Extinction and ergodic stationary distribution of a Markovian-switching prey-predator model with additional food for predator

Xiaoxia Guo^1, 2 ; Dehan Ruan³

¹ School of Mathematics and Information Sciences, Guangzhou University, Guangzhou 510006, PR China.
² Department of Mathematics and Statistics, Concordia University, Montreal-H3G2W1, Canada.
³ Guangzhou International Institute of Finance and Guangzhou University, Guangzhou, Guangdong 510405, PR China.

Mathematical modelling of natural phenomena, Tome 15 (2020), article no. 46

Résumé

In this work we have studied a stochastic predator-prey model where the prey grows logistically in the absence of predator. All parameters but carrying capacity have been perturbed with telephone noise. The prey’s growth rate and the predator’s death rate have also been perturbed with white noises. Both of these noises have been proved extremely useful to model rapidly fluctuating phenomena Dimentberg (1988). The conditions under which extinction of predator and prey populations occur have been established. We also give sufficient conditions for positive recurrence and the existence of an ergodic stationary distribution of the positive solution, red which in stochastic predator-prey systems means that the predator and prey populations can be persistent, that is to say, the predator and prey populations can be sustain a quantity that is neither too much nor too little. In our analysis, it is found that the environmental noise plays an important role in extinction as well as coexistence of prey and predator populations. It is shown in numerical simulation that larger white noise intensity will lead to the extinction of the population, while telephone noise may delay or reduce the risk of species extinction.

Détail

DOI : 10.1051/mmnp/2019055

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