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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
Red-billed Chough Pyrrhocorax pyrrhocorax	LC	breeding (2001–2004)	4 pairs	B2, 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
No known threats	happe­ning now	few indivi­duals/small area (<10%)	no or slight decline (<1% over 3 gener­ations)	low

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90%) covered by appropriate conservation designation	A management plan exists, but it is out of date or not compre­hensive	Substantive conservation measures are being implemented, but these are not compre­hensive and are limited by resources and capacity	medium

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Oronsay	RSPB Reserve (-)	27
1971	Oronsay and South Colonsay	Site of Special Scientific Interest (UK) (IV)	83
1997	Oronsay	Nature Reserve (IV)	27

Habitat	% of IBA	Habitat detail
Artificial/Terrestrial	major (>10)	Arable land
Marine Coastal/Supratidal	major (>10)
Grassland	minor (<10)
Marine Intertidal	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Oronsay and South Colonsay (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/oronsay-and-south-colonsay-iba-united-kingdom on 23/12/2024.