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

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	most of popul­ation/area (50–90%)	rapid decline (>30% over 3 gener­ations)	very high
Residential and commercial development	likely in long term (>4 years)	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Human intrusions and disturbance	happe­ning now	few indivi­duals/small area (<10%)	moderate decline (10–30% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>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 (management category)	% coverage of IBA
-	De Ven	Nature Reserve (-)	<1
-	Onderdijken	Nature Reserve (-)	<1
-	De Ven	Nature Conservation Law (-)	<1
1982	Stoenckherne	Natural Monument (-)	<1
1986	Stoenckherne II	Natural Monument (-)	<1
1991	Friese IJsselmeerkust I	Natural Monument (-)	<1
1991	Friese IJsselmeerkust II	Natural Monument (-)	<1
2010	IJsselmeer	Natuurbeschermingswet (IV)	100

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	95

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 23/12/2024.