Figure P20.4

Figure P20.4. Optimal survival when there is no competition. The shaded area shows the combinations of survival vA, vB that are possible (vA2 + vB2 ≤ 1); the lines show contours of average survival (thick lines at intervals of 0.1). (A) Eggs are laid equally in A, B; (B) eggs are laid on A, B in proportions 7:24.