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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
Barnacle Goose Branta leucopsis	LC	breeding	2009-2014	1,181 breeding pairs	B3, C2, C6
Eurasian Bittern Botaurus stellaris	LC	breeding	2011-2015	11 breeding pairs	C6
Northern Lapwing Vanellus vanellus	NT	winter	2011-2015	4,357 individuals	B2
Black-tailed Godwit Limosa limosa	NT	non-breeding	2011-2015	2,032-2,465 individuals	B1i, C3
Ruff Calidris pugnax	LC	breeding	2011-2015	2 breeding pairs	C6
A4iii Species group - waterbirds	n/a	non-breeding	2011-2015	29,063-36,628 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

Threats to the site (pressure)
Threat Level 1	Threat Level 2	Timing	Scope	Severity	Result
Agricultural expansion and intensification	livestock farming and ranching (includes forest grazing) - agro-industry grazing, ranching or farmin	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Natural system modifications	dams & water management/use - abstraction of ground water (agricultural use)	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Natural system modifications	other ecosystem modifications	happening now	some of area/population (10-49%)	slow but significant deterioration	medium

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

Protected Area	Designation	Area (ha)	Relationship with IBA	Overlap with IBA (ha)
Wormer- en Jisperveld & Kalverpolder	Special Protection Area (Birds Directive)	1,743	is identical to site	1,753
Wormer- en Jisperveld & Kalverpolder	Natuurbeschermingswet	1,839	protected area contains site	1,750
Wormer- en Jisperveld & Kalverpolder	Site of Community Importance (Habitats Directive)	1,453	protected area overlaps with site	1,503
Wormer- En Jisperveld	Nature Reserve	642	protected area contained by site	642

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

For further information about the land use classification please click here.

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Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Wormer- en Jisperveld & Kalverpolder. Downloaded from http://www.birdlife.org on 13/08/2022.