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Grassholm
| Location | United Kingdom, Wales |
| Central coordinates | 5o 28.79' West 51o 43.85' North |
| IBA criteria | A4ii, A4iii, B1ii, B2, C3, C4 |
| Area | 11 ha |
| Altitude | 0 - 15m |
| Year of IBA assessment | 2007 |
Royal Society for the Protection of Birds
Site description A low-lying, flat-topped basalt island situated about 18 km west of the mainland Dyfed coast. Vegetation is limited by exposure to wind, salt spray and the large numbers of seabirds. The site is important for its seabird colonies, including a very large gannetry.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Northern Gannet Morus bassanus | breeding | 2004 | 32,094 breeding pairs | poor | A4ii, B1ii, B2, C3 | Least Concern |
| A4iii Species group - seabirds | breeding | 1999-2001 | 31,611 breeding pairs | poor | A4iii, C4 |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Grassholm | Birds Directive | 11 | is identical to site | 11 |
|
| Grassholm | National Nature Reserve | 11 | is identical to site | 11 |
|
| Grassholm | RSPB Reserve | 11 | is identical to site | 11 | |
| Grassholm/ynys Gwales | Site of Special Scientific Interest | 11 | is identical to site | 9 |
|
| Pembrokeshire Coast National Park | National Park | 0 | protected area contains site | 11 | |
| Pembrokeshire Marine/Sir Benfro Forol | Habitats Directive | 132,174 | protected area contains site | 11 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Grassland | - | |
| Coastline | Rock stacks and islets; Sea cliffs and rocky shores | - |
Land use
| Land-use | Extent (% of site) |
|---|---|
| nature conservation and research | - |
| tourism/recreation | - |
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Grassholm. Downloaded from http://www.birdlife.org on 21/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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