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Location United Kingdom, Yorkshire and Humberside
Central coordinates 0o 56.72' West  53o 51.80' North
IBA criteria A4iii, B1i, B2, C3, C4, C6
Area 1,088 ha
Altitude 6 - 8m
Year of IBA assessment 2007

Royal Society for the Protection of Birds



Site description A mosaic of neutral alluvial flood-meadows, fens, swamps, Alnus carr and freshwater habitats lying adjacent to the River Derwent, Pocklington Canal and Thornton Beck. The unimproved flood-meadows are amongst the most important in Europe. This site supports a variety of breeding wetland birds and attracts large numbers of wildfowl in winter.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Whooper Swan Cygnus cygnus winter  2001-2006  76 individuals  good  C6  Least Concern 
Gadwall Mareca strepera breeding  1990-1995  33 breeding pairs  good  B2  Least Concern 
Common Teal Anas crecca winter  2001-2006  4,046 individuals  good  B1i, C3  Least Concern 
Spotted Crake Porzana porzana breeding  1995  6 breeding pairs  good  C6  Least Concern 
Eurasian Golden Plover Pluvialis apricaria winter  2001-2006  3,454 individuals  good  C6  Least Concern 
Ruff Calidris pugnax winter  2001-2006  100 individuals  good  C6  Least Concern 
Ruff Calidris pugnax breeding  1995  6 breeding pairs  good  C6  Least Concern 
A4iii Species group - waterbirds winter  2001-2006  55,836 individuals  good  A4iii, C4   

IBA Monitoring

2007 medium very unfavourable low
Population
Good - based on reliable and complete / representative data

Energy production and mining renewable energy likely in short term (within 4 years) small area/few individuals (<10%) moderate to rapid deterioration low
Invasive and other problematic species and genes problematic native species/diseases - unspecified species happening now small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications dams & water management/use - abstraction of ground water (agricultural use) happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution agricultural & forestry effluents - nutrient loads happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution domestic & urban waste water - sewage happening now small area/few individuals (<10%) slow but significant deterioration low

Cygnus cygnus Whooper Swan 52 76 individuals 100 favourable
Cygnus columbianus Tundra Swan 45 3 individuals 7 very unfavourable
Anas crecca Common Teal 5800 4046 individuals 70 near favourable
Pluvialis apricaria Eurasian Golden Plover 5050 3454 individuals 69 unfavourable
Calidris pugnax Ruff 115 100 individuals 87 near favourable
Species group - waterbirds A4iii 38087 55836 individuals 100 favourable

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Not assessed  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Derwent Ings Site of Special Scientific Interest 668 protected area contained by site 662  
Lower Derwent Valley Birds Directive 1,086 is identical to site 1,086  
Lower Derwent Valley National Nature Reserve 463 protected area contained by site 423  
Lower Derwent Valley Wetlands of International Importance (Ramsar) 915 protected area contained by site 915  
Melbourne and Thornton Ings Site of Special Scientific Interest 200 protected area contained by site 200  
River Derwent Site of Special Scientific Interest 410 protected area overlaps with site 169  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland  -
Grassland   -
Wetlands (inland) Blanket bogs; Fens, transition mires and springs; Rivers and streams; Standing freshwater; Water fringe vegetation  -

Land use

Land-use Extent (% of site)
agriculture -
nature conservation and research -
water management -

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lower Derwent Valley. Downloaded from http://www.birdlife.org on 21/12/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife