ORIGINAL PAPERS

Population Dynamics in an Advective Environment

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  • 1. Department of Mathematics, The Ohio State University, Columbus, OH, 43210, USA;
    2. School of Mathematical Sciences, CMA-Shanghai and MOE-LSC, Shanghai Jiao Tong University, Shanghai, 200240, China

Received date: 2022-10-31

  Revised date: 2023-02-04

  Online published: 2024-04-16

Supported by

We sincerely thank the referee for their helpful comments and suggestions. KYL is partially supported by the National Science Foundation grant DMS-1853561. YL is partially supported by the National Science Foundation of China grants No. 12250710674, 12261160366, 12226328.

Abstract

We consider a one-dimensional reaction-diffusion equation describing single- and two-species population dynamics in an advective environment, based on the modeling frameworks proposed by Lutscher et al. in 2006. We analyze the effect of rate of loss of individuals at both the upstream and downstream boundaries. In the single-species case, we prove the existence of the critical domain size and provide explicit formulas in terms of model parameters. We further derive qualitative properties of the critical domain size and show that, in some cases, the critical domain size is either strictly decreasing over all diffusion rates, or monotonically increasing after first decreasing to a minimum. We also consider competition between species differing only in their diffusion rates. For two species having large diffusion rates, we give a sufficient condition to determine whether the faster or slower diffuser wins the competition. We also briefly discuss applications of these results to competition in species whose spatial niche is affected by shifting isotherms caused by climate change.

Cite this article

King-Yeung Lam, Ray Lee, Yuan Lou . Population Dynamics in an Advective Environment[J]. Communications on Applied Mathematics and Computation, 2024 , 6(1) : 399 -430 . DOI: 10.1007/s42967-023-00259-9

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