Global asymptotic coherence in discrete dynamical systems

Spatial synchrony (coherence) in dynamical systems is of both theoretical and applied importance. We address this problem for a generalization of coupled map lattices (CMLs). In the systems we study, which we term ‘‘meta-CMLs,’’ the map at each lattice point may be multidimensional (corresponding, for example, to multi- species ecological systems in which all species have the same dispersal pattern). Most previous work on coherence of CMLs has focused on local stability. Here, we prove a global theorem that provides a useful sufficient condition guaranteeing decay of incoherence in meta-CMLs regardless of initial conditions and regard- less of the nature of the attractors of the system. This result facilitates useful analyses of a variety of applied problems, includ- ing conservation of endangered species and eradication of pests or infectious diseases.