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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
European Storm-petrel Hydrobates pelagicus	LC	breeding (1996)	6,800 pairs	A4ii, B1ii, B2, C2, C6

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.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Climate change and severe weather	happe­ning now	whole of popul­ation/area (>90%)	rapid decline (>30% over 3 gener­ations)	very high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	A management plan exists, but it is out of date or not compre­hensive	Unknown	low

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Mousa	RSPB Reserve (-)	100
1961	Mousa	Site of Special Scientific Interest (UK) (IV)	100
2001	Mousa	Nature Reserve (II)	86
2005	Mousa	Marine Protected Area (OSPAR) (UA)	25
2014	Mousa to Boddam	Marine Protected Area (OSPAR) (UA)	15

Habitat	% of IBA	Habitat detail
Grassland	major (>10)	Mesophile grasslands; Humid grasslands
Marine Coastal/Supratidal	minor (<10)
Marine Intertidal	minor (<10)
Marine Neritic	minor (<10)
Shrubland	minor (<10)	Heathland

Land use	% of IBA
agriculture	100

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Mousa (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/mousa-iba-united-kingdom on 24/12/2024.