We will select three sectors that represent high, medium, and low electrical conductivity of the Pianosa aquifer, based on the published piezometric map (https://brp.cnr.it/index.php /it/progetti/progetti-in-corso/26-pianosaquifer). Using the map of vegetation (Colom et al., 2004) we will install three square plots of 10x10m in each sector. In each plot, we will characterize the vegetation (cover and species richness) and we will count, identify, and mark all the present shrubs. We will select 10 adults of each shrub species to measure the height and two canopy diameters. We will identify all herbs and grasses under the canopy of each shrub in four 1 m2-square located in the four cardinal points. We will repeat the same measures in gaps between the shrubs. The herbs and grasses will be classified based on their origin (native, exotic) and life cycle (perennial, annual). Colom M.R., F.P. Vaccari, A. Scartazza, E. Brugnoli, G. Zerbi, S. Sforzi, R. Baraldi, Cotrufo M.F., L. DʼAcqui, C.Santi, C. Vazzana , R.Vivoli, L. Spaccino.2004. Pianosa Island: Structure, Functioning and Biodiversity of Main Ecosystems. Journal of Mediterranean Ecology vol. 5, No.1.