresponding to 5 classes (9 categories) of water quality with regard to trophic levels and saprobic zones are presented. On the example of lakes with different trophic levels, indicative significance of those indices is discussed. Their application in evaluating aquatic ecosystem status and water quality is described. PB Begell House LK https://www.dl.begellhouse.com/journals/7dd4467e7de5b7ef,225be7ab43caa3bf,3745d0450ef4feb1.html