|Central coordinates||5o 15.00' East 52o 32.00' North|
|IBA criteria||A4i, A4iii, B1i, B2, C2, C3, C4, C6|
|Year of IBA assessment||2000|
Ornithological information Numbers are based on aerial counts which tend to underestimate species with a scattered occurrence (e.g. Chlidonias niger). This is the main feeding area of the Phalacrocorax carbo that breed at Lepelaarsplassen (067) and Naardermeer (074), and is an important moulting area for (subadult) Cygnus olor, Aythya fuligula and Aythya ferina.
Site description A stagnant freshwater lake, separated from Lake IJsselmeer (034) by the closing of the Houtribdijk in 1975, and bordered to the east by the polders Oostelijk and Zuidelijk Flevoland (reclaimed in 1957 and 1968). The lake is connected to Lake Gooimeer (044) in the south-east, and is also adjacent to Oostvaardersplassen (066) and Lepelaarsplassen (067) in the east, via the Zuidelijk Flevoland polder. The lake has been locally deepened to more than 30 m by sand extraction. This site, together with site 034, formed part of a single, larger site (former site NL030) in the previous international IBA inventory (Grimmett and Jones 1989).
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Eurasian Wigeon Anas penelope||winter||1991||29,500 individuals||good||A4i, B1i, C3||Least Concern|
|Common Pochard Aythya ferina||non-breeding||1990||26,192 individuals||good||A4i, B1i, C3||Least Concern|
|Tufted Duck Aythya fuligula||non-breeding||1991||64,390 individuals||good||A4i, B1i, C3||Least Concern|
|Greater Scaup Aythya marila||winter||1991||15,226 individuals||good||A4i, B1i, B2, C3||Least Concern|
|Smew Mergellus albellus||winter||1991||625 individuals||good||B1i, C2, C6||Least Concern|
|Black Tern Chlidonias niger||passage||1990||871 individuals||good||C6||Least Concern|
|A4iii Species group - waterbirds||winter||1991||-||unknown||A4iii, C4|
|A4iii Species group - waterbirds||non-breeding||1990-1991||-||unknown||A4iii, C4|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|De Drost, Hooft, Warenar||Nature Reserve||15||protected area contained by site||15|
|Gouwzee en kustzone Muiden - NL2003017||Habitats Directive||1,110||protected area overlaps with site||864|
|Ijdoorn||Nature Reserve with Management Subsidy||50||protected area contained by site||67|
|IJmeer||Wetlands of International Importance (Ramsar)||7,400||protected area overlaps with site||7,400|
|Kogen||Nature Reserve||110||protected area contained by site||110|
|Kustzone Muiden||Natural Monument||110||protected area contained by site||110|
|Markermeer||Wetlands of International Importance (Ramsar)||61,000||protected area overlaps with site||61,000|
|Markermeer & IJmeer - NL9803029||Birds Directive||68,508||protected area overlaps with site||69,684|
|Uiterdijken||Nature Reserve||19||protected area contained by site||19|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Standing freshwater||100%|
|Land-use||Extent (% of site)|
Management considerations The main problems are over-fishing, water management (the water-level is deliberately kept high during summer), land reclamation for building IJburg (660 ha will be reclaimed near Amsterdam), pollution by nutrients and by trace pollutants such as cadmium, mercury and DDT (`Other' threat, above), entanglement in fishing nets, and disturbance caused by wildfowl hunting and recreation (leisure navigation). A small part of the area lies in the `Eemmeer, Gooimeer en IJmeer' SPA (as part of the IJmeer).
Protection status National Low International Low110 ha of IBA covered by Natural Monument (Kustzone Muiden, 110 ha). 15 ha of IBA covered by Nature Reserve (De Drost, Hooft, Warenar, 15 ha). 67 ha of IBA covered by Nature Reserve (IJdoorn, 67 ha). 110 ha of IBA covered by Nature Reserve (Kogen, 110 ha). 19 ha of IBA covered by Nature Reserve (Uiterdijken, 19 ha). 110 ha of IBA covered by Special Protection Area (Eemmeer, Gooimeer en IJmeer, 1,800 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Lake Markermeer. Downloaded from http://www.birdlife.org on 23/05/2013
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