Robust permanence for ecological maps

Abstract

We consider ecological difference equations of the form $X_{t+1}^i=X_t^i{A}_i(X_t)$ where $X_t^i$ is a vector of densities corresponding to the subpopulations of species $i$ (e.g. subpopulations of different ages or living in different patches), $X_t=(X_t^1,X_t^2,\dots ,X_t^m)$ is state of the entire community, and $A_i(X_t)$ are matrices determining the update rule for species $i$. These equations are permanent if they are dissipative and the extinction set $\{X:{\prod }_i\Vert X^i\Vert =0\}$ is repelling. If permanence persists under perturbations of the matrices $A_i(X)$, the equations are robustly permanent. We provide sufficient and necessary conditions for robust permanence in terms of Lyapunov exponents for invariant measures supported by the extinction set. Applications to ecological and epidemiological models are given.

arXiv admin note: text overlap with arXiv:1304.1862

References in corpus (2)

• Persistence in fluctuating environments for interacting structured populations
• Robust permanence for interacting structured populations

Cited by in corpus (2)

• Robust permanence for ecological equations with internal and external feedbacks
• Persistence and extinction for stochastic ecological models with internal and external variables