Redundancy analysis (RDA) biplots of both abiotic and biotic environmental parameters and (a) particular taxonomic groups of epiphytic algae, including classes of diatoms, and (b) samples collected in particular lakes and seasons. Bolded arrow indicate significant variable (based on Monte Carlo permutation test), that influenced on epiphyton composition. Temp. − temperature, Trans. − transparency, Cond. − conductivity, Ph. chl-a − phytoplankton chl-a, O₂ – oxygen, N–NH₄ – ammonium nitrogen, N–NO₃ – nitrate nitrogen, DIN/DIP − ratio of dissolved inorganic nitrogen to dissolved inorganic phosphorus, TOC − total organic carbon, WLF − the frequency of water level fluctuations; Centr. − Centrales, Frag. − Fragilariaceae, Eun. − Eunotiaceae, Bac. − Bacillariaceae, Epith. − Epithemiaceae, Sur. − Surirellaceae, Nav. − Naviculaceae, Achn. − Achnanthaceae, Cyan. − Cyanobacteria, Chrys. − Chrysophyceae, Euglen. − Euglenophyceae, Dinoph. − Dinophyceae, Chlor. − Chlorophyceae, Ulvoph. − Ulvophyceae, Zygn. − Zygnematophyceae, Fil. Chlor. − Filamentous Chlorophyta, littoral cladocerans: Acroperus − Acroperus, Alona − Alona, Alonella −Alonella, Graptole − Graptoleberis, Pleuroxu − Pleuroxus, Pseudoch − Pseudochydorus, Sida − Sida; fish: A. albur − Alburnus alburnus, P. fluvi − Perca fluviatilis, R. rutil − Rutilus rutilus, S. eryth − Scardinius erythrophthalmus; samples (examples): S − Skomielno, C − Czarne Sosn, T − Tomaszne, K − Krzczeń, s − spring (April), sr − summer (July), a − autumn (October).