Production Characteristics of Phytoplankton as Indicators of the Trophic State of Artificial Reservoirs

General ideas about the trophicity of fresh waters, trophic scales, and trophic indices are consi-dered. An assessment of the trophic status of the Volga reservoirs is provided. Changes in the abiotic characteristics of the reservoirs and production–destruction indicators in waters of different trophies are considered.