ations ([Fig. 0](#pone-0000000-g000){ref-type="fig"}).  ![Elasticity of the population growth rate to changes in matrix elements summed over different regions (growth, loop, shrinkage and fertility) for southern (Portugal) and central (France) *A. nodosum* and *F. serratus* populations.](pone.0000000.g000){#pone-0000000-g000}  ![Elasticity of the population growth rate to changes in the survival transitions for each stage class in southern (Portugal) and central (France) *A. nodosum* and *F. serratus* populations.](pone.0000000.g000){#pone-0000000-g000}  The 