Asymptotic behaviors of jellyfish model with stage structure

Zin Thu Win; Boping Tian; Shengqiang Liu; Zin Thu Win; Boping Tian; Shengqiang Liu

doi:10.3934/mbe.2021128

Mathematical Biosciences and Engineering

2021, Volume 18, Issue 3: 2508-2526. doi: 10.3934/mbe.2021128

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Asymptotic behaviors of jellyfish model with stage structure

1.
School of Mathematics, Harbin Institute of Technology, Harbin 150001, China
2.
School of Mathematical Sciences, Tiangong University, Tianjin 300387, China

Received: 31 August 2020 Accepted: 08 March 2021 Published: 15 March 2021

In this paper, a stage-structured jellyfish model with two time delays is formulated and analyzed, the first delay represents the time from the asexually reproduced young polyp to the mature polyp and the second denotes the time from the developed polyp to ephyra (incipient medusa). Global dynamics of the model are obtained via monotone dynamical theory: the jellyfish populations go extinct and the trivial equilibrium is globally asymptotically stable if the survival rate of polyp during cloning and the survival rate of the incipient medusa during strobilation are less than their death rates. And if the survival rate of polyp during cloning and the survival rate of the incipient medusa during strobilation are larger than their death rates, a unique positive equilibrium is globally asymptotically stable. Moreover, it is proved that the only stage of polyps will continue without growing into medusa and the boundary equilibrium is globally asymptotically stable if the survival rate of polyp is larger than its death rate during cloning and if there is no survival of the incipient medusa. Numerical simulations are performed to verify our analytical results and to explore the dynamics with/without delays.
- jellyfish,
- polyp-medusa,
- delay,
- global dynamics,
- stage structure
Citation: Zin Thu Win, Boping Tian, Shengqiang Liu. Asymptotic behaviors of jellyfish model with stage structure[J]. Mathematical Biosciences and Engineering, 2021, 18(3): 2508-2526. doi: 10.3934/mbe.2021128

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Abstract

In this paper, a stage-structured jellyfish model with two time delays is formulated and analyzed, the first delay represents the time from the asexually reproduced young polyp to the mature polyp and the second denotes the time from the developed polyp to ephyra (incipient medusa). Global dynamics of the model are obtained via monotone dynamical theory: the jellyfish populations go extinct and the trivial equilibrium is globally asymptotically stable if the survival rate of polyp during cloning and the survival rate of the incipient medusa during strobilation are less than their death rates. And if the survival rate of polyp during cloning and the survival rate of the incipient medusa during strobilation are larger than their death rates, a unique positive equilibrium is globally asymptotically stable. Moreover, it is proved that the only stage of polyps will continue without growing into medusa and the boundary equilibrium is globally asymptotically stable if the survival rate of polyp is larger than its death rate during cloning and if there is no survival of the incipient medusa. Numerical simulations are performed to verify our analytical results and to explore the dynamics with/without delays.

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