Figure 2.

The dependence of reserve levels on predation pressure, comparing three forms of the function A(z) which specifies the probability that a predator will attempt to mount an attack. (a) Effect of y when A(z)=y for all z; (b) effect of y₀ when A(0)=y₀ and A(z)=0.001 for z≥1; and (c) effect of y₁ when A(0)=0.01 and A(z)=y₁ for z≥1. In each case two measures of reserve level are given; asymptotic reserves x** (dashed line) and overall mean reserves (solid line). In (a) and (b) β(0)=0.8 and β(z)=0.05 for z≥1. In (c) β(z)=0.2 for all z. Other parameters as for figure 1.