Sule Skerry and Sule Stack

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
European Storm-petrel Hydrobates pelagicus LC breeding 2001 309 breeding pairs B2, C6
Northern Gannet Morus bassanus LC breeding 1998 5,137 breeding pairs A4ii, B1ii, B2, C3
European Shag Gulosus aristotelis LC breeding 1998 724 breeding pairs B3
Atlantic Puffin Fratercula arctica VU breeding 1998 59,471 breeding pairs B1ii, B2, C3
A4iii Species group - seabirds n/a breeding 1998-2001 72,717 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 high very unfavourable low
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 happening now whole area/population (>90%) slow but significant deterioration high

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Hydrobates pelagicus European Storm-petrel 1000 309 breeding pairs 31 very unfavourable
Morus bassanus Northern Gannet 4890 5137 breeding pairs 100 favourable
Gulosus aristotelis European Shag 700 724 breeding pairs 100 favourable
Fratercula arctica Atlantic Puffin 43400 59471 breeding pairs 100 favourable
Species group - seabirds A4iii 63788 72717 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90%) covered by appropriate conservation designation A management plan exists but it is out of date or not comprehensive Very little or no conservation action taking place low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)
Sule Stack Site of Special Scientific Interest (UK) 2 protected area contained by site 3
Sule Skerry and Sule Stack Special Protection Area (Birds Directive) 3,909 protected area contains site 19
Sule Skerry and Sule Stack Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Sule Skerry Site of Special Scientific Interest (UK) 16 protected area overlaps with site 16


IUCN Habitat Habitat detail Extent (% of site)
Coastline Rock stacks and islets -
For further information about the habitat classification please click here.

Land use

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

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Sule Skerry and Sule Stack. Downloaded from on 30/09/2022.