Blasket Islands

IBA Criteria

Year of most recent IBA criteria assessment: 2009

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
European Storm-petrel Hydrobates pelagicus LC breeding 2000 31,550-36,124 breeding pairs A4ii, B1ii, B3, C2, C6
Manx Shearwater Puffinus puffinus LC breeding 2000 10,883-29,844 breeding pairs A4ii, B1ii, B2, C3
Great Black-backed Gull Larus marinus LC breeding 1999 114 breeding pairs B3
A4iii Species group - seabirds n/a breeding 1999-2001 50,000-99,999 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)
2013 very high not assessed low
Was the whole site covered? Yes State assessed by unset
Accuracy of information unknown

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities happening now whole area/population (>90%) very rapid to severe deterioration very high
Invasive and other problematic species and genes invasive non-native/alien species/diseases - unspecified species happening now whole area/population (>90%) very rapid to severe deterioration very high
Transportation and service corridors roads and railroads happening now whole area/population (>90%) very rapid to severe deterioration very high

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation No management planning has taken place Some limited conservation initiatives are in place low
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Terraght Island (Marine) Nature Reserve 19 protected area contained by site 19
Tearaght Island Nature Reserve 46 protected area contained by site 27
Blasket Islands SPA Special Protection Area (Birds Directive) 3,620 protected area contains site 1,022
Blasket Islands SAC Site of Community Importance (Habitats Directive) 22,702 protected area contains site 3,238
Blasket IslandS Marine Protected Area (OSPAR) 22,700 protected area contains site 0


IUCN Habitat Habitat detail Extent (% of site)
Grassland Dry siliceous grassland -
Coastline Sea cliffs and rocky shores, Rock stacks and islets -
For further information about the habitat classification please click here.

Land use

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

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Blasket Islands. Downloaded from on 25/09/2022.