Abstract
ABSTRACT Trophic state indices (TSIs) have been widely used to rank and classify lakes. Applications and limitations of TSIs are discussed, and types of TSIs developed previously are reviewed. An index is a summary statistic, and most trophic indices have been multivariate metrics, reflecting the complexity of the concept of trophic state. A recently developed TSI scheme for Florida lakes is described. This index includes sub-indices for the major physical, chemical, and biological indicators of trophic conditions (Secchi disk transparency, total P and N concentrations, and chlorophyll a levels), which were developed from a data base of 313 lakes. Use of the index to rank Florida lakes and evaluate problem lakes is described.
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