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Values of rarefied species richness with standard deviation (sample rarefaction with Mao Tau estimation) for groups of sites differed in terms of biocoenotic type (IV − a, b; V − c, d; VI − e, f), method of quality assessment (BMWPpl and MMI) and values of environmental quality (white circles − low, triangles − moderate, black circles − high). Values of fit accuracy of logarithmic regression curves are presented as R2. Differences in richness between sites with moderate and extreme values presented on plots (a)–(d) are statistically significant (Kolmogorov–Smirnov's test).
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