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The Krka River is a pristine karstic stream and unique model system for the understanding and interpretation of environmental records in tufa precipitating rivers worldwide. The river is characterized by 7 main and numerous small tufa barriers grown in a constant and dynamic process depending upon many physicochemical factors. An evaluation of the quality status of the pristine karstic, tufa depositing aquatic environment of the Krka River National Park based on the analysis of mercury contents was performed for t...

Bottom sediments are a specific component of aquatic ecosystems. They are actively involved in the accumulation, redistribution and mass transfer of chemical elements, including heavy metals. They can contribute to the purification of the water column, due to its depositing properties. However, they can also serve as a source of secondary pollution, as a result of the transition of pollutants into the suspended matter. The intensity of accumulation and migration of substances is directly dependent on the lithologi...

The Don River Delta represent a single hydrographic system, the development of which is characterized by the spatial-temporal variability. The functional role of the individual delta channels and their participation in the distribution of the river flow are different due to significantly different morphological characteristics and stages of development. In turn, this is reflected in the peculiarities of hydrological and hydrochemical processes. In this regard, within the delta the intensity of migration of chemica...