Supplementary material Table 2. Description of metrics used in the Member State lake phytobenthos and macrophyte assessment methods Member State Phytobenthos assessment system Algal groups included in the phytobenthos assessment system Macrophyte assessment system Macroalgae included in the macrophyte assessment system Austria Not developed AIM for Lakes (Austrian Index Macrophytes for lakes) Not included Belgium Proportion of and Diatoms (PISIAD) Diatoms Flemish macrophyte assessment system Enteromorpha, Hydrodictyon and Vaucheria included in the indicator list of two sensitivity indices; Presence of cyanobacteria film included in the growth form metrics; Abundance of filamentous algae included in the submerged vegetation development metrics Bulgaria Under development Bulgarian macrophyte assessment method Not included Croatia TIDHR Diatoms Biocenological method Not included Czech Republic Not developed Under development Cyprus Not developed Not developed Denmark Under development Danish Lake Macrophytes Index Not included Estonia Not developed Estonian surface water ecological quality assessment – lake macrophytes Abundance of large green filamentous algae included as one of the metrics Finland IPS index Diatoms Finnish macrophyte classification system (Finnmac) Not included France development IBML (French Macrophyte Index for Lakes) Different taxa of Bacillariophyta, Chlorophyta, Cyanophyta, Rhodophyta and Bacteria included in the indicator list: ranging from sensitive Hildenbrandia to tolerant Stigeoclonium tenue and Sphaerotilus sp.
Germany Module Phytobenthos German assessment system for macrophytes and phytobenthos (PHYLIB) Diatoms Module Macrophytes of German assessment system for macrophytes and phytobenthos (PHYLIB) Not included Greece Not developed Not developed Hungary MIL (Multimetric Index for Lakes) Diatoms Hungarian method for assessment of macrophytes in rivers, lakes and reservoirs Not included Ireland Lake Trophic Diatom Index Diatoms Free macrophyte index “Filamentous alga” included in the indicator list for two sensitivity metrics: RF% Tolerant taxa and Plant Trophic score Italy EPI-L index Diatoms MacroIMMI (Macrophytic index for the evaluation of the ecological quality of the Italian lakes) Not included Latvia Not developed Latvian macrophyte assessment method Abundance of large green filamentous algae included as one of the metrics Lithuania Under development Lithuanian macrophyte assessment method Not included Netherlands Phytobenthos metrics (only for one lake type) Diatoms WFD-metrics for natural water types Cover of floating algae bed (% cover) included in the growth form metric Norway Not developed National macrophyte index (Trophic Index – TIc) Not included Poland PL IOJ (Multimetric Diatom Index for Lakes) Diatoms Macrophyte based indication method for lakes - Ecological Status Macrophyte Index ESMI Not included Portugal Not developed Not developed Romania Under development Methodology for aquatic macrophyte inventory in Not included
Slovakia Not developed Not developed Slovenia Trophic Index (TI) Diatoms SMILE (Slovenian index for lake ecosystems) Not included Spain Not developed Spanish macrophyte assessment method in lakes Not included Sweden IPS index Diatoms Trophic Macrophyte (TMI) Not included UK DARLEQ 2 index Diatoms LEAFPACS lake macrophyte classification tool Batrachospermum sp, filamentous algae, Hydrodyction reticulatum and Ulva flexuosa included in the macrophyte index; Relative cover of filamentous algae included as one of the metrics \