Time Delayed Stage-Structured Predator-Prey Model with Birth Pulse and Pest Control Tactics

Figure 3

The influence of some key parameters on the threshold level 𝑅₁; the other parameter values are as follows: 𝑟=3, 𝜔=0.2,𝑘=0.2,𝑑₁=0.1, 𝑑₂=0.2,𝑑₃=0.15, and 𝑎=5.(a) 𝑏=7,𝜏=0.2, 𝑇∶1→3.8,𝑝∶0.2→0.6; (b) 𝑏=7,𝑝=0.25, 𝑇∶3.5→4.5, 𝜏∶0.1→0.5; (c) 𝑏=7,𝑇=4, 𝑝∶0.1→0.5,𝜏∶0.1→0.5; (d) 𝜏=0.2,𝑇=3,𝑏∶5→8, 𝑝∶0.1→0.4.

(a)

(b)

(c)

(d)