Figure 2

Non-symmetrical effects of p and q on the behavior of approaching equilibrium. The control was done at every April and the value of ${\bar{f}}_n$ and ${\bar{s}}_n$ at the initial April are 22.14 and 0, respectively. The black and the grey lines, respectively, represent the population size and the amount of the sterile individuals in the case where p = 0.4 and q = 0.8, while the black dashed line and the grey dashed line, respectively, stand for the population size and the amount of sterile individuals in the case where p = 0.8 and q = 0.4.