Simple model of self-organized biological evolution as completely   integrable dissipative system
  The Bak-Sneppen model of self-organized biological evolution of an infinite ecosystem of randomly interacting species is represented in terms of an infinite set of variables which can be considered as an analog to the set of integrals of motion of completely integrable system. Each of this variables remains to be constant but its influence on the evolution process is restricted in time and after definite moment its value is excluded from description of the system dynamics. 
Yu.M.Pis'mak (State University of Sankt-Petersburg)