A. V. Leonov and O. V. Chicherina
Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii pr. 36, Moscow, 117851 Russia
Received November 17, 2003
Abstract—A hydroecological model is used to study the transformations of biogenic-element (N,P, C, and Si)
compounds in different parts of the Caspian Sea. The existing notions of the biotransformation processes of
these compounds in the marine environment are formalized. The state of the marine environment is character-
ized based on calculated annual dynamics of biogenic element concentrations, their relationships, and internal
fluxes. Relationships between the concentrations of N and P mineral components are used to establish distinc-
tions between different parts of the sea in the conditions of primary production limited by biogenic elements,
as well as the development conditions of aquatic lifeforms (nutrient consumption, release of metabolic prod-
ucts, and detritus formation).
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