The dynamics of an impulsive delay predator-prey model with stage structure and Beddington-type functional response
The authors consider the following stage-structured predator-prey model with impulsive effect \[ \begin{cases} \dot x(t)=x(t)(a-bx(t))-\frac{cx(t)y_2(t)}{\alpha+x(t)+\beta y_2(t)}, &t\neq nT, \\ \dot y_1(t)=\lambda\frac{cx(t)y_2(t)}{\alpha+x(t)+\beta y_2(t)}-d_1y_1(t)-\lambda e^{-d_2\tau}\frac{cx(t-\tau)y_2(t-\tau)}{\alpha+x(t-\tau)+\beta y_2(t-\tau)}, &t\neq nT,\\ \dot y_2(t)=\lambda e^{-d_2\tau}\frac{cx(t-\tau)y_2(t-\tau)}{\alpha+x(t-\tau)+\beta y_2(t-\tau)}-d_2y_2(t)-ry_2^2(t), &t\neq nT,\\ x(t^+)=(1-p)x(t),\;y_1(t^+)=y_1(t)+\mu, \;y_2(t^+)=y_2(t), &t=nT, \end{cases}\tag{1} \] where \(x(t), y_1(t), y_2(t)\) represent the densities of prey, immature predator and mature predator populations at time \(t\), respectively. \(a\) is the intrinsic growth rate of the prey, \(b\) is the intra-specific competition rate of the prey, \(c\) is the capturing rate of the predator, \(\alpha\) is a saturation constant, \(\beta\) scales the impact of the predator interference, \(\lambda\) is the conversion coefficient, \(d_1, d_2\) are the mortality rates of the immature and mature predator, respectively, \(r\) is the intra-specific competition rate of the mature predator, \(\tau\) represents a constant time to maturity for the immature predator, \(p\) \((0\leq p<1)\) represents the partial impulsive harvest of the prey by catching or pesticide, \(\mu\geq 0\) is the amount of immature predators released at fixed time \(t=nT\). By using the discrete dynamical system determined by the stroboscopic map, the existence and global attractivity of the predator-extinction periodic solution are obtained. Based on the theory of impulsive delay differential equations, the permanence of the system is studied.
scientific article; zbMATH DE number 5799993
scientific article