Flora

All living organisms (animals and plants including microorganisms) that occupy a given ecosystem. This group of living organisms is characterized by a specific composition and by interdependence phenomena. It occupies an area known as biotope and with the latter makes an ecosystem. A biocenosis changes over time (pioneer phase, intermediate phase and equilibrium phase).

Area designated as requiring special protection under the European directives. A register is established on a river basin scale identifying various protected areas: vulnerable areas ("Nitrates" Directive), sensitive zones ("Urban Wastewater Treatment" Directive), areas designated under the "Habitats" Directive and "Birds" Directive as bathing areas, shellfish areas, categories of streams (Directive 78/659/EEC). The