1976) or vertical nonuniformities in the distribution of plankton 

 (Vinogradov et al., 1972; and others). 



Another, basically different, type of model is the analytic model, 

 used for qualitative analysis of the general characteristics of 

 ecosystems related to estimates of their variety, stability, etc. 



In what follows, we shall analyze several approaches to the 

 modelling of marine ecosystems and their components. 



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