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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
Roseate Tern Sterna dougallii	LC	breeding	2000	2 breeding pairs	C6
Roseate Tern Sterna dougallii	LC	breeding	2006	2 breeding pairs	C6
Common Tern Sterna hirundo	LC	breeding	2000	184 breeding pairs	C6
Common Tern Sterna hirundo	LC	breeding	2006	429 breeding pairs	C6
Arctic Tern Sterna paradisaea	LC	breeding	2000	1,705 breeding pairs	C2, C6
Arctic Tern Sterna paradisaea	LC	breeding	2006	2,726 breeding pairs	C2, C6
Sandwich Tern Thalasseus sandvicensis	LC	breeding	2000	450 breeding pairs	B2, C2, C6
Sandwich Tern Thalasseus sandvicensis	LC	breeding	2006	1,273 breeding pairs	A4i, B1i, B2, C2, C6

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
Roseate Tern Sterna dougallii	10	2	breeding pairs	20	not assessed
Common Tern Sterna hirundo	125	429	breeding pairs	100	favourable
Arctic Tern Sterna paradisaea	1,280	2,726	breeding pairs	100	favourable
Sandwich Tern Thalasseus sandvicensis	650	1,273	breeding pairs	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Human intrusions and disturbance	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Invasive and other problematic species and genes	happening now	some of area/population (10-49%)	moderate to rapid 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)	small area/few individuals (<10%)	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	A management plan exists but it is out of date or not comprehensive	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	medium

Year	Protected Area	Designation	% overlap with IBA
-	The Skerries	RSPB Reserve	21
1957	Cemlyn Bay	Site of Special Scientific Interest (UK)	51
1957	The Skerries	Site of Special Scientific Interest (UK)	20
1961	Ynys Feurig	Site of Special Scientific Interest (UK)	29
1967	Ynys Mon / Anglesey	Area of Outstanding Natural Beauty	69
1968	Cemlyn Estate	Nature Reserve	26
1973	North Anglesey	Heritage Coast	28
1983	The Skerries	Nature Reserve	7
2000	Bae Cemlyn/ Cemlyn Bay	Site of Community Importance (Habitats Directive)	50
2000	Anglesey Terns / Morwenoliaid Ynys Môn	Special Protection Area (Birds Directive)	100
2017	North Anglesey Marine / Gogledd Môn Forol	Site of Community Importance (Habitats Directive)	15

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		major (>10)
Marine Intertidal		major (>10)

1. IUCN Habitat classification.

Land use	% of IBA
not utilised	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Ynys Feurig, Cemlyn Bay and the Skerries (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/ynys-feurig-cemlyn-bay-and-the-skerries-iba-united-kingdom on 23/11/2024.