Abstract
A biological evaluation of an aquatic environment based upon the rate of replaceability of the biocoenosis can be achieved by the separate estimation of the parameters trophism, saprobity, and diversity (SCHROEVERS, 1973). In those cases where the trophic and saprobic degrees are determined by an analysis of the composition of the phytoplankton, mostly the indicative value of the Desmidiaceae is used. It is emphasized that the often undiscriminating application of this parameter in practice can easily lead to unwarranted conclusions. An alternative approach in which the ecological differentiation within this group of algae is better accounted for, is proposed in the form of a (simple) typology of communities of desmids to be used as a direct basis of a biological rating.
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