Summary:

Macrophyte indices, as like Mean Trophic Rank (MTR), Macrophyte Biological Index for Rivers (IBMR), River Macrophyte Nutrient Index (RMNI), Reference Index (RI) and other are successfully used in evaluation of river ecosystems. They based on tolerance of particular vascular plants, mosses, liverworts and macroalgea on water trophy. Studied part of Noteć River was situated above Gopło Lake and accept mine waters discharge from open-pit mine Tomisławice. In the year 2012 the analyses of the impact of brown coal mine waters on Noteć River trophy were carried out. Several macrophyte indices were used and supported by chemical analyses in selected sites. For all sites earlier data were accessible and were used to comparisons. On the base of obtained results it was concluded, that the impact of mine waters trophic characteristics on macrophyte indices and water trophy was generally negligible. It was due to the small differences of trophy between river and mine waters and lack of sensitivity of macrophyte indices on lack of individual indicator species from the group of aquatic vascular plants. Yellow Water-lily was the wasted species and significant decrease of cover was found for other species without changes of macrophyte indices values. It showed to some extent lack of sensitivity of macrophyte indices in detecting of slight changes of aquatic environment.