• Summary
• Text account
• Data table and detailed info
• Map
• 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
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

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
Smew Mergellus albellus	28	67	individuals	100	favourable
Northern Shoveler Spatula clypeata	645	355	individuals	56	unfavourable
Gadwall Mareca strepera	580	495	individuals	86	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Residential and commercial development	happening now	small area/few individuals (<10%)	slow but significant deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other 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

Year	Protected Area	Designation	% overlap with IBA
1984	Staines Moor	Site of Special Scientific Interest (UK)	26
1992	Wraysbury & Hythe End Gravel Pits	Site of Special Scientific Interest (UK)	5
1993	South West London Waterbodies	Special Protection Area (Birds Directive)	44
1999	Wraysbury Reservoir	Site of Special Scientific Interest (UK)	11
1999	Knight & Bessborough Reservoirs	Site of Special Scientific Interest (UK)	3
1999	Wraysbury No 1 Gravel Pit	Site of Special Scientific Interest (UK)	2
1999	Thorpe Park No 1 Gravel Pit	Site of Special Scientific Interest (UK)	2
1999	Kempton Park Reservoirs	Site of Special Scientific Interest (UK)	1
2000	South West London Waterbodies	Ramsar Site, Wetland of International Importance	44
2000	Kempton Nature Reserves	Local Nature Reserve	1

Habitat1	Habitat detail	% of IBA
Forest	Mixed woodland	-
Grassland		-
Shrubland	Scrub	-
Wetlands (inland)	Standing freshwater, Rivers and streams	-

1. IUCN Habitat classification.

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 23/11/2024.