Structure-Preserving Numerical Schemes for Two-Stage Local and Nonlocal Dispersal Systems

Markjoe O. Uba

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arXiv · 2609.29524

Structure-Preserving Numerical Schemes for Two-Stage Local and Nonlocal Dispersal Systems

Markjoe O. Uba

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Abstract

We construct and analyze structure-preserving numerical schemes for a two-stage local--nonlocal dispersal system. On general bounded connected smooth habitats, we prove fixed-$δ$ spatial consistency. We introduce a semi-implicit scheme that is uniquely solvable for every $Δt>0$, preserves nonnegativity, and exactly retains the sign of the semidiscrete spectral threshold. A negative threshold yields geometric extinction of the numerical solution, while a positive threshold makes the zero state of the numerical scheme linearly unstable. On rectangular habitats, we construct a reflected Cartesian discretization that is asymptotically compatible with the Neumann local limit, with convergence estimates uniform with respect to the ratio between mesh size and interaction scale. Numerical experiments illustrate the structural, threshold, and local-limit behavior.

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Markjoe O. Uba. 2026-08-25. Structure-Preserving Numerical Schemes for Two-Stage Local and Nonlocal Dispersal Systems. https://arxiv.org/abs/2609.29524

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