Abstract

The biohydrochemical features of the Caspian Sea ecosystem were estimated for its ten water areas with the use of a mathematical model describing the transformation of compounds of organogenic elements (C, Si, N, and P) and taking into account the morphometric characteristics of the water areas and long-term mean monthly values of the major characteristics of the aquatic environment. Variations in the estimated concentrations of mineral and aggregated biogenic substance fractions, microorganism biomasses (heterotrophic bacteria, three phytoplankton groups and two zooplankton groups) in different water areas of the sea were analyzed. The formation conditions of microorganism biomasses in different water areas are characterized by the analysis of their bioproductivity estimates based on evaluated internal biogenic substance fluxes.

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