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Location United Kingdom, East Anglia
Central coordinates 1o 33.37' East  52o 0.27' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 2,520 ha
Altitude 0 - 5m
Year of IBA assessment 2007

Royal Society for the Protection of Birds



Site description This estuary complex includes the Rivers Alde, Butley and Ore, with Havergate Island, and is of considerable geomorphological interest and important for wintering wildfowl and waders. Orfordness and Havergate Island are also important for breeding gulls and terns.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Pied Avocet Recurvirostra avosetta breeding  2002  166 breeding pairs  good  B3, C6  Least Concern 
Pied Avocet Recurvirostra avosetta passage  2001-2006  831 individuals  good  B1i, B2, C2, C6  Least Concern 
Pied Avocet Recurvirostra avosetta winter  2001-2006  1,157 individuals  good  B1i, B2, C2, C6  Least Concern 
Common Redshank Tringa totanus winter  2001-2006  1,697 individuals  good  B1i, C3  Least Concern 
Lesser Black-backed Gull Larus fuscus breeding  2001  5,790 breeding pairs  good  A4i, B1i, B3, C3  Least Concern 
Mediterranean Gull Larus melanocephalus breeding  2000  6 breeding pairs  good  C6  Least Concern 
Common Tern Sterna hirundo breeding  2000  56 breeding pairs  good  C6  Least Concern 
Common Tern Sterna hirundo breeding  2006  51 breeding pairs  good  C6  Least Concern 
Little Tern Sternula albifrons breeding  2000  88 breeding pairs  good  B2, C6  Least Concern 
A4iii Species group - waterbirds winter  2001-2006  36,777 individuals  good  A4iii, C4   

IBA Monitoring

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

Climate change and severe weather habitat shifting and alteration happening now some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance war, civil unrest and military exercises happening now some of area/population (10-49%) slow but significant deterioration medium
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

Recurvirostra avosetta Pied Avocet 760 831 individuals 100 favourable
Recurvirostra avosetta Pied Avocet 735 1157 individuals 100 favourable
Recurvirostra avosetta Pied Avocet 105 166 breeding pairs 100 favourable
Tringa totanus Common Redshank 1830 1697 individuals 93 favourable
Larus fuscus Lesser Black-backed Gull 8200 5790 breeding pairs 71 near favourable
Larus melanocephalus Mediterranean Gull 1 6 breeding pairs 100 favourable
Thalasseus sandvicensis Sandwich Tern 300 3 breeding pairs 1 very unfavourable
Sterna hirundo Common Tern 95 51 breeding pairs 54 unfavourable
Sternula albifrons Little Tern 25 88 breeding pairs 100 favourable
Species group - waterbirds A4iii 23138 36777 individuals 100 favourable
Species group - waterbirds A4iii 12218 6844 breeding pairs 57 unfavourable

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 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Alde-Ore Estuary Birds Directive 2,417 protected area contained by site 2,417  
Alde-Ore Estuary Site of Special Scientific Interest 2,534 protected area overlaps with site 2,378  
Alde-Ore Estuary Wetlands of International Importance (Ramsar) 2,547 protected area overlaps with site 2,376  
Havergate Island and Boyton Marshes RSPB Reserve 377 protected area overlaps with site 222  
Suffolk Coast Heritage Coast 0 protected area overlaps with site 2,385  
Suffolk Coast and Heaths Area of Outstanding Natural Beauty 0 protected area overlaps with site 2,520  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Grassland   -
Wetlands (inland) Coastal lagoons; Mud flats and sand flats; Rivers and streams; Salt marshes; Shingle or stony beaches; Tidal rivers and enclosed tidal waters; Water fringe vegetation  -
Artificial - terrestrial Arable land  -

Land use

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

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Alde - Ore Estuary. Downloaded from http://www.birdlife.org on 25/12/2014

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