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The cascade water system of the Azov Sea basin is a set of geochemical barriers. Here, water masses of different mineralization mix, and the hydrological and hydrodynamic conditions change. As a result, there is a sharp change in the physical, chemical, and biogeochemical characteristics of all components of the aquatic ecosystem, including bottom sediments. Bottom sediments are a more conservative component of the aquatic landscape in comparison with the water mass. The content of pollutants in the samples taken ...

The article presents the data obtained by the authors during the expedition research in the largest bay of the Azov Sea - the Taganrog Bay. Its characteristic feature is shallowness, flowing due to water exchange with the Don, small rivers, and the development of surge phenomena. The ecosystem of the bay has been experiencing strong anthropogenic pressure for several decades. The authors analyzed the behavior and distribution of mercury dissolved and suspended forms in the surface and bottom layers of water, depen...