Ailsa Craig

IBA Criteria

Year of most recent IBA criteria assessment: 2007

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Northern Gannet Morus bassanus LC breeding 1999 35,825 breeding pairs A4ii, B1ii, B2, C3
A4iii Species group - seabirds n/a breeding 1999-2001 43,348 breeding pairs A4iii, C4

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2007 medium favourable high
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Climate change and severe weather habitat shifting and alteration likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Morus bassanus Northern Gannet 32500 35825 breeding pairs 100 favourable
Larus fuscus Lesser Black-backed Gull 1500 400 breeding pairs 27 not assessed
Species group - seabirds A4iii 36664 43348 breeding pairs 100 favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species The conservation measures needed for the site are being comprehensively and effectively implemented high
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Ailsa Craig Site of Special Scientific Interest (UK) 100 protected area overlaps with site 99
Ailsa Craig Special Protection Area (Birds Directive) 2,760 protected area contains site 99
Ailsa Craig Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Ailsa Craig Nature Reserve 99 protected area overlaps with site 0
Ailsa Craig RSPB Reserve 99 is identical to site 99


IUCN Habitat Habitat detail Extent (% of site)
Coastline Sea cliffs and rocky shores -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
not utilised -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Ailsa Craig. Downloaded from on 02/04/2023.