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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') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Mute Swan Cygnus olor	LC	non-breeding	2011-2015	5,083-6,091 individuals	B1i, C3
Tundra Swan Cygnus columbianus	LC	non-breeding	2011-2015	1,144-1,933 individuals	B1i, C2, C6
Barnacle Goose Branta leucopsis	LC	non-breeding	2011-2015	103,691-113,028 individuals	A4i, B1i, C2, C6
Bean Goose Anser fabalis	LC	non-breeding	2011-2015	16,018-26,560 individuals	A4i, B1i, C3
Smew Mergellus albellus	LC	non-breeding	2011-2015	893-2,195 individuals	B1i, C2, C6
Goosander Mergus merganser	LC	non-breeding	2011-2015	7,328-20,187 individuals	B1i, C3
Red-breasted Merganser Mergus serrator	LC	non-breeding	2011-2015	994-2,710 individuals	B1i, C3
Common Pochard Aythya ferina	VU	non-breeding	2011-2015	4,853-10,933 individuals	A1, B1i, C1, C3
Common Pochard Aythya ferina	VU	winter	2011-2015	1,383 individuals	B2
Tufted Duck Aythya fuligula	LC	non-breeding	2011-2015	17,610-22,182 individuals	B1i, C3
Greater Scaup Aythya marila	LC	non-breeding	2011-2015	79,927-126,405 individuals	A4i, B1i, C3
Greater Scaup Aythya marila	LC	winter	2011-2015	64,242 individuals	B2
Gadwall Mareca strepera	LC	non-breeding	2011-2015	2,322-3,869 individuals	B1i, C3
Eurasian Wigeon Mareca penelope	LC	non-breeding	2011-2015	21,117-29,837 individuals	B1i, C3
Northern Pintail Anas acuta	LC	non-breeding	2011-2015	842-1,905 individuals	B1i, C3
Eurasian Coot Fulica atra	LC	non-breeding	2011-2015	27,316-62,918 individuals	B1i, C3
Eurasian Spoonbill Platalea leucorodia	LC	breeding	2011-2015	87-114 breeding pairs	B1i, C2
Eurasian Spoonbill Platalea leucorodia	LC	non-breeding	2011-2015	197-332 individuals	B1i, C2
Great White Egret Ardea alba	LC	breeding	2011-2015	9-35 breeding pairs	C6
Great Cormorant Phalacrocorax carbo	LC	non-breeding	2011-2015	16,294-20,051 individuals	B1i, C3
Great Cormorant Phalacrocorax carbo	LC	breeding	2011-2015	4,614-6,222 breeding pairs	B1i, C3
Eurasian Golden Plover Pluvialis apricaria	LC	non-breeding	2011-2015	6,255-11,050 individuals	C6
Eurasian Curlew Numenius arquata	NT	non-breeding	2011-2015	7,898-9,931 individuals	B1i, C3
Black-tailed Godwit Limosa limosa	NT	non-breeding	2011-2015	2,390-2,947 individuals	B1i, C3
Ruff Calidris pugnax	LC	non-breeding	2011-2015	3,929-6,411 individuals	C6
Black-headed Gull Larus ridibundus	LC	breeding	2011-2015	16,141-18,643 breeding pairs	B1i, B3, C3
Mediterranean Gull Larus melanocephalus	LC	breeding	2011-2015	78 breeding pairs	B3, C6
Caspian Tern Hydroprogne caspia	LC	non-breeding	2011-2015	67-80 individuals	B1i, C2, C6
Black Tern Chlidonias niger	LC	non-breeding	2011-2015	16,736-22,000 individuals	A4i, B1i, C2, C6
Common Tern Sterna hirundo	LC	breeding	2011-2015	4,646-5,404 breeding pairs	B1i, C2, C6
Common Tern Sterna hirundo	LC	non-breeding	2011-2015	6,975-8,990 individuals	C6
A4iii Species group - waterbirds	n/a	non-breeding	2011-2015	155,654-203,754 individuals	A4iii, C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2016) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2016. The most recent assessment (2018) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happening now	majority/most of area/population (50-90%)	very rapid to severe deterioration	very high
Residential and commercial development	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	happening now	small area/few individuals (<10%)	moderate to rapid deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other 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	Some limited conservation initiatives are in place	medium

Year	Protected Area	Designation	% overlap with IBA
-	De Ven	Nature Reserve	<1
-	De Ven	Nature Conservation Law	<1
-	Onderdijken	Nature Reserve	<1
1982	Stoenckherne	Natural Monument	<1
1986	Stoenckherne II	Natural Monument	<1
1991	Friese IJsselmeerkust II	Natural Monument	<1
1991	Friese IJsselmeerkust I	Natural Monument	<1
1996	IJsselmeer	Site of Community Importance (Habitats Directive)	2
2000	IJsselmeer	Special Protection Area (Birds Directive)	100
2000	IJsselmeer	Ramsar Site, Wetland of International Importance	99
2010	IJsselmeer	Natuurbeschermingswet	100

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		95

1. IUCN Habitat classification.

Land use	% of IBA
fisheries/aquaculture	100
water management	100
tourism/recreation	100
urban/industrial/transport	15
military	12

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake IJsselmeer (Netherlands). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-ijsselmeer-iba-netherlands on 22/11/2024.