Asymptotic properties of a stochastic chemostat model with two distributed delays and nonlinear perturbation

Abstract

In this paper, a stochastic chemostat model with two distributed delays and nonlinear perturbation is proposed. We first transform the stochastic model into an equivalent high-dimensional system. Then we prove the existence and uniqueness of global positive solution of the model. Based on Khasminskii's theory, we study the existence of a stationary distribution of the model by constructing a suitable stochastic Lyapunov function. Then we also establish sufficient conditions for the extinction of the plankton. Finally, numerical simulations are carried out to illustrate the theoretical results and to conclude our study, which shows that environmental noise experienced by limiting nutrient completely determines the persistence and extinction of the plankton.2010 Mathematics Subject Classification. Primary: 34F05, 92B05, 37H10; Secondary: 60J70. 2373 2374 XINGWANG YU AND SANLING YUAN 2376 XINGWANG YU AND SANLING YUAN becomes the following form: dN = D(N 0 − N ) − aU (N )P + bγ t −∞ K 1 (t − s)P (s)ds dt + σ 1 N dB 1 (t), dP = P − (γ + D) + c t −∞

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