Oostvaardersplassen This is an IBA in danger! 

IBA Criteria

Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Whooper Swan Cygnus cygnus LC winter 1987-1991 475 individuals B1i, B3, C2, C6
Barnacle Goose Branta leucopsis LC winter 1987-1991 2,911 individuals A4i, B1i, B2, C2
Greylag Goose Anser anser LC non-breeding 1987-1990 50,375 individuals A4i, B1i, C3
Greater White-fronted Goose Anser albifrons LC winter 1987-1991 6,723 individuals B1i, C3
Northern Shoveler Spatula clypeata LC non-breeding 1987-1991 3,916 individuals B1i, C3
Gadwall Mareca strepera LC non-breeding 1987-1991 598 individuals B1i, C3
Northern Pintail Anas acuta LC non-breeding 1987-1991 5,013 individuals B1i, C3
Common Teal Anas crecca LC non-breeding 1987-1990 52,580 individuals A4i, B1i, C3
Spotted Crake Porzana porzana LC breeding 1995 28 breeding pairs C6
Eurasian Spoonbill Platalea leucorodia LC breeding 1987-1991 192 breeding pairs A4i, B1i, B2, C2, C6
Eurasian Spoonbill Platalea leucorodia LC non-breeding 1987-1991 582 individuals A4i, B1i, C2, C6
Eurasian Bittern Botaurus stellaris LC resident 1987-1991 7 breeding pairs B2, C6
Great Cormorant Phalacrocorax carbo LC breeding 1987-1991 6,246 breeding pairs A4i, B1i, C3
Great Cormorant Phalacrocorax carbo LC non-breeding 1987-1991 4,247 individuals A4i, B1i, C3
Pied Avocet Recurvirostra avosetta LC non-breeding 1987-1990 4,281 individuals A4i, B1i, C2, C6
Black-tailed Godwit Limosa limosa NT non-breeding 1987-1990 5,596 individuals A4i, B1i, C3
Black Tern Chlidonias niger LC passage 1987-1991 2,336 individuals A4i, B1i, C2, C6
Western Marsh-harrier Circus aeruginosus LC breeding 1987-1991 58 breeding pairs C6
Bluethroat Cyanecula svecica LC breeding 1987-1991 750 breeding pairs C6
A4iii Species group - waterbirds n/a non-breeding 1990 100,000-499,999 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)
2017 very high very unfavourable medium
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
Residential and commercial development housing and urban areas happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Branta leucopsis Barnacle Goose 1800 17102 individuals 100 favourable
Anser anser Greylag Goose 4200 22073 individuals 100 favourable
Anser albifrons Greater White-fronted Goose 600 30465 individuals 100 favourable
Spatula clypeata Northern Shoveler 1900 10131 individuals 100 favourable
Anas crecca Common Teal 1300 5732 individuals 100 favourable
Porzana porzana Spotted Crake 40 14 breeding pairs 35 very unfavourable
Platalea leucorodia Eurasian Spoonbill 160 95 breeding pairs 60 unfavourable
Botaurus stellaris Eurasian Bittern 40 18 breeding pairs 45 unfavourable
Ardea alba Great White Egret 40 160 breeding pairs 100 favourable
Phalacrocorax carbo Great Cormorant 8000 2435 breeding pairs 31 very unfavourable
Circus aeruginosus Western Marsh-harrier 40 62 breeding pairs 100 favourable
Haliaeetus albicilla White-tailed Sea-eagle 1 5 individuals 100 favourable
Locustella luscinioides Savi's Warbler 680 438 breeding pairs 65 unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Very little or no conservation action taking place medium
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)
Oostvaardersplassen Nature Conservation Act 5,477 protected area contained by site 5,600
Oostvaardersplassen Nature Reserve 5,600 protected area contained by site 5,600
Oostvaardersplassen Special Protection Area (Birds Directive) 842 is identical to site 5,505
Oostvaardersplassen Ramsar Site, Wetland of International Importance 5,600 protected area contained by site 5,600


IUCN Habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Alluvial and very wet forest -
Wetlands (inland) Standing freshwater, Water fringe vegetation -
Artificial - terrestrial Ruderal land -
For further information about the habitat classification please click here.

Land use

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

Recommended citation
BirdLife International (2019) Important Bird Areas factsheet: Oostvaardersplassen. Downloaded from on 14/10/2019.