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Location Netherlands, Flevoland,Noord-Holland
Central coordinates 5o 15.00' East  52o 32.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4, C6
Area 69,700 ha
Altitude
Year of IBA assessment 2000

Vogelbescherming Nederland



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).

Key Biodiversity 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.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Eurasian Wigeon Mareca 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  20,000-49,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds non-breeding  1990-1991  50,000-99,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2013 very high not assessed medium
unset
Unknown

Climate change and severe weather habitat shifting and alteration likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Energy production and mining renewable energy likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Natural system modifications dams & water management/use - large dams happening now whole area/population (>90%) moderate to rapid deterioration very high
Over-exploitation, persecution and control of species fishing & harvesting aquatic resources - unintentional effects: large scale happening now whole area/population (>90%) very rapid to severe deterioration very high

Whole area of site (>90%) covered by appropriate conservation designation  No management plan exists but the management planning process has begun  The conservation measures needed for the site are being comprehensively and effectively implemented  medium 

Protected areas

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  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  100%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 90%
water management 100%
hunting 5%
tourism/recreation 100%
urban/industrial/transport 40%

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 (2014) Important Bird Areas factsheet: Lake Markermeer. Downloaded from http://www.birdlife.org on 18/12/2014

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