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close| Location | Spain, Galicia |
| Central coordinates | 8o 57.00' West 42o 23.00' North |
| IBA criteria | A4i, B1i, B3, C3 |
| Area | 500 ha |
| Altitude | 0 - 119m |
| Year of IBA assessment | 2000 |
Ornithological information This is an important site for breeding seabirds.
Site description Two small islands in the Ría de Pontevedra estuary, covered by scrub and grasslands. The main human activity is tourism.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| European Shag Phalacrocorax aristotelis | resident | 1992 | 400-600 breeding pairs | medium | B3 | Least Concern |
| Yellow-legged Gull Larus michahellis | resident | 1992 | 2,000 breeding pairs | poor | A4i, B1i, C3 | Least Concern |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Complexo Ons - O Grove - ES1140004 | Habitats Directive | 7,507 | protected area overlaps with site | 300 | |
| Illa de Ons - ES0000254 | Birds Directive | 924 | protected area contained by site | 263 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Shrubland | Scrub | 26% |
| Sea | - | |
| Coastline | Rock stacks and islets; Sea cliffs and rocky shores | 26% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| fisheries/aquaculture | - |
| not utilised | 26% |
| tourism/recreation | - |
Management considerations The main threats are from tourism and fires. The regional government is in charge of management and restricts tourist visits to protect seabirds.
Protection status National None International None
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Ons islands. Downloaded from http://www.birdlife.org on 25/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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