Table 3 Predictor variables used in the models. dd: decimal degrees; psu: practical salinity units; n/a: not applicable. Maps are shown in Supplementary Figure S1
Name | Description | Source | Unit | Native resolution | Abbreviated name |
|---|---|---|---|---|---|
Bathymetry | Depth of the seafloor | EMODNet Hydrography Portal | m | 0.00416 dd | emodnet |
Bottom salinity | Water salinity near the seafloor. Model output showing annual mean | World Ocean Database 200960 | psu | 0.25 dd | botsalin |
Bottom temperature | Water temperature near the seafloor. Model output showing annual mean | World Ocean Database 200960 | °C | 0.25 dd | bottemp |
Bottom type | Classed as ‘hard’ or ‘soft’ | n/a | 1 km2 | bottype | |
Distance to ports | Euclidian distance (GIS calculation by the present study). | World Port Index 2011 | dd | n/a | distport |
Distance to (major) river mouths | Euclidian distance (GIS calculation by the present study). | River mouth location from ESRI Data and Maps (2012) and 49 | dd | n/a | distriver |
Euphotic depth | Lee's euphotic depth. Annual mean from monthly climatologies (satellite telemetry). Prepared using MGET (Duke University) | Ocean Color Web | m | 0.0416 dd | zeumean |
Nutrient input | Based on mean annual use of fertilisers (from FAO statistics) and distributed across landscapes with dasymetric techniques. Transformed (0-1) | n/a | 1 km2 | nutrient | |
Phosphate concentration | Collected in situ at the sea surface | μmol.L−1 | 0.0833 dd | phosphate | |
Sea surface current | Absolute gridded geostrophic velocities of sea surface current showing annual mean from monthly climatologies (satellite telemetry) | Aviso SSALTO/DUACS | cm.sec−1 | 0.0129 dd | sscmean |
Silicate concentration | Collected in situ at the sea surface. Proxy for diatom phytoplankton growth | μmol.L−1 | 0.0833 dd | silicate | |
Slope of the seafloor | GIS calculation by the present study | Based on bathymetry layer of EMODNet Hydrography Portal | % | n/a | gebslo |
