Table 2.
Characteristics and environmental variables of the studied populations. n number of samples used for every population, S island surface area in hectares, predation indexes absence of terrestrial predators = 0; one occasional predators in the island = 1; one widespread predator was or is present in the island = 2; two frequent predators present in the island = 3, human pressure uninhabited island and very difficult access = 0; sporadic human presence and easy access = 1; regular human presence and easy access = 2; previous permanent human presence with constructions but with an actual protection = 3; present and past human presence = 4.
| Population | n | Population size (N) | S (ha) | Biotic capacity | Vascular plants | Predation | Human pressure | Rats | Seagulls |
|---|---|---|---|---|---|---|---|---|---|
| Menorca | |||||||||
| Aire | 12 | 77,500 | 29.8 | 6.10 | 94 | 0 | 2 | No | Yes |
| Colom | 10 | 58,107 | 51.14 | 7.62 | 267 | 1 | 3 | Yes | Yes |
| Porros | 10 | 54 | 0.05 | −2.66 | 32 | 0 | 1 | No | No |
| Rei | 10 | 1845 | 4.08 | 4.08 | 204 | 2 | 4 | Yes | No |
| Cabrera | |||||||||
| Cabrera (harbour) | 12 | 534,888 | 1137.24 | 12.18 | 486 | 3 | 3 | Yes | Yes |
| Cabrera (lighthouse) | 10 | 5171 | 10.6 | 7.16 | 486 | 3 | 2 | Yes | Yes |
| Esclatasang | 11 | 714 | 0.42 | 2.69 | 23 | 0 | 0 | No | Yes |
| Foradada | 10 | 1356 | 1.61 | 3.77 | 19 | 0 | 1 | No | Yes |
| Mallorca | |||||||||
| Dragonera | 4 | 132,875 | 267.81 | 11.29 | 300 | 0 | 2 | Yes | Yes |
| Colomer | 4 | 10,017 | 3.05 | 5.74 | 8 | 0 | 0 | No | Yes |