Figure 1  a, bifurcation and b, complementation. The complementary region and noncomplementary region are marked by C and U, respectively. P represents complementary critical point(r = 3.593). L(r = 3.589) and R(r = 3.597) are selected values of r to compare forecasts in the complementary region and noncomplementary region in figure 2 and 3. It is clearly seen that in complementary region, each population occupies only one branch, and so the two populations both are stabilized.

| Figure 1a | Figure 1b |