Minimal Model of Plankton Systems Revisited with Spatial Diffusion and Maturation Delay

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• 作者：Jiantao Zhao ; Jianjun Paul Tian ; Junjie Wei
• 关键词：Diffusive plankton ecosystem ; Hopf bifurcation ; Stability ; Delay
• 刊名：Bulletin of Mathematical Biology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：78
• 期：3
• 页码：381-412
• 全文大小：1,085 KB
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• 作者单位：Jiantao Zhao (1) (3)
  Jianjun Paul Tian (2)
  Junjie Wei (1)
  
  1. Department of Mathematics, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, People’s Republic of China
  3. School of Science, Qiqihar University, Qiqihar, 161006, Heilongjiang, People’s Republic of China
  2. Department of Mathematical Sciences, New Mexico State University, Las Cruces, NM, 88001, USA
  
• 刊物类别：Mathematics and Statistics
• 刊物主题：Mathematics
  Mathematical Biology
  
• 出版者：Springer New York
• ISSN：1522-9602

文摘

This study revisits the minimal model for a plankton ecosystem proposed by Scheffer with spatial diffusion of plankton and the delay of the maturation period of herbivorous zooplankton. It deepens our understanding of effects of the nutrients and the predation of fish upon zooplankton on the dynamical patterns of the plankton system and also presents new phenomena induced by the delay with spatial diffusion. When the nutrient level is sufficient low, the zooplankton population collapses and the phytoplankton population reaches its carrying capacity. Mathematically, the global stability of the boundary equilibrium is proved. As the nutrient level increases, the system switches to coexistent equilibria or oscillations depending on the maturation period of zooplankton and the predation rate of fish on herbivorous zooplankton. Under an eutrophic condition, there is a unique coexistent homogeneous equilibrium, and the equilibrium density of phytoplankton increases, while the equilibrium density of herbivorous zooplankton decreases as the fish predation rate on herbivorous zooplankton is increasing. The study shows that the system will never collapses under the eutrophic condition unless the fish predation rate approaches infinite. The study also finds a functional bifurcation relation between the delay parameter of the maturation period of herbivorous zooplankton and the fish predation rate on herbivorous zooplankton that, above a critical value of the fish predation rate, the system stays at the coexistent equilibrium, and below that value, the system switches its dynamical patterns among stable and unstable equilibria and oscillations. The oscillations emerge from Hopf bifurcations, and a detailed mathematical analysis about the Hopf bifurcations is carried out to give relevant ecological predications.