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The site was identified as important in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Great Cormorant Phalacrocorax carbo	LC	breeding	2001-2005	542 breeding pairs	B1i, C3

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2007) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2007) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Great Cormorant Phalacrocorax carbo	705	542	breeding pairs	77	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Pollution	happening now	whole area/population (>90%)	slow but significant deterioration	high
Biological resource use	happening now	whole area/population (>90%)	slow but significant deterioration	high
Energy production and mining	likely in short term (within 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Climate change and severe weather	likely in long term (beyond 4 years)	whole area/population (>90%)	slow but significant deterioration	medium
Invasive and other problematic species and genes	past (and unlikely to return) and no longer limiting	some of area/population (10-49%)	slow but significant deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
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

Year	Protected Area	Designation	% overlap with IBA
1967	Ynys Mon / Anglesey	Area of Outstanding Natural Beauty	100
1975	Puffin Island - Ynys Seiriol	Site of Special Scientific Interest (UK)	100
1999	Ynys Seiriol / Puffin Island	Special Protection Area (Birds Directive)	100
2005	Y Fenai a Bae Conwy / Menai Strait and Conwy Bay	Marine Protected Area (OSPAR)	35
2011	Liverpool Bay / Bae Lerpwl	Marine Protected Area (OSPAR)	35

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Ynys Seiriol/Puffin Island (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/ynys-seiriol-puffin-island-iba-united-kingdom on 23/11/2024.