The dynamics of nutrient, toxic phytoplankton, nontoxic phytoplankton and zooplankton model

Hasnaa Fiesal Mohammed Hussien, Raid Kamel Naji, Azhar Abbas Majeed
2016 International Journal of Applied Mathematical Research  
<p>The objective of this paper is to study the dynamical behavior of an aquatic food web system. A mathematical model that includes nutrients, phytoplankton and zooplankton is proposed and analyzed. It is assumed that, the phytoplankton divided into two compartments namely toxic phytoplankton which produces a toxic substance as a defensive strategy against predation by zooplankton, and a nontoxic phytoplankton. All the feeding processes in this food web are formulating according to the
more » ... terra functional response. This model is represented mathematically by the set of nonlinear differential equations. The existence, uniqueness and boundedness of the solution of this model are investigated. The local and global stability conditions of all possible equilibrium points are established. The occurrence of local bifurcation and Hopf bifurcation are investigated. Finally, numerical simulation is used to study the global dynamics of this model.</p>
doi:10.14419/ijamr.v5i1.5427 fatcat:6gi7vedoerdf3djw6tmqbbycq4