Year of most recent IBA criteria assessment: 2007
Populations of IBA trigger speciesSpecies | Current IUCN Red List Category | Season | Year(s) of estimate | Population at site | IBA criteria triggered |
---|---|---|---|---|---|
Gadwall Mareca strepera | LC | winter | 2001-2006 | 357 individuals | B1i, C3 |
Pied Avocet Recurvirostra avosetta | LC | passage | 2001-2006 | 649 individuals | B2 |
Pied Avocet Recurvirostra avosetta | LC | winter | 2001-2006 | 628 individuals | B2, C6 |
Pied Avocet Recurvirostra avosetta | LC | breeding | 1995 | 33 breeding pairs | C6 |
Common Ringed Plover Charadrius hiaticula | LC | passage | 2001-2006 | 737 individuals | B1i, C3 |
Eurasian Curlew Numenius arquata | NT | passage | 2001-2006 | 1,412 individuals | B2 |
Eurasian Curlew Numenius arquata | NT | winter | 2001-2006 | 1,495 individuals | B2 |
Black-tailed Godwit Limosa limosa | NT | passage | 2001-2006 | 3,299 individuals | B1i, C3 |
Black-tailed Godwit Limosa limosa | NT | winter | 2001-2006 | 1,247 individuals | B1i, C3 |
Dunlin Calidris alpina | LC | passage | 2001-2006 | 5,541 individuals | B2 |
Dunlin Calidris alpina | LC | winter | 2001-2006 | 15,181 individuals | B1i, B2, C3 |
Common Redshank Tringa totanus | LC | winter | 2001-2006 | 1,720 individuals | B1i, C3 |
A4iii Species group - waterbirds | n/a | passage | 2001-2006 | 24,702 individuals | A4iii, C4 |
A4iii Species group - waterbirds | n/a | winter | 2001-2006 | 47,805 individuals | A4iii, C4 |
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
IBA conservation status - summary | |||
---|---|---|---|
Year of assessment (most recent) | Threat (pressure) | Condition (state) | Action (response) |
2007 | medium | favourable | low |
Was the whole site assessed? | yes | Condition (state) assessed by | population |
Accuracy of information | good |
Threats to the site (pressure) | |||||
---|---|---|---|---|---|
Threat level 1 | Threat level 2 | Timing | Scope | Severity | Result |
Climate change and severe weather | habitat shifting and alteration | happening now | small area/few individuals (<10%) | slow but significant deterioration | low |
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 - small dams | likely in short term (within 4 years) | some of area/population (10-49%) | slow but significant deterioration | medium |
Natural system modifications | other ecosystem modifications | happening now | small area/few individuals (<10%) | slow but significant deterioration | low |
Pollution | garbage & solid waste | likely in short term (within 4 years) | small area/few individuals (<10%) | moderate to rapid deterioration | low |
Residential and commercial development | commercial and industrial development | likely in short term (within 4 years) | small area/few individuals (<10%) | moderate to rapid deterioration | low |
Transportation and service corridors | roads and railroads | likely in short term (within 4 years) | small area/few individuals (<10%) | moderate to rapid deterioration | low |
Transportation and service corridors | shipping lanes | likely in short term (within 4 years) | small area/few individuals (<10%) | moderate to rapid deterioration | low |
Condition of the site (state), by species | ||||||
---|---|---|---|---|---|---|
Scientific name | Common name | Reference population | Actual population | Units | % of population remaining | Result |
Mareca strepera | Gadwall | 130 | 357 | individuals | 100 | favourable |
Recurvirostra avosetta | Pied Avocet | 205 | 628 | individuals | 100 | favourable |
Charadrius hiaticula | Common Ringed Plover | 585 | 737 | individuals | 100 | favourable |
Numenius arquata | Eurasian Curlew | 1110 | 1495 | individuals | 100 | favourable |
Numenius arquata | Eurasian Curlew | 1160 | 1412 | individuals | 100 | favourable |
Limosa limosa | Black-tailed Godwit | 255 | 1247 | individuals | 100 | favourable |
