title: Birth-jump processes and application to forest fire spotting.
abstract: Birth-jump models are designed to describe population models for which growth and spatial spread cannot be decoupled. A birth-jump model is a nonlinear integro-differential equation. We present two different derivations of this equation, one based on a random walk approach and the other based on a two-compartmental reaction-diffusion model. In the case that the redistribution kernels are highly concentrated, we show that the integro-differential equation can be approximated by a reaction-diffusion equation, in which the proliferation rate contributes to both the diffusion term and the reaction term. We completely solve the corresponding critical domain size problem and the minimal wave speed problem. Birth-jump models can be applied in many areas in mathematical biology. We highlight an application of our results in the context of forest fire spread through spotting. We show that spotting increases the invasion speed of a forest fire front.
authors.affiliation: a Department of Mathematical and Statistical Sciences, Centre for Mathematical Biology , University of Alberta , Edmonton , Canada.
authors.forename: T
authors.initials: T
authors.lastname: Hillen
authors.forename: B
authors.initials: B
authors.lastname: Greese
authors.forename: J
authors.initials: J
authors.lastname: Martin
authors.forename: G
authors.initials: G
authors.lastname: de Vries
mesh_terms: D004058:Diffusion; D005390:Fires; D065928:Forests; D008954:Models, Biological; D011157:Population Dynamics
keywords: 35Q92; 45K05; 92B05; birth-jump processes; critical domain size; diffusion limit; integro-differential equations; minimal wave speed; reaction–diffusion equations; wildfire spotting