Supplementary material Coralligenous and maërl habitats: predictive modelling to identify their spatial distributions across the Mediterranean Sea Martin CS1,2, Giannoulaki M1, De Leo F3, Scardi M4, Salomidi M5, Knitweiss L6, Pace ML6, Garofalo G7, Gristina M7, Ballesteros E8, Bavestrello G9, Belluscio A10, Cebrian E8,11, Gerakaris V5, Pergent G12, Pergent-Martini C12, Schembri PJ13, Terribile K13, Rizzo L3, Ben Souissi J14, Bonacorsi M12, Guarnieri G3, Krzelj M15, Macic V16, Punzo E17, Valavanis V1, Fraschetti S3 1 Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, PO box 2214, 71003 Heraklion (Greece) - [email protected] - [email protected] 2 UNEP World Conservation Monitoring Centre, 219 Huntingdon Road, Cambridge CB3 0DL (UK) - corinne.martin@unep- wcmc.org 3 Laboratory of Ecology and Marine Biology, University of Salento, CoNISMa, 73100 Lecce (Italy) - [email protected] - [email protected] - [email protected] 4 Department of Biology, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, 00133 Rome (Italy) - [email protected] 5 Institute of Oceanography, Hellenic Centre for Marine Research, PO box 712, 19013 Anavyssos (Greece) - [email protected] - [email protected] 6 Ministry for Sustainable Development, the Environment and Climate Change - Fisheries Resource Unit (MSDEC-FRU), Ghammieri, Marsa MRS 3303 (Malta) - [email protected] - [email protected] 7 Istituto per l'Ambiente Marino Costiero, National Research Council, 91026 Mazara del Vallo (TP) (Italy) - [email protected] - [email protected] 8 Centre d’Estudis Avançats de Blanes-CSIC, 17300 Blanes (Spain) - [email protected] - [email protected] 9 Dipartimento per lo studio del Territorio e delle sue Risorse, University of Genoa, Genoa (Italy) - [email protected] 10 Department of Environmental Biology, University of Rome “La Sapienza”, Viale dell’Università, 32, 00185 Rome (Italy) - [email protected] 11 Departament de Ciències Ambientals, Facultat de Ciències, Universitat de Girona, 17071 Girona (Spain) - [email protected] 12 FRES 3041, EqEL, University of Corsica, Faculty of Sciences, BP 52, 20250 Corte (France) - [email protected] - [email protected] - [email protected] 1 13 Department of Biology, University of Malta, Msida MSD2080 (Malta) [email protected] - [email protected] 14 Institut National Agronomique de Tunisie, 43 Avenue Charles Nicolle, 1082 Tunis (Tunisia) - [email protected] 15 University Department of Marine Studies, University of Split, Livanjska 5/III, 21000 Split (Croatia) - [email protected] 16 Institute of marine biology, University of Montenegro, 85330 Kotor (Montenegro) - [email protected] 17 Institute of Marine Sciences, National Research Council, Largo Fiera della Pesca, 60125 Ancona (Italy) - [email protected] 2 Supplementary Figure S1. Maps of the 12 predictor variables used as input into the distribution models: (a) bathymetry; (b) bottom salinity; (c) bottom temperature; (d) bottom type; (e) distance to ports; (f) distance to (major) river mouths; (g) euphotic depth; (h) nutrient input; (i) phosphate concentration; (j) geostrophic velocities sea surface currents; (k) silicate concentration; (l) slope of the seafloor. All maps were created using ArcGIS® software by Esri (Environmental Systems Resource Institute, ArcMap 10.1, (www.esri.com) 3 4 5 6 Supplementary Figure S2. Correlation matrix for the subset of predictor variables selected for model development (only the 11 continuous variables are shown). 7 Supplementary Figure S3. Test areas excluded from model development, and used to assess model performance. Maps were created using ArcGIS® software by Esri (Environmental Systems Resource Institute, ArcMap 10.1, (www.esri.com). 8 Supplementary Figure S4. Expert-derived classification of marine areas (0-200 m) according to relative sampling effort for (a) coralligenous outcrops and (b) maërl beds. Maps were created using ArcGIS® software by Esri (Environmental Systems Resource Institute, ArcMap 10.1, (www.esri.com). 9 Supplementary Figure S5. Jackknife tests of variable importance for the coralligenous outcrops distribution model: (a) test gain, (b) test AUC. cora: coralligenous outcrops. See Table 3 for full names of environmental variables. 10 Supplementary Figure S6. Jackknife tests of variable importance for the maërl beds distribution model: (a) test gain, (b) test AUC. See Table 3 for full names of environmental variables. 11 Supplementary Table S1. Variables considered for use as input into the models. A subset (12 variables) was selected () for model development. Model development Name Source Bathymetry Bottom salinity Bottom temperature Bottom type Chlorophyll a concentration Diffuse attenuation coefficient Distance to ports Distance to (major) river mouths Euphotic depth Geostrophic velocities of sea surface current Nutrient input Phosphate concentration Pollutants (inorganic) Pollutants (organic) Sea Surface Temperature Silicate concentration EMODNet Hydrography Portal World Ocean Database 2009 World Ocean Database 200961 Halpern et al., 2008 Tyberghein et al., 2012 Tyberghein et al., 2012 Port location from World Port Index 2011 River mouth location from ESRI Data and Maps (2012) and Wessel and Smith (1996) Ocean Color Web Aviso SSALTO/DUACS Halpern et al., 2008 Tyberghein et al., 2012 Halpern et al., 2008 Halpern et al., 2008 Tyberghein et al., 2012 Tyberghein et al., 2012 Based on bathymetry layer of EMODNet Hydrography Portal Slope of the seafloor 12 Supplementary Table 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. Albania Algeria Bosnia and Herzegovina Croatia Cyprus Egypt France (incl. Monaco) Greece Israel Italy Country Lebanon Libya Malta Montenegro Morocco Slovenia Spain Syria Tunisia Turkey Total Coralligenous outcrops Point Line Polygon 0 0 4 10 0 7 0 0 0 189 0 5 1 0 9 0 0 0 65 0 22,215 93 0 12 2 0 2 365 0 1,017 0 0 0 4 0 0 3,409 0 12 1 7 0 7 0 0 0 0 0 107 0 341 4 0 0 20 5 7 16 0 0 4,293 12 23,632 13 Maërl beds Total Point Polygon 0 0 4 0 0 17 0 0 0 10 0 204 0 3 13 0 0 0 0 712 22,927 27 3 135 0 3 7 8 13 1,406 0 0 0 0 0 4 333 2 3,757 0 0 8 0 0 7 0 0 0 13 11 1,988 2 0 6 0 0 35 23 0 39 416 748 Supplementary References. Data sources used to build the occurrence datasets for coralligenous outcrops and maërl beds across the Mediterranean Sea. Peer-reviewed articles and Grey literature: 1. Abbiati, M., Airoldi, L., Costantini, F., Fava, F. & Ponti, M. Spatial and temporal variation of assemblages in Mediterranean Coralligenous Reefs. In Proc. 1st Symp. 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