The paper presents an assessment of the ecological potential of the Soła river based on the benthic macroinvertebrates and diatomaceous phytobenthos, according to the principles of the Water Framework Directive. The calculated values of Multimetric Diatom Index (IO) indicated class II of ecological potential, while the Multimetric Macroinvertebrate Index (MMI_PL) − class III. The final classification of biological, physicochemical and hydromorphological elements showed that the examined section of the Soła river represents a moderate ecological potential which indicates a moderate disruption in the functioning of the water ecosystem as well as a violation of the hydrological regime and morphological conditions of the riverbed.
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