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PHYTOPLANKTON WATER QUALITY RELATIONSHIPS IN U. S. LAKES. PART VII: COMPARISON OF SOME NEW AND OLD INDICES AND MEASUREMENTS OF TROPHIC STATE
Citation:
Taylor, W., L. Williams, S. Hern, AND V. Lambou. PHYTOPLANKTON WATER QUALITY RELATIONSHIPS IN U. S. LAKES. PART VII: COMPARISON OF SOME NEW AND OLD INDICES AND MEASUREMENTS OF TROPHIC STATE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-79/079 (NTIS PB80153679), 1979.
Description:
Thirty-eight indices and measurements of trophic state were compared to evaluate their relative abilities to trophically rank a test set of 44 eastern and southeastern U.S. lakes, representing 17 states. Lake rankings based upon total phosphorus and chlorophyll a levels served as standards for evaluation of the indices by Spearman Rank Correlation procedures. The new phytoplankton community-based indices turned in 4 of the top 5 performances against the chlorophyll a standard, while Secchi disk transparency, phosphorus loading models, multivariate analyses, and total Kjeldahl nitrogen provided strong rank correlations with total phosphorus.