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
Roseate Tern Sterna dougallii LC breeding 2000 618 breeding pairs B1i, B2, C2, C6
Common Tern Sterna hirundo LC breeding 1999 610 breeding pairs B1i, C2, C6
Arctic Tern Sterna paradisaea LC breeding 1999 89 breeding pairs C6
Black Guillemot Cepphus grylle LC breeding 1998 83 individuals B2

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)
2009 high favourable medium
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
Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale likely in short term (within 4 years) majority/most of area/population (50-90%) very rapid to severe deterioration high
Invasive and other problematic species and genes problematic native species/diseases - named species happening now small area/few individuals (<10%) moderate to rapid deterioration low

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Larus argentatus 150 16 nests 11 not assessed
Sterna dougallii Roseate Tern 180 618 nests 100 favourable
Sterna hirundo Common Tern 108 610 nests 100 favourable
Sterna paradisaea Arctic Tern 2 89 nests 100 not assessed
Cepphus grylle Black Guillemot 40 83 individuals 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 No management plan exists but the management planning process has begun Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Rockabill to Dalkey Island SAC Site of Community Importance (Habitats Directive) 27,314 protected area overlaps with site 0
Rockabill SPA Special Protection Area (Birds Directive) 5,227 protected area contains site 2
Rockabill Island Refuge for Fauna 1 protected area contains site 1


IUCN Habitat Habitat detail Extent (% of site)
Shrubland Scrub -
Sea Sea inlets and coastal features -
Coastline Rock stacks and islets -
Artificial/Terrestrial Other urban and industrial areas -
Marine Neritic -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
urban/industrial/transport -
nature conservation and research -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Rockabill. Downloaded from on 01/04/2023.