Nieuwkoopse Plassen & De Haeck

IBA Criteria

Year of most recent IBA criteria assessment: 2016

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Purple Heron Ardea purpurea LC breeding 2011-2015 133-174 breeding pairs B1i, C6
Black-headed Gull Larus ridibundus LC breeding 2011-2015 4,506-4,524 breeding pairs B3
Sedge Warbler Acrocephalus schoenobaenus LC breeding 2011-2015 825-857 breeding pairs B3

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)
2018 high not assessed high
Was the whole site covered? Yes State assessed by unset
Accuracy of information medium

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) moderate to rapid deterioration high
Pollution excess energy - noise pollution happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Residential and commercial development tourism and recreation areas happening now small area/few individuals (<10%) moderate to rapid deterioration low
Transportation and service corridors flight paths happening now whole area/population (>90%) slow but significant deterioration high

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 The conservation measures needed for the site are being comprehensively and effectively implemented high
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Nieuwkoopse Plassen & de Haeck Site of Community Importance (Habitats Directive) 2,008 is identical to site 2,000
Nieuwkoopse Plassen & De Haeck Special Protection Area (Birds Directive) 1,986 is identical to site 2,000
Nieuwkoopse Plassen & De Haeck Natuurbeschermingswet 2,008 is identical to site 0
Nieuwkoopse Plassen Nature Conservation Law 1,139 protected area contained by site 1,127
De Meije Nature Reserve 39 protected area contained by site 39
De Haeck Nature Reserve with Management Subsidy 11 protected area contained by site 10
De Haak Natural Monument 60 protected area contained by site 60


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater, Water fringe vegetation -
Artificial/Terrestrial Highly improved re-seeded landscapes -
For further information about the habitat classification please click here.

Land use

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

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Nieuwkoopse Plassen & De Haeck. Downloaded from on 28/11/2022.