Limosa limosa | Black-tailed Godwit | 515 | 3299 | individuals | 100 | favourable |
Calidris alpina | Dunlin | 12900 | 15181 | individuals | 100 | favourable |
Calidris alpina | Dunlin | 5650 | 5541 | individuals | 99 | favourable |
Tringa totanus | Common Redshank | 1890 | 1720 | individuals | 92 | favourable |
Tringa totanus | Common Redshank | 1680 | 1285 | individuals | 77 | not assessed |
Species group - waterbirds | A4iii | 36027 | 47805 | individuals | 100 | 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) | A management plan exists but it is out of date or not comprehensive | Some limited conservation initiatives are in place | low |
Protected area (PA) | PA designation | PA area (ha) | Relationship of PA with IBA | Overlap of PA with IBA (ha) |
---|---|---|---|---|
West Thurrock Lagoon & Marshes | Site of Special Scientific Interest (UK) | 67 | protected area overlaps with site | 0 |
Vange & Fobbing Marshes | Site of Special Scientific Interest (UK) | 167 | protected area is adjacent to site | 0 |
Thames Estuary and Marshes | Marine Protected Area (OSPAR) | 0 | protected area overlaps with site | 0 |
Thames Estuary and Marshes | Ramsar Site, Wetland of International Importance | 5,589 | protected area overlaps with site | 5,589 |
Thames Estuary and Marshes | Special Protection Area (Birds Directive) | 4,802 | protected area contained by site | 4,839 |
South Thames Estuary and Marshes | Site of Special Scientific Interest (UK) | 5,289 | protected area overlaps with site | 5,355 |
South Essex Marshes | Nature Reserve | 736 | protected area is adjacent to site | 0 |
Shorne Marshes | Nature Reserve | 391 | protected area overlaps with site | 0 |
Rainham Marshes | Nature Reserve | 409 | protected area contained by site | 0 |
Rainham Marshes | Local Nature Reserve | 79 | protected area overlaps with site | 0 |
Northward Hill | Nature Reserve | 364 | protected area overlaps with site | 0 |
Mucking Flats and Marshes | Site of Special Scientific Interest (UK) | 313 | protected area overlaps with site | 0 |
Medway Estuary and Marshes | Special Protection Area (Birds Directive) | 4,686 | protected area is adjacent to site | 0 |
Medway Estuary and Marshes | Site of Special Scientific Interest (UK) | 4,748 | protected area is adjacent to site | 0 |
Medway Estuary and Marshes | Marine Protected Area (OSPAR) | 0 | protected area is adjacent to site | 0 |
Medway Estuary & Marshes | Ramsar Site, Wetland of International Importance | 4,697 | protected area is adjacent to site | 0 |
Medway Estuary | Marine Conservation Zone | 6,000 | protected area overlaps with site | 0 |
Medway Estuary | Marine Protected Area (OSPAR) | 5,800 | protected area overlaps with site | 0 |
Inner Thames Marshes | Site of Special Scientific Interest (UK) | 486 | protected area overlaps with site | 487 |
Holehaven Creek | Site of Special Scientific Interest (UK) | 273 | protected area overlaps with site | 0 |
Crossness | Local Nature Reserve | 26 | protected area is adjacent to site | 0 |
Cliffe Pools | Nature Reserve | 238 | protected area overlaps with site | 0 |
Canvey Wick | Site of Special Scientific Interest (UK) | 93 | protected area is adjacent to site | 0 |
IUCN Habitat | Habitat detail | Extent (% of site) |
---|---|---|
Marine Intertidal | - | |
Forest | Broadleaved deciduous woodland, Mixed woodland | - |
Shrubland | Scrub | - |
Grassland | Humid grasslands | - |
Wetlands (inland) | Water fringe vegetation | - |
Artificial/Terrestrial | Arable land | - |
Marine Neritic | - | |
Marine Coastal/Supratidal | - |
Land-use | Extent (% of site) |
---|---|
agriculture | - |
nature conservation and research | - |
urban/industrial/transport | - |
Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Thames Estuary and Marshes. Downloaded from
http://datazone.birdlife.org/site/factsheet/2615 on 29/05/2023.