Table 2. Percentage of area cover and opportunity cost when planning at different spatial scales.
| Ecoregion | Area % | Cost % | ||
| Scenario a | Scenario b | Scenario a | Scenario b | |
| Alboran Sea | 0 | 4 | 0 | 3 |
| Algero-Provencal Basin | 5 | 14 | 0.4 | 3 |
| Tyrrhenian Sea | 8 | 14 | 2 | 5 |
| Tunisian Plateau/Gulf of Sidra | 1 | 3 | 0.3 | 2 |
| Adriatic Sea | 15 | 12 | 12 | 6 |
| Ionian Sea | 25 | 23 | 10 | 7 |
| Aegean Sea | 23 | 17 | 10 | 6 |
| Levantine Sea | 11 | 9 | 6 | 3 |
| Mediterranean Sea | 10.76 | 11.25 | 1.45 | 3.41 |
Percentage area cover and percentage opportunity cost of planning units required in each ecoregion of the Mediterranean Sea for scenarios a and b (scenario a: selection of priority areas across the whole Mediterranean Sea, and b: selection of priority areas for each ecoregion separately).