Data collected with the national sampling method (WFD compliant) only. 50% of these data were collected in 2008. Taxa list, relative abundances, maximum colonization depth, substrate are collected on sampling sites (called observation units). Each sampling site is made of 1 section of shore and 3 perpendicular profiles. Number of units depending on the lake size.
More information on this dataset can be found in the Freshwater Metadatabase - BF_W_84-L-CM (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BF_W_84-L-CM).