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Evolution of dispersal in advective homogeneous environments

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    * Corresponding author

The first author is supported by the National Natural Science Foundation of China(Nos. 11801089, 11901110) and the second author is supported by the Postdoctoral Science Foundation of China(No.2018M643281), the Fundamental Research Funds for the Central Universities (No. 191gpy246) and National Natural Science Foundation of China(No. 11901596)

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  • The effects of weak and strong advection on the dynamics of reaction-diffusion models have long been investigated. In contrast, the role of intermediate advection still remains poorly understood. This paper is devoted to studying a two-species competition model in a one-dimensional advective homogeneous environment, where the two species are identical except their diffusion rates and advection rates. Zhou (P. Zhou, On a Lotka-Volterra competition system: diffusion vs advection, Calc. Var. Partial Differential Equations, 55 (2016), Art. 137, 29 pp) considered the system under the no-flux boundary conditions. It is pointed that, in this paper, we focus on the case where the upstream end has the Neumann boundary condition and the downstream end has the hostile condition. By employing a new approach, we firstly determine necessary and sufficient conditions for the persistence of the corresponding single species model, in forms of the critical diffusion rate and critical advection rate. Furthermore, for the two-species model, we find that (i) the strategy of slower diffusion together with faster advection is always favorable; (ii) two species will also coexist when the faster advection with appropriate faster diffusion.

    Mathematics Subject Classification: Primary:35K57, 35K61, 37C65, 92D25.


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