Journal Articles Theoretical Population Biology Year : 2024

Spatial invasion of cooperative parasites

Vianney Brouard
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  • PersonId : 1508938
Cornelia Pokalyuk
Marco Seiler
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Hung Tran
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  • PersonId : 1508971

Abstract

In this paper we study invasion probabilities and invasion times of cooperative parasites spreading in spatially structured host populations. The spatial structure of the host population is given by a random geometric graph on [0, 1] n , n ∈ N, with a Poisson (N )-distributed number of vertices and in which vertices are connected over an edge when they have a distance of at most rN ∈ Θ(Nβ-1/n) for some 0 < β < 1 and N → ∞. At a host infection many parasites are generated and parasites move along edges to neighbouring hosts. We assume that parasites have to cooperate to infect hosts, in the sense that at least two parasites need to attack a host simultaneously. We find lower and upper bounds on the invasion probability of the parasites in terms of survival probabilities of branching processes with cooperation. Furthermore, we characterize the asymptotic invasion time. An important ingredient of the proofs is a comparison with infection dynamics of cooperative parasites in host populations structured according to a complete graph, i.e. in wellmixed host populations. For these infection processes we can show that invasion probabilities are asymptotically equal to survival probabilities of branching processes with cooperation. Furthermore, we build in the proofs on techniques developed in [BP22], where an analogous invasion process has been studied for host populations structured according to a configuration model. We substantiate our results with simulations
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hal-04952825 , version 1 (17-02-2025)

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Vianney Brouard, Cornelia Pokalyuk, Marco Seiler, Hung Tran. Spatial invasion of cooperative parasites. Theoretical Population Biology, 2024, 159, pp.35-58. ⟨10.1016/j.tpb.2024.07.001⟩. ⟨hal-04952825⟩
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