Seasonal effects on a Beddington-DeAngelis type predator-prey system with impulsive perturbations
The authors consider the following periodical impulsive differential equations which represent a predator-prey system \[ \begin{gathered} x'(t)= rx(t)\Biggl(1- {x(t)\over k}\Biggr)- {ax(t) y(t)\over by(t)+ x(t)+c}+\lambda x(t)\sin(\omega t),\\ y'(t)= -dy(t)+ {eax(t) y(t)\over by(t)+ x(t)+c},\quad t\neq n\tau,\\ x(t^+)= (1- p_1) x(t),\;t= n\tau,\;y(t^+)= (1- p_2) y(t)+ q,\;(x(0^+), y(0^+))= (x_0, y_0),\end{gathered}\tag{1} \] where \(\tau\) is the period of impulsive immigration or stock of the predator, \(0\leq p_1\), \(p_2< 1\) and \(x(t)\), \(y(t)\) represent the population densities of prey and predator, respectively. The authors perform a numerical analysis of (1) for the case without of impulses, i.e. \(p_1= p_2= 0\). Sufficient conditions for the local asymptotic stability of (1) are derived. For the periodic solution \((0,y^*(t))\) sufficient conditions for its local asymptotic stability are found. A numerical analysis of seasonal effect and impulsive perturbations is performed.
scientific article; zbMATH DE number 5627605