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arXiv · 2607.25573

Global Dynamics of Trait-Structured Generalised Lotka-Volterra Systems with Trait-Independent Interactions

Manh Hong Duong·Nataliya Balabanova·Blaine van Rensburg
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Abstract

We study the long time dynamics of a selection-mutation integro-differential Lotka-Volterra system of $N$ populations. In our model, fitness depends on a continuous phenotypic trait, but the effect of one population on another is independent of this trait. We establish that, under some usual assumptions on the interactions between populations, the long time behaviour of solutions is exactly determined by the well studied Generalised Lotka-Volterra (ordinary differential) Equation. We also show that, all else being equal, the minimal mutation rate is selected for in a static environment, whereas in an a changing environment, an intermediate mutation rate could be selected instead. The key step in our proofs is establishing that the total population sizes are asymptotically governed by a Generalised Lotka-Volterra Equation, which then allows the use of a general result on asymptotically autonomous dynamical systems.

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Manh Hong Duong, Nataliya Balabanova, Blaine van Rensburg. 2026-07-28. Global Dynamics of Trait-Structured Generalised Lotka-Volterra Systems with Trait-Independent Interactions. https://arxiv.org/abs/2607.25573

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