Contact and voter processes on the infinite percolation cluster as models of host-Symbiont interactions

We introduce spatially explicit stochastic processes to model multispecies host-symbiont interactions. The host enüironment is static, modeled by the infinite percolation cluster of site percolation. Symbionts eüolüe on the infinite cluster through contact or üoter type interactions, where each host may be infected by a colony of symbionts. In the presence of a single symbiont species, the condition for inüasion as a function of the density of the habitat of hosts and the maximal size of the colonies is inüestigated in details. In the presence of multiple symbiont species, it is proüed that the community of symbionts clusters in two dimensions whereas symbiont species may coexist in higher dimensions.