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The stone crayfish (Austropotamobius torrentium Schrank) is one of thetwo native crayfish species in the Czech Republic. The populations as well as physical andchemical parameters of water (pH, conductivity, dissolved oxygen, undissolved particles,NH3, NH4+, NO2−,NO3−, phosphorus, Ca2+ andSO42 − ) of 33 streams were examined to find the ecologicalplasticity of this crayfish and some relations between these parameters and populationdensities. The mentioned parameters often significantly varied at the sites. Twoapproaches were applied to find relations between these parameters and observed abundance.At first, the observed streams were compared using RDA (streams  ×  physical-chemicalparameters). No significance was found while testing relationship between the streamsgrouped along the 1st axis of model and the observed abundances of stone crayfish.However, some correlations between abundance and conductivity, calcium, nitrates andsulphates were found using polynomial regression. These relationships are explicable interms of mutual correlations, underlying geology and other factors which affectabundances. In conclusion, A. torrentium is able to inhabit waters with alarge range of physical and chemical parameters of the water without any fundamentalinfluence on population densities. Water properties play an indisputable role as limitingecological factors at uncommon concentrations, but population densities are probablyinfluenced much more by the types of habitats, habitat features, predation and otherecological factors

Stone crayfish in the Czech Republic: how does its population density depend on basic chemical and physical properties of water?