Figure 4.

(a) Change in the maximum/minimum of the oscillating birth rate births(t), corresponding to growth in the high and low resource environments, as the amplitude of oscillations δ varies (blue). Maximum = 0.3684δ; minimum = −0.0699 δ/(1–0.9225δ). The black dashed line shows the average birth rate at amplitude δ. Insert: step function between minimum and maximum, with an equal amount of time spent in each environment. (b) Evolved host resistance u* and (c) evolved parasite infectivity v* as amplitude δ increases. (Online version in colour.)