Figure 7From: Qualitative analysis of a discrete-time phytoplankton–zooplankton model with Holling type-II response and toxicityPlots and phase portraits for system (1.3) for \(a=2.1\), \(q_{1}=0.09\), \(q_{2}=0.3\), \(r=1.5\), \(c=0.14\), \(k=100\), \(\beta =0.5\), \(\alpha =0.69\), \(\delta =0.001\), \(\rho =0.1\), and \(m_{2}=0.021\)Back to article page