UK093
Severn 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 220 individuals A4i, B1i, B2, C2, C6
Common Shelduck Tadorna tadorna LC winter 2001-2006 3,483 individuals B1i, C3
Northern Pintail Anas acuta LC winter 2001-2006 905 individuals B1i, C3
Common Teal Anas crecca LC winter 2001-2006 4,124 individuals B1i, C3
Common Ringed Plover Charadrius hiaticula LC winter 2001-2006 684 individuals B1i, C3
Eurasian Curlew Numenius arquata NT passage 2001-2006 2,389 individuals B2
Eurasian Curlew Numenius arquata NT winter 2001-2006 2,521 individuals B2
Dunlin Calidris alpina LC passage 2001-2006 6,292 individuals B2
Dunlin Calidris alpina LC winter 2001-2006 22,374 individuals A4i, B1i, B2, C3
Common Redshank Tringa totanus LC winter 2001-2006 1,900 individuals B1i, C3
Common Redshank Tringa totanus LC winter 2001-2006 2,354 individuals B1i, C3
Lesser Black-backed Gull Larus fuscus LC breeding 1999-2002 3,801 breeding pairs A4i, B1i, B3, C3
A4iii Species group - waterbirds n/a passage 2001-2006 36,013 individuals A4iii, C4
A4iii Species group - waterbirds n/a winter 2001-2006 70,201 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)
2015 high not assessed low
Was the whole site covered? Yes State assessed by unset
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
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%) very rapid to severe deterioration high
Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Natural system modifications other ecosystem modifications happening now small area/few individuals (<10%) slow but significant deterioration low
Residential and commercial development tourism and recreation areas likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Transportation and service corridors shipping lanes likely in short term (within 4 years) small area/few individuals (<10%) moderate to rapid deterioration low

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation No management plan exists but the management planning process has begun Some limited conservation initiatives are in place low
For more information about IBA monitoring please click here

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Weston Woods Local Nature Reserve 130 protected area overlaps with site 0
Upper Severn Estuary Site of Special Scientific Interest (UK) 1,462 protected area overlaps with site 1,458
Uphill Cliff Site of Special Scientific Interest (UK) 20 protected area overlaps with site 0
Uphill Local Nature Reserve 38 protected area overlaps with site 0
Sully Island Site of Special Scientific Interest (UK) 11 protected area overlaps with site 0
Steep Holm Site of Special Scientific Interest (UK) 25 protected area overlaps with site 0
Spring Cove Cliffs Site of Special Scientific Interest (UK) 2 protected area contained by site 0
Severn Estuary/ Môr Hafren Site of Community Importance (Habitats Directive) 73,714 protected area overlaps with site 0
Severn Estuary / Môr Hafren Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Severn Estuary (Wales) Site of Special Scientific Interest (UK) 6,854 protected area overlaps with site 0
Severn Estuary Special Protection Area (Birds Directive) 24,488 protected area contained by site 24,663
Severn Estuary Site of Special Scientific Interest (UK) 10,008 protected area overlaps with site 9,927
Severn Estuary Ramsar Site, Wetland of International Importance 24,701 protected area overlaps with site 24,701
Severn Estuary Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
River Wye/ Afon Gwy Site of Community Importance (Habitats Directive) 2,148 protected area is adjacent to site 0
River Wye (Lower Wye)/Afon Gwy (Gwy Isaf) Site of Special Scientific Interest (UK) 247 protected area is adjacent to site 0
River Wye Site of Special Scientific Interest (UK) 906 protected area is adjacent to site 0
River Usk/ Afon Wysg Site of Community Importance (Habitats Directive) 968 protected area is adjacent to site 0
River Usk (Lower Usk)/ Afon Wysg (Wysg Isaf) Site of Special Scientific Interest (UK) 539 protected area is adjacent to site 0
Redcliffe Bay Nature Reserve 6 protected area overlaps with site 0
Purton Passage Site of Special Scientific Interest (UK) 4 protected area contained by site 0
Portishead Pier To Black Nore Site of Special Scientific Interest (UK) 65 protected area overlaps with site 0
Penarth Coast Site of Special Scientific Interest (UK) 88 protected area overlaps with site 0
Newport Wetlands National Nature Reserve 866 protected area overlaps with site 0
Middle Hope Nature Reserve 37 protected area overlaps with site 0
Middle Hope Site of Special Scientific Interest (UK) 84 protected area overlaps with site 0
Mendip Limestone Grasslands Site of Community Importance (Habitats Directive) 415 protected area is adjacent to site 0
Lydney Cliff Site of Special Scientific Interest (UK) 12 protected area overlaps with site 0
Huntspill River National Nature Reserve 149 protected area is adjacent to site 0
Gwlyptiroedd Casnewydd / Newport Wetlands Site of Special Scientific Interest (UK) 374 protected area overlaps with site 0
Gwent Levels - Whitson Site of Special Scientific Interest (UK) 891 protected area is adjacent to site 0
Gwent Levels - St, Brides Site of Special Scientific Interest (UK) 1,306 protected area is adjacent to site 0
Gwent Levels - Rumney and Peterstone Site of Special Scientific Interest (UK) 977 protected area is adjacent to site 0
Gwent Levels - Nash and Goldcliff Site of Special Scientific Interest (UK) 761 protected area is adjacent to site 0
Flat Holm Site of Special Scientific Interest (UK) 35 protected area overlaps with site 0
FLAT HOLM Local Nature Reserve 34 protected area overlaps with site 0
Ellenborough Park West Site of Special Scientific Interest (UK) 2 protected area overlaps with site 0
Eastwood and Battery Point Local Nature Reserve 12 protected area overlaps with site 0
Clevedon Shore Site of Special Scientific Interest (UK) 0 protected area overlaps with site 0
Church and Wains Hill Local Nature Reserve 9 protected area overlaps with site 0
Bridgwater Bay Site of Special Scientific Interest (UK) 6,241 protected area overlaps with site 6,258
Bridgwater Bay National Nature Reserve 2,641 protected area overlaps with site 2,502
Brean Down Site of Special Scientific Interest (UK) 66 protected area overlaps with site 0
Brean Down Nature Reserve 61 protected area overlaps with site 0
Blue Anchor To Lilstock Coast Site of Special Scientific Interest (UK) 675 protected area overlaps with site 0
Berrow Dunes Local Nature Reserve 17 protected area overlaps with site 0
Berrow Dunes Site of Special Scientific Interest (UK) 200 protected area overlaps with site 0
Aust Cliff Site of Special Scientific Interest (UK) 6 protected area contained by site 0

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Forest Mixed woodland -
Shrubland Scrub, Heathland -
Grassland Steppes and dry calcareous grassland, Humid grasslands -
Wetlands (inland) Tidal rivers and enclosed tidal waters, Mud flats and sand flats, Salt marshes, Shingle or stony beaches, Standing brackish and salt water, Rivers and streams, Water fringe vegetation -
Coastline Sea cliffs and rocky shores -
Introduced vegetation -
For further information about the habitat classification please click here.

Land use

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


Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Severn Estuary. Downloaded from http://www.birdlife.org on 12/08/2020.