Table 3 Oceanographic variables that explain 90% of the potential distribution Maxent models built for P. sverdrupi
Variable | Contribution to the model (%) | Cumulative contribution to the model (%) |
|---|---|---|
First model: historical distribution (pre-1990’s) | ||
Depth | 44 | 44 |
Presence of rocky coast | 18.9 | 62.9 |
Presence of rhodolith beds | 15 | 77.9 |
Primary productivity (max) | 4.1 | 82 |
Salinity (min) | 3.4 | 85.4 |
Nitrate concentration (min) | 3.2 | 88.6 |
Salinity range | 2 | 90.6 |
Second model: distribution after the first local extinctions | ||
Presence of rocky coast | 30.1 | 30.1 |
Depth | 25.4 | 55.5 |
Presence of rhodolith beds | 15.1 | 70.6 |
Salinity range | 4.9 | 75.5 |
Dissolved oxygen (max) | 4.8 | 80.3 |
Mean PAR | 3.8 | 84.1 |
Primary productivity (max) | 3.4 | 87.5 |
Alkalinity range | 3.4 | 90.9 |
Third model: distribution up to date | ||
Presence of rhodolith beds | 70.2 | 70.2 |
Presence of rocky coast | 13.1 | 83.3 |
Depth | 7.1 | 90.4 |