UK041
Mersey 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
Common Shelduck Tadorna tadorna LC passage 2001-2006 14,480 individuals A4i, B1i, C3
Common Shelduck Tadorna tadorna LC winter 2001-2006 3,064 individuals B1i, C3
Common Teal Anas crecca LC passage 2001-2006 5,187 individuals B1i, C3
Common Ringed Plover Charadrius hiaticula LC passage 2001-2006 690 individuals B1i, C3
Eurasian Curlew Numenius arquata NT passage 2001-2006 2,180 individuals B2
Eurasian Curlew Numenius arquata NT winter 2001-2006 1,535 individuals B2
Black-tailed Godwit Limosa limosa NT passage 2001-2006 2,129 individuals B1i, C3
Dunlin Calidris alpina LC passage 2001-2006 9,465 individuals B2
Dunlin Calidris alpina LC winter 2001-2006 42,876 individuals A4i, B1i, B2, C3
Common Redshank Tringa totanus LC winter 2001-2006 5,544 individuals A4i, B1i, C3
Common Redshank Tringa totanus LC winter 2001-2006 4,359 individuals A4i, B1i, C3
A4iii Species group - waterbirds n/a passage 2001-2006 45,896 individuals A4iii, C4
A4iii Species group - waterbirds n/a winter 2001-2006 76,704 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 low very unfavourable low
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
No known threats no known threats happening now small area/few individuals (<10%) no or imperceptible deterioration low

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Tadorna tadorna Common Shelduck 5300 3064 individuals 58 unfavourable
Anas acuta Northern Pintail 3210 162 individuals 6 very unfavourable
Anas crecca Common Teal 8830 8830 individuals 100 favourable
Pluvialis apricaria Eurasian Golden Plover 2650 1560 individuals 59 unfavourable
Charadrius hiaticula Common Ringed Plover 205 690 individuals 100 favourable
Numenius arquata Eurasian Curlew 1230 1535 individuals 100 favourable
Numenius arquata Eurasian Curlew 1340 2180 individuals 100 favourable
Calidris alpina Dunlin 46600 42876 individuals 93 favourable
Calidris alpina Dunlin 7800 9465 individuals 100 favourable
Tringa totanus Common Redshank 4610 4359 individuals 95 favourable
Tringa totanus Common Redshank 4350 5544 individuals 100 favourable
Species group - waterbirds A4iii 35198 458976 individuals 100 favourable
Species group - waterbirds A4iii 102890 76704 individuals 75 near favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation Unknown Not assessed 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)
Speke Hall Nature Reserve 54 protected area is adjacent to site 0
Pickerings Pasture Local Nature Reserve 16 protected area is adjacent to site 0
New Ferry Site of Special Scientific Interest (UK) 73 protected area overlaps with site 0
Mersey Estuary Ramsar Site, Wetland of International Importance 5,033 protected area overlaps with site 5,007
Mersey Estuary Special Protection Area (Birds Directive) 5,023 is identical to site 4,498
Mersey Estuary Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Mersey Estuary Site of Special Scientific Interest (UK) 6,719 protected area overlaps with site 5,007
Mersey Estuary Nature Reserve 1,500 protected area overlaps with site 0
Liverpool Bay / Bae Lerpwl Special Protection Area (Birds Directive) 252,758 protected area is adjacent to 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, Standing freshwater, Rivers and streams, Water fringe vegetation -
Coastline Sea cliffs and rocky shores -
For further information about the habitat classification please click here.

Land use

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


Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Mersey Estuary. Downloaded from http://www.birdlife.org on 03/12/2020.