selection of initial values of the biomass of the elements. 

 The system of equations of the model is as follows: 



41= - al (1.13) 



dz 



f = - hPp * «d * n I R, . K |j . 6 |1 



i = p]^,b]^,f ...f4, S;^...S4 (1.14) 



dz' 



^ = aPp - Rp - pp - 1 Cpi + K — I - 0)1 ^ 



(1.15) 



(1.16) 



j = P]^,b]^,d^,fi. ..f4,S]^,S2 j = f2...^4» S1...S3 (1.17) 



^ = 1 (Hi + wiXi) - ). Cdi + K -^ - 0)3 ^ 



i = fi...fi,Si...S3 i = fi...f4, (1.18) 



where ri is the coefficient of nutrient release in the process of 

 metabolism, as a fraction of the utilization of nutrients in metabolism 

 (n = 0.05); C^ ^ is the specific ration of the ith food consumer 

 represented by the jth food source; u is the natural mortality 

 coefficient; X^ is the biomass of the ith zooplankton element (i = f^, 

 ^2' ^3» ^4' ^1» ^2> ^3)' ^i is the nonassimilated food of the ith 

 zooplankton element. 



H. = (1 - u^) I Cji 

 j = p, b, d, f, s. 



The remaining symbols are explained above or are analogous to the 

 symbols used in the model of A. A. Lyapunov (equations 1.2-1.7). 



329 



