Abstract
A mathematical model based on average long-term data on water temperature, illumination, transparency, and nutrient content is used to calculate annual variations in the concentrations of organic and inorganic fractions of nutrients (C, N, Si, and P) in ten water areas in the Caspian Sea. The eutrophication of sea environment is examined with special emphasis on the increase in the biomass of aquatic animals (in particular, phyto- and zooplankton), the rate and duration of periods of plankton blooming, and changes in the conditions of nutrient limiting of primary production processes in different parts of the sea. Relationships between the inorganic components of N and P in river runoff and sea water areas are established. The obtained Nmin/DIP ratios show P primary production to be limited in the zone of influence of the Volga runoff, P and N primary production to be limited in other northern parts of the sea, and N primary production to be mainly limited in the middle and southern parts of the sea.
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