UK066
Stour and Orwell Estuaries


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
Grey Plover Pluvialis squatarola LC passage 2001-2006 2,329 individuals A4i, B1i, C3
Grey Plover Pluvialis squatarola LC winter 2001-2006 3,209 individuals A4i, B1i, C3
Common Ringed Plover Charadrius hiaticula LC passage 2001-2006 856 individuals B1i, C3
Eurasian Curlew Numenius arquata NT passage 2001-2006 1,382 individuals B2
Eurasian Curlew Numenius arquata NT winter 2001-2006 1,791 individuals B2
Black-tailed Godwit Limosa limosa NT passage 2001-2006 2,123 individuals B1i, C3
Black-tailed Godwit Limosa limosa NT winter 2001-2006 1,901 individuals B1i, C3
Ruddy Turnstone Arenaria interpres LC winter 2001-2006 773 individuals A4i, B1i, C3
Red Knot Calidris canutus NT winter 2001-2006 6,361 individuals B1i, B2, C3
Dunlin Calidris alpina LC passage 2001-2006 5,743 individuals B2
Dunlin Calidris alpina LC winter 2001-2006 10,290 individuals B2
Common Redshank Tringa totanus LC passage 2001-2006 2,013 individuals B1i, C3
Common Redshank Tringa totanus LC winter 2001-2006 2,847 individuals B1i, C3
A4iii Species group - waterbirds n/a passage 2001-2006 30,747 individuals A4iii, C4
A4iii Species group - waterbirds n/a winter 2001-2006 58,573 individuals A4iii, C4

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 unfavourable 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 marine and freshwater aquaculture - industrial aquaculture likely in short term (within 4 years) small area/few individuals (<10%) moderate to rapid deterioration low
Climate change and severe weather habitat shifting and alteration happening now majority/most of area/population (50-90%) slow but significant deterioration high
Human intrusions and disturbance recreational activities happening now majority/most of area/population (50-90%) slow but significant deterioration high
Human intrusions and disturbance war, civil unrest and military exercises 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) small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications other ecosystem modifications happening now majority/most of area/population (50-90%) slow but significant deterioration high
Pollution agricultural & forestry effluents - nutrient loads happening now small area/few individuals (<10%) slow but significant deterioration low
Residential and commercial development housing and urban areas 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 key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Tadorna tadorna Common Shelduck 3140 2099 individuals 67 unfavourable
Anas acuta Northern Pintail 700 502 individuals 72 near favourable
Pluvialis squatarola Grey Plover 1610 2329 individuals 100 favourable
Pluvialis squatarola Grey Plover 3460 3209 individuals 93 favourable
Charadrius hiaticula Common Ringed Plover 665 346 individuals 53 unfavourable
Charadrius hiaticula Common Ringed Plover 925 856 individuals 93 favourable
Numenius arquata Eurasian Curlew 2140 1791 individuals 84 near favourable
Numenius arquata Eurasian Curlew 1530 1382 individuals 91 favourable
Limosa limosa Black-tailed Godwit 1710 2123 individuals 100 favourable
Limosa limosa Black-tailed Godwit 2110 1901 individuals 91 favourable
Arenaria interpres Ruddy Turnstone 750 452 individuals 61 unfavourable
Arenaria interpres Ruddy Turnstone 850 773 individuals 91 favourable
Calidris canutus Red Knot 3330 6361 individuals 100 favourable
Calidris alpina Dunlin 24700 10290 individuals 42 unfavourable
Calidris alpina Dunlin 9150 5743 individuals 63 unfavourable
Tringa totanus Common Redshank 3320 2847 individuals 86 near favourable
Tringa totanus Common Redshank 2210 2013 individuals 92 favourable
Species group - waterbirds A4iii 21552 30747 individuals 100 favourable
Species group - waterbirds A4iii 63037 58573 individuals 93 favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation A management plan exists but it is out of date or not comprehensive 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)
Wrabness Local Nature Reserve 27 protected area overlaps with site 0
Suffolk Coast and Heaths Area of Outstanding Natural Beauty 40,510 protected area overlaps with site 2,255
Stour Estuary Nature Reserve 531 protected area overlaps with site 0
Stour Estuary RSPB Reserve 505 protected area overlaps with site 400
Stour Estuary Site of Special Scientific Interest (UK) 2,247 protected area overlaps with site 2,154
Stour and Orwell Estuaries Special Protection Area (Birds Directive) 3,667 protected area overlaps with site 3,317
Stour and Orwell Estuaries Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Stour and Copperas Woods, Ramsey Site of Special Scientific Interest (UK) 78 protected area overlaps with site 0
Stour & Orwell Estuaries Ramsar Site, Wetland of International Importance 3,324 protected area overlaps with site 3,324
Pipers Vale Local Nature Reserve 20 protected area overlaps with site 0
Pin Mill Nature Reserve 34 protected area overlaps with site 0
Orwell Estuary Site of Special Scientific Interest (UK) 1,335 protected area overlaps with site 1,309
Bridge Wood Local Nature Reserve 31 protected area overlaps with site 0

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland -
Grassland Humid grasslands -
Marine Intertidal -
Marine Neritic -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Land use

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


Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Stour and Orwell Estuaries. Downloaded from http://www.birdlife.org on 05/12/2022.