UK002
Alde - Ore Estuary


IBA Justification

The site was identified as important in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Pied Avocet Recurvirostra avosetta LC breeding 2002 166 breeding pairs B3, C6
Pied Avocet Recurvirostra avosetta LC passage 2001-2006 831 individuals B1i, B2, C2, C6
Pied Avocet Recurvirostra avosetta LC winter 2001-2006 1,157 individuals B1i, B2, C2, C6
Common Redshank Tringa totanus LC winter 2001-2006 1,697 individuals B1i, C3
Mediterranean Gull Larus melanocephalus LC breeding 2000 6 breeding pairs C6
Lesser Black-backed Gull Larus fuscus LC breeding 2001 5,790 breeding pairs A4i, B1i, B3, C3
Little Tern Sternula albifrons LC breeding 2000 88 breeding pairs B2, C6
Common Tern Sterna hirundo LC breeding 2000 56 breeding pairs C6
Common Tern Sterna hirundo LC breeding 2006 51 breeding pairs C6
A4iii Species group - waterbirds n/a winter 2001-2006 36,777 individuals A4iii, C4

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2007).


IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2007 very unfavourable medium medium
Was the whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Recurvirostra avosetta Pied Avocet 105 166 breeding pairs 100 favourable
Recurvirostra avosetta Pied Avocet 760 831 individuals 100 favourable
Recurvirostra avosetta Pied Avocet 735 1157 individuals 100 favourable
Tringa totanus Common Redshank 1830 1697 individuals 93 favourable
Larus melanocephalus Mediterranean Gull 1 6 breeding pairs 100 favourable
Larus fuscus Lesser Black-backed Gull 8200 5790 breeding pairs 71 near favourable
Sternula albifrons Little Tern 25 88 breeding pairs 100 favourable
Sterna hirundo Common Tern 95 51 breeding pairs 54 unfavourable
Thalasseus sandvicensis Sandwich Tern 300 3 breeding pairs 1 very unfavourable
Species group - waterbirds A4iii 23138 36777 individuals 100 favourable
Species group - waterbirds A4iii 12218 6844 breeding pairs 57 unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
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

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other 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 Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
The Haven, Aldeburgh Local Nature Reserve 20 protected area overlaps with site 0
Suffolk Coast and Heaths Area of Outstanding Natural Beauty 40,510 protected area overlaps with site 2,520
Suffolk Coast Heritage Coast 0 protected area overlaps with site 2,385
Suffolk Heritage Coast 20,697 protected area overlaps with site 0
Snape Warren Site of Special Scientific Interest (UK) 48 protected area overlaps with site 0
Snape Nature Reserve 235 protected area overlaps with site 0
Sandlings Special Protection Area (Birds Directive) 3,406 protected area is adjacent to site 0
Round Hill Pit, Aldeburgh Site of Special Scientific Interest (UK) 1 protected area contained by site 0
Outer Thames Estuary Special Protection Area (Birds Directive) 392,452 protected area is adjacent to site 0
Outer Thames Estuary Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Orfordness-havergate National Nature Reserve 903 protected area overlaps with site 0
Orfordness - Shingle Street Site of Community Importance (Habitats Directive) 888 protected area overlaps with site 0
Orford Ness Nature Reserve 773 protected area overlaps with site 0
North Warren Nature Reserve 412 protected area overlaps with site 0
Leiston - Aldeburgh Site of Special Scientific Interest (UK) 534 protected area overlaps with site 0
Havergate Island and Boyton Marshes RSPB Reserve 377 protected area overlaps with site 222
Havergate Island & Boyton Marshes Nature Reserve 363 protected area overlaps with site 0
Alde; Ore And Butley Estuaries Site of Community Importance (Habitats Directive) 1,633 protected area contained by site 0
Alde–-Ore Estuary Marine Protected Area (OSPAR) 0 protected area overlaps with site 0
Alde-Ore Estuary Special Protection Area (Birds Directive) 2,404 protected area contained by site 2,417
Alde-Ore Estuary Ramsar Site, Wetland of International Importance 2,547 protected area overlaps with site 2,376
Alde-Ore Estuary Site of Special Scientific Interest (UK) 2,532 protected area overlaps with site 2,378
Alde Ore and Butley Estuaries Marine Protected Area (OSPAR) 0 protected area overlaps with site 0

Habitats

Habitat (IUCN level 1) Habitat detail Extent (% of site)
Marine Intertidal -
Grassland -
Artificial/Terrestrial Arable land -
Marine Neritic -
Marine Coastal/Supratidal -
For more information about the IUCN Habitat classification, please click here.

Land use

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


Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Alde - Ore Estuary. Downloaded from https://datazone.birdlife.org/site/factsheet/alde--ore-estuary-iba-united-kingdom on 01/03/2024.