On the persistence regime for Lotka-Volterra in randomly fluctuating environments

Abstract

In this note, we study the long time behavior of Lotka-Volterra systems whose coefficients vary randomly. Bena{ï}m and Lobry (2015) recently established that randomly switching between two environments that are both favorable to the same species may lead to different regimes: extinction of one species or the other, or persistence of both species. Our purpose here is to describe more accurately the range of parameters leading to these regimes, and the support of the invariant probability measure in case of persistence.