Spreadability, vulnerability, regional viability and protector control

In this work, we present some concepts recently introduced in the analysis and control of Distributed Parameter Systems: Spreadability, vulnerability, regional viability and protector control. These concepts permit to describe many biogeographical phenomena, as those of pollution, desertification or epidemics, which are characterized by a spatio-temporal evolution. We give some connection between such concepts. To illustrate these concepts an example is presented.