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The site was identified as important in 2016 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
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

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2016).

Pressure (threats to the trigger species and/or their habitats)
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

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 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 conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Nieuwkoopse Plassen & De Haeck	Natuurbeschermingswet	2,008	is identical to site	0
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	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

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Wetlands (inland)	Standing freshwater, Water fringe vegetation	-
Artificial/Terrestrial	Highly improved re-seeded landscapes	-

For more information about the IUCN Habitat classification, please click here.

Land-use	Extent (% of site)
fisheries/aquaculture	-
water management	-
hunting	-
nature conservation and research	-
tourism/recreation	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Nieuwkoopse Plassen & De Haeck. Downloaded from http://datazone.birdlife.org/site/factsheet/nieuwkoopse-plassen-&-de-haeck-iba-netherlands on 26/09/2023.