Based on the fact that, a standard prey-predator model (SPPM), exhibits
irreversible phase transitions, belonging to the universality class of
directed percolation (DP), between prey-predator coexistence and predator
extinction [Phys. Lett. A 280 (2001) 45], a self-organized prey-predator
model (SOPPM) is formulated and studied by means of extensive Monte Carlo
simulations. The SOPPM is achieved defining the parameters of the SPPM as
functions of the density of species. It is shown that the SOPPM
self-organizes into an active state close the absorbing phase of the SPPM,
and consequently their avalanche exponents also belong the the universality
class of DP.
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