$ K_1=0.5 $ | $ K_1=1.1 $ | $ K_1=2.0 $ | |
$ \varepsilon=0.5 $ | $ 0.05530 $ | $ 0.05874 $ | $ 0.06953 $ |
$ \varepsilon=0.01 $ | $ 0.08562 $ | $ 0.09010 $ | $ 0.10300 $ |
$ \varepsilon=0.0001 $ | $ 0.09160 $ | $ 0.09779 $ | $ 0.10928 $ |
The spatial segregation of the populations occurs commonly in ecology. One typical way to understand this phenomenon is to consider strong competition in some species. In this paper, we shall consider multiple-species competition-diffusion models. Under the condition that some interspecies competition rates are large, we show that the segregation phenomenon occurs. Furthermore, we derive some two-phase Stefan-like problems appearing as the singular limit, which may provide some modeling interpretation for free boundary problems studied in the literature.
Citation: |
Figure 2. Snapshots of a solution behavior when $ d_w = 0.1 $, $ \varepsilon = 0.00001 $ and $ L = 25 $. The colors of curves indicate the same as the ones in Figure 1
Figure 3. Snapshots of a solution behavior when $ d_w = 0.7 $, $ \varepsilon = 0.00001 $ and $ L = 25 $. The colors of curves indicate the same as the ones in Figure 1
Figure 5. Profiles and velocities of traveling wave solutions with $ d_w = 0.0 $ when $ \varepsilon $ varies. The colors of curves indicate the same as the ones in Figure 1
Figure 6. Profiles and velocities of traveling wave solutions with $ d_w = 0.8 $ when $ \varepsilon $ varies. The colors of curves indicate the same as the ones in Figure 1
Figure 7. Relations between the diffusivity $ d_w $ and the traveling wave velocity $ c $ for each $ \varepsilon $ value are shown. The horizontal axis is $ d_w $ and the vertical one is $ c $ when $ K_1 $ varies. The parameter values except for $ K_1 $ are the same as the ones in Figure 4. (a) $ K_1 = 0.5 $ (b) $ K_1 = 2.0 $
Figure 8. (a) Relations between the carrying capacity $ K_1 $ and the traveling wave velocity $ c $ for each $ \varepsilon $ value when $ d_w = 0.4 $. (b) Relations between the diffusivity $ d_2 $ and the traveling wave velocity $ c $ for each $ \varepsilon $ value when $ d_w = 0.4 $. In both cases, the other parameter values are the same as the ones in Figure 4
Figure 9. Relations between the diffusivity $ d_1 $ and the traveling wave velocity $ c $ for each $ \varepsilon $ value when $ d_w = 0.3 $. The other parameter values are the same as the ones in Figure 4
Figure 12. The profiles of traveling wave solutions in Figure 11. The blue, green and black curves respectively indicate $ u_1 $, $ u_2 $ and $ w $ in (40)
Figure 13. The change of the wave velocity $ c $ according to the diffusion coefficient $ d_1 $ and $ d_2 $. The parameter value is $ d_w = 0.3 $ and the others are the same as the ones in Figure 11
Table 1.
The wave velocities
$ K_1=0.5 $ | $ K_1=1.1 $ | $ K_1=2.0 $ | |
$ \varepsilon=0.5 $ | $ 0.05530 $ | $ 0.05874 $ | $ 0.06953 $ |
$ \varepsilon=0.01 $ | $ 0.08562 $ | $ 0.09010 $ | $ 0.10300 $ |
$ \varepsilon=0.0001 $ | $ 0.09160 $ | $ 0.09779 $ | $ 0.10928 $ |
Table 2.
The wave velocities
$ K_1=0.5 $ | $ K_1=1.1 $ | $ K_1=2.0 $ | |
$ \varepsilon=0.5 $ | $ -0.04895 $ | $ -0.04339 $ | $ -0.02647 $ |
$ \varepsilon=0.01 $ | $ -0.10099 $ | $ -0.09296 $ | $ -0.06883 $ |
$ \varepsilon=0.0001 $ | $ -0.10873 $ | $ -0.10026 $ | $ -0.07482 $ |
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Snapshots of a solution behavior when
Snapshots of a solution behavior when
Snapshots of a solution behavior when
Relations between the diffusivity
Profiles and velocities of traveling wave solutions with
Profiles and velocities of traveling wave solutions with
Relations between the diffusivity
(a) Relations between the carrying capacity
Relations between the diffusivity
The profiles of traveling wave solutions in Figure 9. The value of
Relations in (40) between the diffusivity
The profiles of traveling wave solutions in Figure 11. The blue, green and black curves respectively indicate
The change of the wave velocity