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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'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Little Gull Hydrocoloeus minutus	LC	non-breeding	1994-1995	2,000 individuals	A4i, B1i, C3

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2007).

State (condition of the trigger species' populations)
Scientific name	Common name	Reference population	Actual population	Units	% of population remaining	Result
Branta leucopsis	Barnacle Goose	185	115	individuals	63	unfavourable
Mareca strepera	Gadwall	300	191	individuals	64	unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1	Threat level 2	Timing	Scope	Severity	Result
Energy production and mining	renewable energy	likely in short term (within 4 years)	small area/few individuals (<10%)	moderate to rapid deterioration	low
Natural system modifications	dams & water management/use - abstraction of surface water (agricultural use)	likely in short term (within 4 years)	small area/few individuals (<10%)	slow but significant deterioration	low
Natural system modifications	other ecosystem modifications	happening now	small area/few individuals (<10%)	slow but significant deterioration	low
Pollution	agricultural & forestry effluents - nutrient loads	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Pollution	domestic & urban waste water - sewage	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other conservation action	Result
Whole area of site (>90%) covered by appropriate conservation designation	Unknown	Some limited conservation initiatives are in place	low

For more information about IBA conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Hornsea Mere	Site of Special Scientific Interest (UK)	232	protected area overlaps with site	231
Hornsea Mere	Special Protection Area (Birds Directive)	232	is identical to site	231

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Forest	Broadleaved deciduous woodland, Alluvial and very wet forest	-
Wetlands (inland)	Standing freshwater, Water fringe vegetation, Fens, transition mires and springs	-

For more information about the IUCN Habitat classification, please click here.

Land-use	Extent (% of site)
agriculture	-
fisheries/aquaculture	-
nature conservation and research	-
tourism/recreation	-
water management	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Hornsea Mere. Downloaded from http://datazone.birdlife.org/site/factsheet/hornsea-mere-iba-united-kingdom on 10/12/2023.