La regionalizzazione biogeografica quale elemento per una migliore comprensione del valore degli habitat: il caso della Regione Marche

Habitat Directive provides the subdivision of the habitats indicated in Annex I in different biogegraphic regions on the basis of a classification of the U.E. territory extremely simplified. On the contrary, in the opinion of the Authors, a precise definition of the different hierarchical levels of the territory could allow to recognise, for each habitat, a more precise collocation and to make e new classification of them in the regional context. Within the REM Project, the biogeographical classification of the regional territory was done to the vegetation series level and the results are here presented. The hierarchical scheme utilised, follows that one proposed by Rivas-Martinez and for the upper hierarchical levels, from Region to subprovince, the unities defined in the European Biogeographic map have been taken. For Marche Region 5 sectors, 10 subsectors, 14 districts, 96 plant landscape units and 146 plant landscape elements within them a high number of tessera have been found. For the upper biogeographic levels, the maps are here presented while the plant landscape elements are listed following the hierarchical order.