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Location Netherlands, Zeeland
Central coordinates 3o 56.00' East  51o 35.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 36,880 ha
Altitude
Year of IBA assessment 2000

Vogelbescherming Nederland



Site description This 40-km long water-body was formerly an estuary of the Rhine/Maas river system, via Hollands Diep (025) and Lake Volkerak (026), but has been closed off from the sea since 1986 by a storm-surge barrier which allows the tidal regime to continue with some restrictions. The sea can be completely shut out during storms or high tides. Two freshwater lakes have developed on the eastern side following the construction of secondary dams (Markiezaat and Zoommeer, 029 and 030). South of this area, Lake Veersemeer (031) came into being following the closing of the Veerse Gat in 1961. This site, together with sites 029 and 030, formed part of a single, larger site (former site NL050) 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
Northern Pintail Anas acuta non-breeding  1990  3,440 individuals  good  B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1991  1,645 individuals  good  B2  Least Concern 
Brent Goose Branta bernicla non-breeding  1990  13,175 individuals  good  A4i, B1i, C3  Least Concern 
Tundra Swan Cygnus columbianus winter  1990  443 individuals  good  A4i, B1i, B2, C2  Least Concern 
Common Shelduck Tadorna tadorna non-breeding  1991  3,572 individuals  good  B1i, C3  Least Concern 
Eurasian Wigeon Mareca penelope winter  1991  16,344 individuals  good  B1i, C3  Least Concern 
Northern Shoveler Spatula clypeata non-breeding  1990  858 individuals  good  B1i, C3  Least Concern 
Haematopus ostralegus non-breeding  1990  94,595 individuals  good  A4i, B1i, C3  Not Recognised 
Pied Avocet Recurvirostra avosetta breeding  1991  361 breeding pairs  good  A4i, B1i, B3, C2  Least Concern 
Charadrius alexandrinus breeding  1991  40 breeding pairs  good  B2  Not Recognised 
Grey Plover Pluvialis squatarola non-breeding  1991  7,974 individuals  good  A4i, B1i, C3  Least Concern 
Common Redshank Tringa totanus non-breeding  1991  2,743 individuals  good  B1i, C3  Least Concern 
Bar-tailed Godwit Limosa lapponica winter  1991  5,109 individuals  good  B1i, B2, C2, C6  Least Concern 
Bar-tailed Godwit Limosa lapponica passage  1991  9,170 individuals  good  A4i, B1i, C2  Least Concern 
Eurasian Curlew Numenius arquata non-breeding  1990  13,115 individuals  good  A4i, B1i, C3  Near Threatened 
Eurasian Curlew Numenius arquata winter  1991  6,084 individuals  good  A4i, B1i, B2, C3  Near Threatened 
Spotted Redshank Tringa erythropus non-breeding  1990  1,319 individuals  good  A4i, B1i, C3  Least Concern 
Ruddy Turnstone Arenaria interpres non-breeding  1991  1,334 individuals  good  A4i, B1i, C3  Least Concern 
Red Knot Calidris canutus winter  1991  9,424 individuals  good  A4i, B1i, B2, C3  Least Concern 
Red Knot Calidris canutus passage  1990  14,128 individuals  good  A4i, B1i, C3  Least Concern 
Dunlin Calidris alpina non-breeding  1990  39,459 individuals  good  A4i, B1i, C3  Least Concern 
Dunlin Calidris alpina winter  1991  25,361 individuals  good  A4i, B1i, B2, C3  Least Concern 
A4iii Species group - waterbirds non-breeding  1990-1991  100,000-499,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds winter  1990-1991  50,000-99,999 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Inlagen Anna Friso Nature Reserve 10 protected area contained by site 10  
Inlagen Noord-Beveland Nature Reserve 45 protected area contained by site 45  
Oosterschelde - NL1000018 Habitats Directive 36,888 protected area contains site 36,880  
Oosterschelde - NL3009016 Birds Directive 35,495 protected area contained by site 35,495  
Oosterschelde and Markiezaatmeer Wetlands of International Importance (Ramsar) 38,000 protected area overlaps with site 36,160  
Oosterschelde Buitendijks Nature Reserve 752 protected area contained by site 752  
Oosterschelde-binnendijks Natural Monument 340 protected area contained by site 340  
Oosterschelde-buitendijks Natural Monument 22,000 protected area contained by site 22,000  
Schelphoek Nature Conservation Law 73 protected area contained by site 224  
Thoolse Schorren en Slikken Nature Reserve 149 protected area contained by site 149  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Coastline Mud flats & sand flats; Tidal rivers & enclosed tidal waters  100%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 80%
water management 100%
nature conservation and research 65%
tourism/recreation 80%
urban/industrial/transport 21%

Protection status National Partial International High340 ha of IBA covered by Natural Monument (Oosterschelde-binnendijks, 340 ha). 240 ha of IBA covered by Natural Monument (Oosterschelde-binnendijks, 240 ha). 1,230 ha of IBA covered by Natural Monument (Oosterschelde-buitendijks, 1,230 ha). 22,000 ha of IBA covered by Natural Monument (Oosterschelde-buitendijks, 22,000 ha). 224 ha of IBA covered by Nature Reserve (Schelphoek, 224 ha). 149 ha of IBA covered by Nature Reserve (Thoolse Schorren en Slikken, 149 ha). 10 ha of IBA covered by Nature Reserve (Inlagen Anna Friso, 10 ha). 45 ha of IBA covered by Nature Reserve (Inlagen Noord-Beveland, 45 ha). 752 ha of IBA covered by Nature Reserve (Oosterschelde Buitendijks, 752 ha). 36,160 ha of IBA covered by Special Protection Area (Oosterschelde, 38,000 ha). 36,160 ha of IBA covered by Ramsar Site (Oosterschelde en Markiezaat, 38,000 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Oosterschelde. Downloaded from http://www.birdlife.org on 17/09/2014

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