UK086
Dee Estuary


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
Tundra Swan Cygnus columbianus LC winter 2001-2006 78 individuals B2, C6
Common Shelduck Tadorna tadorna LC passage 2001-2006 11,669 individuals A4i, B1i, C3
Common Shelduck Tadorna tadorna LC winter 2001-2006 5,968 individuals A4i, B1i, C3
Northern Pintail Anas acuta LC passage 2001-2006 4,129 individuals B1i, C3
Northern Pintail Anas acuta LC winter 2001-2006 5,495 individuals B1i, C3
Haematopus ostralegus NR passage 2001-2006 19,328 individuals A4i, B1i, C3
Haematopus ostralegus NR winter 2001-2006 19,316 individuals A4i, B1i, C3
Eurasian Curlew Numenius arquata NT passage 2001-2006 4,829 individuals A4i, B1i, C3
Eurasian Curlew Numenius arquata NT winter 2001-2006 2,819 individuals B2
Black-tailed Godwit Limosa limosa NT passage 2001-2006 4,390 individuals A4i, B1i, C3
Black-tailed Godwit Limosa limosa NT winter 2001-2006 4,559 individuals A4i, B1i, C3
Red Knot Calidris canutus NT winter 2001-2006 8,766 individuals A4i, B1i, B2, C3
Dunlin Calidris alpina LC winter 2001-2006 13,700 individuals B1i, B2, C3
Common Redshank Tringa totanus LC passage 2001-2006 8,815 individuals A4i, B1i, C3
Common Redshank Tringa totanus LC winter 2001-2006 5,020 individuals A4i, B1i, C3
Little Tern Sternula albifrons LC breeding 2000 75 breeding pairs B2, C6
Little Tern Sternula albifrons LC breeding 1999-2004 84 breeding pairs B2, C6
Common Tern Sterna hirundo LC breeding 1999-2004 547 breeding pairs C6
Sandwich Tern Thalasseus sandvicensis LC breeding 1998-2003 516 breeding pairs B1i, B2, C6
A4iii Species group - waterbirds n/a passage 2001-2006 75,331 individuals A4iii, C4
A4iii Species group - waterbirds n/a winter 2001-2006 86,342 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 very 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 livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Agricultural expansion and intensification marine and freshwater aquaculture - industrial aquaculture past (and unlikely to return) and no longer limiting some of area/population (10-49%) slow but significant deterioration low
Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale happening now whole area/population (>90%) slow but significant deterioration high
Climate change and severe weather habitat shifting and alteration likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Energy production and mining renewable energy likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Human intrusions and disturbance recreational activities likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Residential and commercial development commercial and industrial development likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Residential and commercial development housing and urban areas likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Residential and commercial development tourism and recreation areas 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) some of area/population (10-49%) moderate to rapid deterioration medium

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Cygnus columbianus Tundra Swan 54 78 individuals 100 favourable
Tadorna tadorna Common Shelduck 7000 5968 individuals 86 near favourable
Anas acuta Northern Pintail 7200 5495 individuals 77 near favourable
Anas acuta Northern Pintail 7200 5495 individuals 77 near favourable
Anas crecca 5950 2722 individuals 46 unfavourable
Haematopus ostralegus Eurasian Oystercatcher 30200 19316 individuals 64 unfavourable
Haematopus ostralegus Eurasian Oystercatcher 28200 19328 individuals 69 unfavourable
Pluvialis squatarola Grey Plover 1940 593 individuals 31 very unfavourable
Charadrius hiaticula Common Ringed Plover 535 318 individuals 60 unfavourable
Numenius arquata Eurasian Curlew 3860 2819 individuals 74 near favourable
Numenius arquata Eurasian Curlew 4740 4829 individuals 100 favourable
Limosa lapponica Bar-tailed Godwit 935 169 individuals 19 very unfavourable
Limosa limosa Black-tailed Godwit 1610 4559 individuals 100 favourable
Limosa limosa Black-tailed Godwit 1620 4390 individuals 100 favourable
Calidris canutus Red Knot 5900 2463 individuals 42 unfavourable
Calidris canutus Red Knot 19300 8766 individuals 46 unfavourable
Calidris alpina Dunlin 23800 13700 individuals 58 unfavourable
Tringa totanus Common Redshank 7250 5020 individuals 70 near favourable
Tringa totanus Common Redshank 8350 8815 individuals 100 favourable
Sternula albifrons Little Tern 65 84 breeding pairs 100 favourable
Species group - waterbirds A4iii 64507 75331 individuals 100 favourable
Species group - waterbirds A4iii 126157 86342 individuals 69 unfavourable

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 Some limited conservation initiatives are in place medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
The Mersey Narrows and North Wirral Foreshore Ramsar Site, Wetland of International Importance 2,078 protected area is adjacent to site 0
The Dee Estuary Special Protection Area (Birds Directive) 14,295 protected area contains site 13,142
The Dee Estuary Ramsar Site, Wetland of International Importance 14,302 protected area contains site 13,085
The Dee Estuary Marine Protected Area (OSPAR) 0 protected area contained by site 0
Red Rocks Site of Special Scientific Interest (UK) 11 protected area overlaps with site 0
North Wirral Foreshore Site of Special Scientific Interest (UK) 1,963 protected area is adjacent to site 0
Mersey Narrows and North Wirral Foreshore Marine Protected Area (OSPAR) 2,000 protected area is adjacent to site 0
Mersey Narrows and North Wirral Foreshore Special Protection Area (Birds Directive) 2,078 protected area is adjacent to site 0
Liverpool Bay / Bae Lerpwl Marine Protected Area (OSPAR) 0 protected area is adjacent to site 0
Liverpool Bay / Bae Lerpwl Special Protection Area (Birds Directive) 252,758 protected area is adjacent to site 0
Hilbre Islands Local Nature Reserve 54 protected area contained by site 0
Gronant Dunes and Talacre Warren Site of Special Scientific Interest (UK) 519 protected area overlaps with site 0
GRONANT DUNES Local Nature Reserve 188 protected area overlaps with site 0
Dee Estuary/Aber Afon Dyfrdwy Site of Special Scientific Interest (UK) 7,409 protected area overlaps with site 8,443
Dee Estuary/ Aber Dyfrdwy Site of Community Importance (Habitats Directive) 15,805 protected area contains site 0
Dee Estuary / Aber Dyfrdwy Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Dee Estuary Site of Special Scientific Interest (UK) 6,324 protected area contained by site 5,241
Dee Estuary RSPB Reserve 5,493 protected area overlaps with site 5,347
Dee Estuary Nature Reserve 6,093 protected area overlaps with site 0
Dee Cliffs Site of Special Scientific Interest (UK) 15 protected area overlaps with site 0

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Tidal rivers and enclosed tidal waters, Mud flats and sand flats, Salt marshes, Sand dunes and beaches, Shingle or stony beaches, Water fringe vegetation -
For further information about the habitat classification please click here.

Land use

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


Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Dee Estuary. Downloaded from http://www.birdlife.org on 24/05/2022.