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Location Netherlands, Noord-Brabant,Zeeland,Zuid-Holland
Central coordinates 4o 15.00' East  51o 39.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 6,450 ha
Altitude
Year of IBA assessment 2000

Vogelbescherming Nederland



Site description A former tidal estuary of the Rhine/Maas river sytem, closed off from the Oosterschelde (028) in 1987. It also adjoins Grevelingen (027) in the west, Haringvliet/Hollands Diep (024/025) in the north, and is linked with the Zoommeer (029) via the Schelde-Rhine river connection (shipping lane to Antwerp). The 20-km long stagnant freshwater lake includes some islets. Hunting is allowed but with restrictions as to quarry species.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta non-breeding  1991  601 individuals  good  B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1991  2,872 individuals  good  A4i, B1i, B2, C2  Least Concern 
Gadwall Anas strepera non-breeding  1991  424 individuals  good  B1i, C3  Least Concern 
Eurasian Wigeon Anas penelope winter  1991  12,515 individuals  good  B1i, C3  Least Concern 
Northern Shoveler Anas clypeata non-breeding  1991  1,251 individuals  good  B1i, C3  Least Concern 
Common Goldeneye Bucephala clangula winter  1991  3,187 individuals  good  B1i, C3  Least Concern 
Pied Avocet Recurvirostra avosetta breeding  1991  532 breeding pairs  good  A4i, B1i, B3, C2, C6  Least Concern 
Pied Avocet Recurvirostra avosetta non-breeding  1991  1,833 individuals  good  A4i, B1i, C2, C6  Least Concern 
Kentish Plover Charadrius alexandrinus breeding  1991  105 breeding pairs  good  B2  Least Concern 
Mediterranean Gull Larus melanocephalus breeding  1991  15 breeding pairs  good  C6  Least Concern 
Little Tern Sterna albifrons breeding  1991  36 breeding pairs  good  B2, C6  Least Concern 
A4iii Species group - waterbirds unknown  1991  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Dintelse Gorzen Nature Reserve 12 protected area contained by site 12  
Dintelse Gorzen II Nature Reserve 493 protected area contained by site 493  
Hellegatsplaten Nature Reserve 420 protected area contained by site 420  
Inlaag 1887 Nature Reserve 18 protected area contained by site 18  
Krammer-Volkerak Wetlands of International Importance (Ramsar) 6,450 protected area contains site 6,450  
Krammer-Volkerak - NL1000021 Birds Directive 6,080 protected area contained by site 6,080  
Krammer-Volkerak I Natural Monument 3,300 protected area contained by site 3,300  
Krammer-Volkerak II Natural Monument 130 protected area contained by site 130  
Krammersche Slikken Nature Conservation Law 36 protected area contained by site 295  
Schorren bij Ooltgensplaat Nature Reserve 15 protected area contained by site 15  
Slikken van de Heen Nature Reserve 4 protected area contained by site 4  
Slikken van de Heen en Plaat van de Vliet Nature Reserve 600 protected area contained by site 600  
Slikken van de Heen II Nature Reserve 193 protected area contained by site 193  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  100%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 60%
water management 100%
hunting 100%
nature conservation and research 54%
tourism/recreation 60%
urban/industrial/transport 10%

Protection status National Partial International High3,300 ha of IBA covered by Natural Monument (Krammer- Volkerak I, 3,300 ha). 130 ha of IBA covered by Natural Monument (Krammer-Volkerak II, 130 ha). 295 ha of IBA covered by Nature Reserve (Krammersche Slikken, 295 ha). 15 ha of IBA covered by Nature Reserve (Schorren bij Ooltgensplaat, 15 ha). 4 ha of IBA covered by Nature Reserve (Slikken van de Heen, 4 ha). 193 ha of IBA covered by Nature Reserve (Slikken van de Heen II, 193 ha). 600 ha of IBA covered by Nature Reserve (Slikken van de Heen en Plaat van de Vliet, 600 ha). 12 ha of IBA covered by Nature Reserve (Dintelse Gorzen, 12 ha). 493 ha of IBA covered by Nature Reserve (Dintelse Gorzen II, 493 ha). 420 ha of IBA covered by Nature Reserve (Hellegatsplaten, 420 ha). 18 ha of IBA covered by Nature Reserve (Inlaag 1887, 18 ha). 6,300 ha of IBA covered by Special Protection Area (Krammer-Volkerak, 6,450 ha). 6,300 ha of IBA covered by Ramsar Site (Krammer-Volkerak, 6,450 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lake Volkerak. Downloaded from http://www.birdlife.org on 17/04/2014

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