Wessel and Smith (1996) Euphotic Ocean Color Web  depth Geostrophic velocities of Aviso  sea surface SSALTO/DUACS current Nutrient Halpern et al.,  input 2008 Phosphate Tyberghein et al.,  concentration 2012 Pollutants Halpern et al., (inorganic) 2008 Pollutants Halpern et al., (organic) 2008 Sea Surface Tyberghein et al., Temperature 2012 Silicate Tyberghein et al.,  concentration 2012 Based on bathymetry layer of the of EMODNet  seafloor Hydrography Portal Supplementary S2. Georeferenced occurrence data on coralligenous outcrops and maërl beds, as collated for each country bordering the Mediterranean Sea. Sampling intensity being very uneven across the different countries, the numbers of points/lines/polygons are unrelated to the actual surface areas covered by these habitats. For instance, the high numbers for Malta and France (Corsica) result from two high-resolution surveys that took place northwest and east of Malta and north of Corsica. Nevertheless, the information in this table reflects the unprecedented extent of the collated datasets for coralligenous outcrops and maërl beds in the Mediterranean Sea. Coralligenous outcrops Maërl beds Total Point Line Polygon Point Polygon Albania 0 0 4 0 0 4 Country Algeria 10 0 7 0 0 17
Wessel and Smith (1996) Euphotic depth Ocean Color Web  Geostrophic velocities of sea surface current Aviso SSALTO/DUACS  Nutrient input Halpern et al., 2008  Phosphate concentration Tyberghein et al., 2012  Pollutants (inorganic) Halpern et al., 2008 Pollutants (organic) Halpern et al., 2008 Sea Surface Temperature Tyberghein et al., 2012 Silicate concentration Tyberghein et al., 2012  of the seafloor Based on bathymetry layer of EMODNet Hydrography Portal  Supplementary S2. Georeferenced occurrence data on coralligenous outcrops and maërl beds, as collated for each country bordering the Mediterranean Sea. Sampling intensity being very uneven across the different countries, the numbers of points/lines/polygons are unrelated to the actual surface areas covered by these habitats. For instance, the high numbers for Malta and France (Corsica) result from two high-resolution surveys that took place northwest and east of Malta and north of Corsica. Nevertheless, the information in this table reflects the unprecedented extent of the collated datasets for coralligenous outcrops and maërl beds in the Mediterranean Sea. Coralligenous outcrops Maërl beds Total Point Line Polygon Point Polygon Country Albania 0 0 4 0 0 4 Algeria 10 0 7 0 0 17
srep05073-s1.docx