Created in 2013, the SURFSTAT network is part of the biology component of the WFD network. Its main objective is to assess, using a statistical approach, the ecological heterogeneity of the seabed in space and time between 0 and 80 m depth on the French Mediterranean coast. The description of the heterogeneity is essential to assess the fragmentation and connectivity of habitats.
The first mission of this network is to complete the existing 2D underwater habitat mapping (realization and study of geographical maps) and to establish the 3D correspondence of marine habitats. The second is to propose and measure different composition and configuration variables that can be used as surface (= spatial) indicators of coastal water quality from these marine habitat maps. SURFSTAT is thus a first step towards a large-scale monitoring tool (with interpretation grid) of marine habitats.
Through this monitoring network, we carry out a surface analysis of the Posidonia seagrass habitat :
D : Simpson’s index
Ni : area of a given habitat on a 50m² pixel.
N : total area of habitats.
➔ The index varies between 0 and 1. The closer it is to 0, the higher the chance of different habitats.
By clicking directly on the button “Access the maps“, just below, you will find all the results of this project since 2013, as well as a comparison tool that allows you to compare a dozen indices (not represented on medtrix) from the analysis of biocenoses conducted under the software R and this at different spatial scales of comparison (Mediterranean, Region, coastal water body). The ‘seagrass’ indices concern only Posidonia meadows (0-40m) and the ‘landscape’ indices take into account all habitats (priority habitats : seagrass and coralligenous & all others detailed in the DONIA EXPERT project ; 0-60m).
Contact : Gwenaëlle Delaruelle/ Agathe Blandin
Porteur du projet : Andromède Océanologie
Fréquence d’actualisation : Tous les deux ans
Dernière actualisation de la cartographie : Mai 2021.
Partenaire : Agence de l’eau Rhône Méditerranée et Corse