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There is a worldwide ecological problem of anthropogenic eutrophication. The problem is especially serious one for the ecosystems of lakes, water-storage basins, and closed seas, such as the Baltic Sea. The eastern part of the sea is the Neva Bay. The water area is totally located within the administrative border of St. Petersburg and is influenced by the megacity. There is monitoring of the total nitrogen and phosphorus inflow into the Neva Bay with water of the Neva River and its spill streams. Nevertheless, the...