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Location United Kingdom, Wales
Central coordinates 4o 1.70' West  53o 19.12' North
IBA criteria B1i, C3
Area 31 ha
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description Rocky island on the north Wales coast, important for breeding Phalacrocorax carbo.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Great Cormorant Phalacrocorax carbo breeding  2001-2005  542 breeding pairs  good  B1i, C3  Least Concern 

IBA Monitoring

2007 high near favourable low
Good - based on reliable and complete / representative data

Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale happening now whole area/population (>90%) slow but significant deterioration high
Climate change and severe weather habitat shifting and alteration likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Energy production and mining renewable energy likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species past (and unlikely to return) and no longer limiting some of area/population (10-49%) slow but significant deterioration low
Pollution industrial & military effluents - type unknown/unrecorded happening now whole area/population (>90%) slow but significant deterioration high

Phalacrocorax carbo Great Cormorant 705 542 breeding pairs 77 near favourable

Whole area of site (>90%) covered by appropriate conservation designation  No management plan exists but the management planning process has begun  Some limited conservation initiatives are in place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Anglesey Area of Outstanding Natural Beauty 22,100 protected area contains site 31  
Puffin Island - Ynys Seiriol Site of Special Scientific Interest 32 is identical to site 31  


IUCN habitat Habitat detail Extent (% of site)
Coastline Rock stacks and islets; Sea cliffs and rocky shores  major

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Ynys Seiriol/Puffin Island. Downloaded from on 28/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife