UK072
Thames Basin Heaths


IBA Criteria

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 estimate IBA Criteria Triggered
European Nightjar Caprimulgus europaeus LC breeding 2004 365 males B2, C6
Woodlark Lullula arborea LC resident 2006 220 males C6
Dartford Warbler Curruca undata NT resident 2006 387 males C6

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here


IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2007 high favourable medium
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming happening now some of area/population (10-49%) slow but significant deterioration medium
Agricultural expansion and intensification wood and pulp plantations (includes afforestation) - agro-industry plantations happening now small area/few individuals (<10%) slow but significant deterioration low
Agricultural expansion and intensification wood and pulp plantations (includes afforestation) - agro-industry plantations happening now small area/few individuals (<10%) slow but significant deterioration low
Human intrusions and disturbance war, civil unrest and military exercises happening now small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development housing and urban areas happening now some of area/population (10-49%) moderate to rapid deterioration high
Residential and commercial development tourism and recreation areas happening now some of area/population (10-49%) slow but significant deterioration medium

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Caprimulgus europaeus European Nightjar 155 365 males 100 favourable
Lullula arborea Woodlark 67 220 males 100 favourable
Curruca undata Dartford Warbler 115 387 males 100 favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Most of site (50-90%) covered (including the most critical parts for important bird species) A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Whitmoor Common Site of Special Scientific Interest (UK) 166 protected area overlaps with site 0
Whitmoor & Rickford Commons Local Nature Reserve 185 protected area overlaps with site 0
West Minley Meadow Site of Special Scientific Interest (UK) 4 protected area overlaps with site 0
Wasing Wood Ponds Site of Special Scientific Interest (UK) 14 protected area overlaps with site 0
Thursley; Ash, Pirbright And Chobham Site of Community Importance (Habitats Directive) 5,154 protected area overlaps with site 0
Thames Basin Heaths Special Protection Area (Birds Directive) 8,311 protected area contained by site 8,275
Swinley Park and Brick Pits Site of Special Scientific Interest (UK) 89 protected area overlaps with site 0
Snelsmore Common Site of Special Scientific Interest (UK) 104 protected area overlaps with site 0
Smart's and Prey Heaths Site of Special Scientific Interest (UK) 39 protected area overlaps with site 0
Sandhurst To Owlsmoor Bogs and Heaths Site of Special Scientific Interest (UK) 86 protected area overlaps with site 0
Pamber Forest and Silchester Common Site of Special Scientific Interest (UK) 342 protected area overlaps with site 0
Pamber Forest Local Nature Reserve 190 protected area overlaps with site 0
Padworth Common Local Nature Reserve 30 protected area overlaps with site 0
Ockham and Wisley Commons Site of Special Scientific Interest (UK) 266 protected area overlaps with site 0
Ockham and Wisley Local Nature Reserve 333 protected area overlaps with site 0
North Wessex Downs Area of Outstanding Natural Beauty 173,228 protected area overlaps with site 0
King's Copse Site of Special Scientific Interest (UK) 14 protected area is adjacent to site 0
Horsell Common Site of Special Scientific Interest (UK) 152 protected area overlaps with site 0
Heath Brow Site of Special Scientific Interest (UK) 2 protected area overlaps with site 0
Hazeley Heath Nature Reserve 109 protected area overlaps with site 0
Hazeley Heath Site of Special Scientific Interest (UK) 181 protected area overlaps with site 0
Greenham and Crookham Commons Site of Special Scientific Interest (UK) 281 protected area overlaps with site 0
Foxlease and Ancells Meadows Site of Special Scientific Interest (UK) 69 protected area is adjacent to site 0
Fox Corner Local Nature Reserve 6 protected area overlaps with site 0
Finchampstead Ridges Nature Reserve 55 protected area overlaps with site 0
Eelmoor Marsh Site of Special Scientific Interest (UK) 66 protected area overlaps with site 0
Decoy Pit , Pools & Woods Site of Special Scientific Interest (UK) 18 protected area overlaps with site 0
Colony Bog and Bagshot Heath Site of Special Scientific Interest (UK) 1,131 protected area overlaps with site 1,127
Chobham Common National Nature Reserve 520 protected area overlaps with site 0
Chobham Common Site of Special Scientific Interest (UK) 656 protected area overlaps with site 651
Castle Bottom To Yateley Common and Hawley Commons Site of Special Scientific Interest (UK) 923 protected area overlaps with site 0
Castle Bottom National Nature Reserve 31 protected area overlaps with site 0
Broadmoor To Bagshot Woods and Heaths Site of Special Scientific Interest (UK) 1,697 protected area overlaps with site 1,715
Brentmoor Heath Local Nature Reserve 29 protected area overlaps with site 0
Bramshill Site of Special Scientific Interest (UK) 674 protected area overlaps with site 0
Bourley and Long Valley Site of Special Scientific Interest (UK) 824 protected area overlaps with site 820
Bisley & West End Commons Local Nature Reserve 37 protected area overlaps with site 0
Basingstoke Canal Site of Special Scientific Interest (UK) 101 protected area overlaps with site 0
Ash To Brookwood Heaths Site of Special Scientific Interest (UK) 1,577 protected area overlaps with site 1,573

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Mixed woodland -
Shrubland Heathland -
Grassland -
Wetlands (inland) Standing freshwater, Fens, transition mires and springs -
Artificial/Terrestrial Forestry plantations -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
forestry -
military -
nature conservation and research -
tourism/recreation -
urban/industrial/transport -
For further information about the land use classification please click here.


Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Thames Basin Heaths. Downloaded from http://www.birdlife.org on 09/02/2023.