Biodiversity, like every scientific parameter, needs to be measured quantitatively. There is however no single yardstick for the different levels. To “measure” biodiversity one normally resorts to species, and following that, to the ecosystems that host them so as to introduce parameters like the interaction between species and the environment and the concept of ecological niche. Understanding how many , and which, species live in an ecosystem, and their relative abundance, represents one of the levels of “reading” biodiversity more completely.
In order to do this numerous indexes have been honed that are normally divided into three categories:
- richness indexes, that essentially measure the number of species in a certain sample size;
- distribution indexes, that measure how equally distributed the species abundance values are;
- diversity indexes that combine these two components.
With the application of indexes recognised by european regulatory guidelines (Framework Directive 2000/60/EC) e adopted nationally (Dm Ambiente 8 november 2010, n. 260) or in common usage, it's possible to monitor the qualititive state of acquatic environments based on the modification of the composition of the fauna and the functionality of the ecosystems
Index of macrobentic communities
Index of the ecological state of aquatic comunities
Eutrophication Pollution Index based on Diatoms
index of fluvial functionality
index of perilacueal functionalty
biotic extension index