• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

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
Smew Mergellus albellus	LC	winter (2001–2006)	67 birds	C6
Northern Shoveler Spatula clypeata	LC	passage (2001–2006)	489 birds	B1i, C3
Gadwall Mareca strepera	LC	passage (2001–2006)	689 birds	B1i, C3
Gadwall Mareca strepera	LC	winter (2001–2006)	495 birds	B1i, C3

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	Actual vs Reference (units)	% remaining	Result
Smew Mergellus albellus	67 / 28 (birds)	100	good
Northern Shoveler Spatula clypeata	355 / 645 (birds)	56	poor
Gadwall Mareca strepera	495 / 580 (birds)	86	moderate

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Residential and commercial development	happe­ning now	few indivi­duals/small area (<10%)	slow decline (1–10% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Most of area (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

Year	Protected Area	Designation (management category)	% coverage of IBA
1984	Staines Moor	Site of Special Scientific Interest (UK) (IV)	26
1992	Wraysbury & Hythe End Gravel Pits	Site of Special Scientific Interest (UK) (IV)	5
1999	Wraysbury Reservoir	Site of Special Scientific Interest (UK) (IV)	11
1999	Knight & Bessborough Reservoirs	Site of Special Scientific Interest (UK) (IV)	3
1999	Wraysbury No 1 Gravel Pit	Site of Special Scientific Interest (UK) (IV)	2
1999	Thorpe Park No 1 Gravel Pit	Site of Special Scientific Interest (UK) (IV)	2
1999	Kempton Park Reservoirs	Site of Special Scientific Interest (UK) (IV)	1
2000	Kempton Nature Reserves	Local Nature Reserve (IV)	1

Habitat	% of IBA	Habitat detail
Forest	-	Mixed woodland
Grassland	-
Shrubland	-	Scrub
Wetlands (inland)	-	Standing freshwater; Rivers and streams

Land use	% of IBA
nature conservation and research	-
tourism/recreation	-
water management	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: South-west London Waterbodies (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/south-west-london-waterbodies-iba-united-kingdom on 26/12/2024.