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Year of most recent IBA criteria assessment: 2007

Populations of IBA trigger species

Species	Current IUCN Red List Category	Season	Year(s) of estimate	Population at site	IBA criteria triggered
Smew Mergellus albellus	LC	winter	2001-2006	67 individuals	C6
Northern Shoveler Spatula clypeata	LC	passage	2001-2006	489 individuals	B1i, C3
Gadwall Mareca strepera	LC	passage	2001-2006	689 individuals	B1i, C3
Gadwall Mareca strepera	LC	winter	2001-2006	495 individuals	B1i, C3

Note: The current IUCN Red List category may differ from the category that was valid at the time of IBA criteria assessment.

For more information about the IBA criteria, please click here

Threats to the site (pressure)
Threat level 1	Threat level 2	Timing	Scope	Severity	Result
Residential and commercial development	commercial and industrial development	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Residential and commercial development	tourism and recreation areas	happening now	small area/few individuals (<10%)	slow but significant deterioration	low

Condition of the site (state), by species
Scientific name	Common name	Reference population	Actual population	Units	% of population remaining	Result
Mergellus albellus	Smew	28	67	individuals	100	favourable
Spatula clypeata	Northern Shoveler	645	355	individuals	56	unfavourable
Mareca strepera	Gadwall	580	495	individuals	86	near favourable

Conservation actions taken at the site (response)
Protected-area designation	Management planning	Other conservation action	Result
Most of site (50-90%) covered (including the most critical parts for important bird species)	No management plan exists but the management planning process has begun	Very little or no conservation action taking 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)
Wraysbury Reservoir	Site of Special Scientific Interest (UK)	205	protected area overlaps with site	205
Wraysbury No 1 Gravel Pit	Site of Special Scientific Interest (UK)	58	protected area overlaps with site	0
Wraysbury & Hythe End Gravel Pits	Site of Special Scientific Interest (UK)	117	protected area overlaps with site	95
Thorpe Park No 1 Gravel Pit	Site of Special Scientific Interest (UK)	43	protected area overlaps with site	0
Staines Moor	Site of Special Scientific Interest (UK)	511	protected area overlaps with site	480
South West London Waterbodies	Ramsar Site, Wetland of International Importance	828	protected area overlaps with site	828
South West London Waterbodies	Special Protection Area (Birds Directive)	825	protected area contained by site	828
Knight & Bessborough Reservoirs	Site of Special Scientific Interest (UK)	63	protected area overlaps with site	0
Kempton Park Reservoirs	Site of Special Scientific Interest (UK)	25	protected area overlaps with site	0
Kempton Nature Reserves	Local Nature Reserve	23	protected area overlaps with site	0

IUCN Habitat	Habitat detail	Extent (% of site)
Forest	Mixed woodland	-
Shrubland	Scrub	-
Grassland		-
Wetlands (inland)	Standing freshwater, Rivers and streams	-

For further information about the IUCN habitat classification, please click here.

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

For further information about the land-use classification, please click here.

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: South-west London Waterbodies. Downloaded from http://datazone.birdlife.org/site/factsheet/2600 on 01/06/2023.