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Zbl 1173.60020
Li, Xiaoyue; Jiang, Daqing; Mao, Xuerong
Population dynamical behavior of Lotka-Volterra system under regime switching.
(English)
[J] J. Comput. Appl. Math. 232, No. 2, 427-448 (2009). ISSN 0377-0427

Summary: We investigate a Lotka-Volterra system under regime switching $$dx(t) = \mathrm{diag}(x_1(t), \cdots , x_n(t))[(b(r(t)) + A(r(t))x(t))dt + \sigma (r(t))dB(t)]$$ where $B(t)$ is a standard Brownian motion. The aim here is to find out what happens under regime switching. We first obtain the sufficient conditions for the existence of global positive solutions, stochastic permanence and extinction. We find out that both stochastic permanence and extinction have close relationships with the stationary probability distribution of the Markov chain. The limit of the average in time of the sample path of the solution is then estimated by two constants related to the stationary distribution and the coefficients. Finally, the main results are illustrated by several examples.
MSC 2000:
*60H10 Stochastic ordinary differential equations
34F05 ODE with randomness
92B05 General biology and biomathematics

Keywords: Brownian motion; stochastic differential equation; generalized Itô's formula; Markov chain; stochastic permanence

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