UK088
Glannau Aberdaron and Ynys Enlli


IBA Justification

The site was identified as important in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
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

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2007).


IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2007 favourable medium medium
Was the whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Puffinus puffinus Manx Shearwater 4300 16183 breeding pairs 100 favourable
Pyrrhocorax pyrrhocorax Red-billed Chough 19 18 breeding pairs 95 favourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Energy production and mining renewable energy likely in long term (beyond 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation 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90%) covered by appropriate conservation designation A management plan exists but it is out of date or not comprehensive Some limited conservation initiatives are in place medium
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Ynysoedd y Gwylanod: Gwylan Islands Site of Special Scientific Interest (UK) 5 protected area overlaps with site 0
Ynys Enlli: Bardsey Island Site of Special Scientific Interest (UK) 206 protected area overlaps with site 201
Ynys Enlli (bardsey) National Nature Reserve 179 protected area overlaps with site 179
West Wales Marine / Gorllewin Cymru Forol Site of Community Importance (Habitats Directive) 737,614 protected area overlaps with site 0
Uwchmynydd Nature Reserve 162 protected area overlaps with site 0
Porthor Nature Reserve 30 protected area overlaps with site 0
Pen Llŷn a`r Sarnau/ Lleyn Peninsula and the Sarnau Site of Community Importance (Habitats Directive) 146,011 protected area overlaps with site 66
Pen Llyn a`r Sarnau / Lleyn Peninsula and the Sarnau Marine Protected Area (OSPAR) 144,100 protected area overlaps with site 0
Llyn Coast Heritage Coast 20 protected area overlaps with site 326
Llyn Area of Outstanding Natural Beauty 15,984 protected area overlaps with site 0
Lleyn (Llyn) Area of Outstanding Natural Beauty 0 protected area overlaps with site 488
Glannau Aberdaron and Ynys Enlli / Aberdaron Coast and Bardsey Island Marine Protected Area (OSPAR) 33,500 protected area overlaps with site 0
Glannau Aberdaron ac Ynys Enlli/ Aberdaron Coast and Bardsey Island Special Protection Area (Birds Directive) 33,942 protected area contains site 507
Glannau Aberdaron Site of Special Scientific Interest (UK) 304 protected area overlaps with site 358
Cwrt, Henfaes and Porth Simdde Nature Reserve 12 protected area overlaps with site 0
Clogwyni Pen Llŷn/ Seacliffs of Lleyn Site of Community Importance (Habitats Directive) 1,045 protected area overlaps with site 170

Habitats

Habitat (IUCN level 1) Habitat detail Extent (% of site)
Shrubland Heathland -
Grassland -
Wetlands (inland) Fens, transition mires and springs -
Marine Coastal/Supratidal -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
agriculture -
nature conservation and research -
tourism/recreation -


Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Glannau Aberdaron and Ynys Enlli. Downloaded from https://datazone.birdlife.org/site/factsheet/glannau-aberdaron-and-ynys-enlli-iba-united-kingdom on 04/03/2024.