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Spatial segregation of multiple species: A singular limit approach

  • *Corresponding author: Chang-Hong Wu

    *Corresponding author: Chang-Hong Wu

In memory of Professor Masayasu Mimura

H. Izuhara was partially supported by JSPS KAKENHI Grant Number 21K03353. H. Monobe was partially supported by JSPS KAKENHI Grant Number 18K13458. C.-H. Wu was partially supported by the National Science and Technology Council of Taiwan under grant MOST 109-2636-M-009-008 and MOST 111-2115-M-A49-003-MY3.

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  • 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.

    Mathematics Subject Classification: Primary: 35K57, 35K45; Secondary: 92D25.

    Citation:

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  • Figure 1.  Snapshots of a solution behavior when $ d_w = 0 $, $ \varepsilon = 0.00001 $ and $ L = 25 $. The blue, green, red and black curves respectively mean $ u_1 $, $ u_2 $, $ u_3 $ and $ w $, respectively

    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 4.  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 $

    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 10.  The profiles of traveling wave solutions in Figure 9. The value of $ d_1 $ is indicated below each figure. The upper two traveling waves move to the left, and the lower one moves to the right. The colors of curves indicate the same as the ones in Figure 1

    Figure 11.  Relations in (40) 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 $

    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 $ c $ when $ d_w = 0.0 $

    $ 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 $
     | Show Table
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    Table 2.  The wave velocities $ c $ when $ d_w = 1.0 $

    $ 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 $
     | Show Table
    DownLoad: CSV
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