A − average score per taxon (ASPT; consistent with the scoring scale of BMWP_PL after Klimaszyk and Trawiński, 2007); B − log10 of the sum of individuals from selected families: Heptageniidae, Ephemeridae, Leptophlebiidae, Brachycentridae, Goeridae, Polycentropodidae, Limnephilidae, Odontoceridae, Dolichopodidae, Stratiomyidae, Dixidae, Empididae, Athericidae, Nemouridae +1, C − 1–GOLD% = 1–(frequency, i.e. % of the number of individuals from group of families Gastropoda + Oligochaeta + Diptera); D − the number of all families found in a given sampling location; E − number of organisms in orders: Ephemeroptera, Plecoptera and Trichoptera) found in a given sampling location; F − Shannon-Wiener diversity index. Solid line within the boxes represent average value. Box covers 25-75 percentiles of the parameter values distribution. Whiskers stand for 5-95 percentiles of the parameter values distribution.