Comparative study of physical-chemical variables of streams using multivariate analysis. Cushing, C. E. Archiv fuer Hydrobiologie, 1980.
Comparative study of physical-chemical variables of streams using multivariate analysis. [pdf]Paper  abstract   bibtex   
As a step toward the development of a system to categorize streams, 15 physical-chemical variables from 34 stream stations in North America and Europe were subjected to cluster and discriminant analyses to determine if discrete groupings were present, and, if so, which variables were most closely related to the among group variability. The log-transformed data provided five meaningful clusters of stream sites, but it was not possible to construct a simple and universally useful classification of running waters which includes physical, chemical, and biological aspects. Inclusion of biological variables is necessary to further assess the usefulness of the approach described here; work on this is in progress.

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