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Location Netherlands, Flevoland,Friesland,Noord-Holland
Central coordinates 5o 27.00' East  52o 45.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4, C6
Area 109,000 ha
Altitude
Year of IBA assessment 2000

Vogelbescherming Nederland



Site description Previously the Zuiderzee, this area is now a vast shallow freshwater lake, having been cut off from the Wadden Sea (001) by the Afsluitdijk (in 1932) and with 45% of its extent having been reclaimed. The original IJsselmeer was then bisected by a dyke in 1975, which separated it from the southern part now called Markermeer (038). This site adjoins three subsites 035, 036 and 037 (the figure for the area of this site excludes these subsites) which are located along the Frisian coast. The lake receives Rhine water through the IJssel river (046 and 047) via Lake Ketelmeer (039). The wetland habitat in the subsites is not included in the percentage cover for this site (to avoid overlap). Extraction of sand and water occurs, and natural-gas extraction is planned. Military training (artillery) occurs at Breezanddijk (Afsluitdijk). The lake has been locally deepened to over 25 m by sand extraction. This site, together with site 038, formed part of a single, larger site (former site NL030) in the previous pan-European IBA inventory (Grimmett and Jones 1989).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Gadwall Anas strepera non-breeding  1991  480 individuals  good  B1i, C3  Least Concern 
Eurasian Wigeon Anas penelope winter  1991  14,040 individuals  good  B1i, C3  Least Concern 
Common Pochard Aythya ferina non-breeding  1991  6,038 individuals  good  B1i, C3  Least Concern 
Tufted Duck Aythya fuligula non-breeding  1990  28,842 individuals  good  A4i, B1i, C3  Least Concern 
Greater Scaup Aythya marila winter  1991  134,121 individuals  good  A4i, B1i, B2, C3  Least Concern 
Smew Mergellus albellus winter  1990  361 individuals  good  B1i, C2, C6  Least Concern 
Common Merganser Mergus merganser winter  1991  5,524 individuals  good  A4i, B1i, C3  Least Concern 
Great Crested Grebe Podiceps cristatus non-breeding  1990  8,669 individuals  good  B1i, C3  Least Concern 
Great Cormorant Phalacrocorax carbo non-breeding  1990  10,438 individuals  good  A4i, B1i, C3  Least Concern 
Common Coot Fulica atra non-breeding  1991  15,378 individuals  good  B1i, C3  Least Concern 
Black Tern Chlidonias niger passage  1991  90,367 individuals  medium  A4i, B1i, C2, C6  Least Concern 
A4iii Species group - waterbirds non-breeding  1990-1991  50,000-99,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds passage  1991  50,000-99,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds winter  1990-1991  100,000-499,999 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
De Ven Nature Conservation Law 17 protected area contained by site 45  
De Ven Nature Reserve 17 protected area contained by site 17  
Friese IJsselmeerkust - NL1000002 Habitats Directive 2,526 protected area contained by site 2,526  
Friese IJsselmeerkust I Natural Monument 4,800 protected area overlaps with site 88  
Friese IJsselmeerkust II Natural Monument 120 protected area overlaps with site 12  
IJsselmeer Wetlands of International Importance (Ramsar) 108,000 protected area overlaps with site 108,000  
IJsselmeer - NL9803028 Birds Directive 113,290 is identical to site 109,000  
Onderdijken Nature Reserve 100 protected area contained by site 100  
Stoenckherne Natural Monument 40 protected area contained by site 40  
Stoenckherne II Natural Monument 100 protected area contained by site 100  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  95%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 100%
water management 100%
military 12%
tourism/recreation 100%
urban/industrial/transport 15%

Protection status National Low International Low88 ha of IBA covered by Natural Monument (Friese IJsselmeerkust I, 4,800 ha). 12 ha of IBA covered by Natural Monument (Friese IJsselmeerkust II, 120 ha). 45 ha of IBA covered by Natural Monument (De Ven, 45 ha). 40 ha of IBA covered by Natural Monument (Stoenckherne, 40 ha). 100 ha of IBA covered by Natural Monument (Stoenckherne II, 100 ha). 17 ha of IBA covered by Nature Reserve (De Ven, 17 ha). 100 ha of IBA covered by Nature Reserve (Onderdijken, 100 ha). 240 ha of IBA covered by Special Protection Area (Friese IJsselmeerkust, 5,130 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lake IJsselmeer. Downloaded from http://www.birdlife.org on 23/07/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife