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• Reference and further resources

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
Whimbrel Numenius phaeopus	LC	breeding	1994	23 breeding pairs	C7
Arctic Jaeger Stercorarius parasiticus	LC	breeding	2002	34 breeding pairs	C7

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
Arctic Jaeger Stercorarius parasiticus	42	34	breeding pairs	81	near favourable

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

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	Unknown	Not assessed	low

Year	Protected Area	Designation	% overlap with IBA
1986	Crussa Field and the Heogs	Site of Special Scientific Interest (UK)	100

Habitat1	Habitat detail	% of IBA
Shrubland	Heathland	90
Rocky areas (eg. inland cliffs, mountain peaks)		10

1. IUCN Habitat classification.

Land use	% of IBA
agriculture	100

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Crussa Field and the Heogs (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/crussa-field-and-the-heogs-iba-united-kingdom on 24/11/2024.