Dynamic Behaviors of a Stochastic Eco-Epidemiological Model for Viral Infection in the Toxin-Producing Phytoplankton and Zooplankton System

Xiaomei Feng, Yuan Miao, Shulin Sun and Lei Wang
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Xiaomei Feng: School of Mathematics and Information Technology, Yuncheng University, Yuncheng 044000, China
Yuan Miao: School of Mathematics and Computer Science, Shanxi Normal University, Linfen 041004, China
Shulin Sun: School of Mathematics and Computer Science, Shanxi Normal University, Linfen 041004, China
Lei Wang: Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi 830011, China

Mathematics, 2022, vol. 10, issue 8, 1-18

Abstract: It is well known that the evolution of natural populations is almost inevitably disturbed by various environmental factors. Various experiments have shown that the growth of phytoplankton might be affected by nutrient availability, water temperature, and light, while the development of zooplankton is more disturbed by the pH value of the seawater, water temperature, and water movement. However, it is not clear how these environmental fluctuations affect the dynamical behavior of the phytoplankton and zooplankton system. In this paper, a stochastic eco-epidemiological model for viral infection in the toxin-producing phytoplankton and zooplankton system is proposed. Firstly, the existence and uniqueness of globally positive solutions for this model is shown. Secondly, the stochastic boundedness of solutions for the model is proved. Moreover, sufficient conditions for the extinction and persistence in the mean for the phytoplankton and zooplankton are obtained by constructing appropriate stochastic Lyapunov functions and using analytical techniques. Numerical simulations are carried out to demonstrate different dynamical behaviors including coexistence, extinction of the whole plankton system, partial persistence and extinction, and their corresponding probability density curves.

Keywords: stochastic plankton model; viral infection; stochastic boundedness; extinction and persistence in the mean (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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