Figure 1

Solutions of system ( SM ) for \(\pmb{r_{1}=0.02}\) , \(\pmb{a_{11}=0.1}\) , \(\pmb{a_{12} =0.03}\) , \(\pmb{r_{2}=3}\) , \(\pmb{a_{22}=0.3}\) , \(\pmb{\sigma_{1}=\sigma_{2}=0.02}\) , \(\pmb{m=n=1.25}\) , \(\pmb{\tau=1}\) . The horizontal axis represents the time t, the vertical axis represents the population sizes. (a) is with \(a_{21}=0.3\); (b) is with \(a_{21}=500\).