Data Zone
The site was identified as internationally important for bird conservation in 2007 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.
Populations meeting IBA criteria ('key species') at the site:| Species | Red List | Season (year/s of estimate) | Size | IBA criteria |
|---|---|---|---|---|
| Manx Shearwater Puffinus puffinus | LC | breeding (2001) | 16,183 breeding pairs | A4ii, B1ii, B2, C3 |
| Peregrine Falcon Falco peregrinus | LC | resident (1995) | 12 breeding pairs | C6 |
| Red-billed Chough Pyrrhocorax pyrrhocorax | LC | resident (1999–2004) | 18 breeding pairs | B2, C6 |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2007) is shown below.
| IBA conservation status | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2007 | favourable | medium | medium |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | good | |
| State (condition of the key species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Manx Shearwater Puffinus puffinus | 16,183 / 4,300 (breeding pairs) | 100 | favourable | ||
| Red-billed Chough Pyrrhocorax pyrrhocorax | 18 / 19 (breeding pairs) | 95 | favourable | ||
| Pressure (threats to the key species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Agricultural expansion and intensification | likely in short term (within 4 years) | some of population/area (10–49%) | moderate deterioration (10–30% in 3 generations) | medium |
| Human intrusions and disturbance | likely in short term (within 4 years) | some of population/area (10–49%) | moderate deterioration (10–30% in 3 generations) | medium |
| Energy production and mining | likely in long term (beyond 4 years) | some of population/area (10–49%) | moderate deterioration (10–30% in 3 generations) | medium |
| Response (conservation actions taken for the key species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Whole area of site (>90%) covered by appropriate conservation designation | A management plan exists, but it is out of date or not comprehensive | Some limited conservation initiatives are in place | medium |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 1951 | Porthor | Nature Reserve (V) | 4 |
| 1954 | Uwchmynydd | Nature Reserve (V) | 27 |
| 1957 | Llyn | Area of Outstanding Natural Beauty (V) | 89 |
| 1957 | Glannau Aberdaron | Site of Special Scientific Interest (UK) (IV) | 71 |
| 1957 | Ynys Enlli: Bardsey Island | Site of Special Scientific Interest (UK) (IV) | 40 |
| 1957 | Lleyn (Llyn) | Area of Outstanding Natural Beauty (V) | - |
| 1980 | Ynysoedd y Gwylanod: Gwylan Islands | Site of Special Scientific Interest (UK) (IV) | <1 |
| 1986 | Ynys Enlli (bardsey) | National Nature Reserve (IV) | 35 |
| 1990 | Cwrt, Henfaes and Porth Simdde | Nature Reserve (V) | <1 |
| 2005 | Pen Llyn a`r Sarnau / Lleyn Peninsula and the Sarnau | Marine Protected Area (OSPAR) (UA) | 13 |
| 2015 | Glannau Aberdaron and Ynys Enlli / Aberdaron Coast and Bardsey Island | Marine Protected Area (OSPAR) (UA) | 14 |
| 2017 | West Wales Marine / Gorllewin Cymru Forol | Site of Community Importance (Habitats Directive) (UA) | 11 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Grassland | - | |
| Marine Coastal/Supratidal | - | |
| Shrubland | - | Heathland |
| Wetlands (inland) | - | Fens, transition mires and springs |
| Land use | % of IBA |
|---|---|
| agriculture | - |
| nature conservation and research | - |
| tourism/recreation | - |
Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Glannau Aberdaron and Ynys Enlli (United Kingdom). Downloaded from
https://datazone.birdlife.org/site/factsheet/glannau-aberdaron-and-ynys-enlli-iba-united-kingdom on 14/01/2025.