Krammer-Volkerak This is an IBA in danger! 

IBA Criteria

Year of most recent IBA criteria assessment: 2016

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Mute Swan Cygnus olor LC non-breeding 2011-2016 2,453-3,814 individuals B1i, C3
Barnacle Goose Branta leucopsis LC breeding 2011-2016 1,759-2,906 breeding pairs B3, C2, C6
Common Pochard Aythya ferina VU non-breeding 2011-2016 1,922-2,603 individuals A1, C1
Tufted Duck Aythya fuligula LC non-breeding 2011-2016 16,783-20,121 individuals B1i, C3
Northern Shoveler Spatula clypeata LC non-breeding 2011-2016 2,407-3,737 individuals B1i, C3
Gadwall Mareca strepera LC non-breeding 2011-2016 5,083-5,951 individuals B1i, C3
Northern Pintail Anas acuta LC non-breeding 2011-2016 666-888 individuals B1i
Horned Grebe Podiceps auritus VU non-breeding 2011-2016 36-78 individuals A1, C1, C6
Horned Grebe Podiceps auritus VU winter 2011-2016 27 individuals B2
Common Coot Fulica atra LC non-breeding 2011-2016 18,679-24,673 individuals B1i, C3
Common Crane Grus grus LC breeding 2011-2016 max 1 breeding pairs C6
Eurasian Spoonbill Platalea leucorodia LC breeding 2011-2016 70-100 breeding pairs B1i
Eurasian Spoonbill Platalea leucorodia LC non-breeding 2011-2016 324-529 individuals B1i, C2, C6
Great White Egret Ardea alba LC breeding 2011-2016 4-14 breeding pairs C6
Little Egret Egretta garzetta LC breeding 2011-2016 9-15 breeding pairs C6
Pied Avocet Recurvirostra avosetta LC non-breeding 2011-2016 410-579 individuals C6
Mediterranean Gull Larus melanocephalus LC breeding 2011-2016 74-121 breeding pairs B3, C6
Little Tern Sternula albifrons LC non-breeding 2011-2016 12-17 individuals C6
Common Tern Sterna hirundo LC non-breeding 2011-2016 511-672 individuals C6
A4iii Species group - waterbirds n/a non-breeding 2011-2016 65,757-75,418 individuals A4iii, C4

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2017 very high very unfavourable low
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - agro-industry grazing, ranching or farmin happening now some of area/population (10-49%) 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 work and other activities likely in short term (within 4 years) small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications dams & water management/use - abstraction of surface water (unknown use) happening now whole area/population (>90%) moderate to rapid deterioration very high

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Aythya ferina Common Pochard 130 1922 individuals 100 favourable
Aythya fuligula Tufted Duck 4000 16783 individuals 100 favourable
Spatula clypeata Northern Shoveler 310 2407 individuals 100 favourable
Mareca strepera Gadwall 480 5083 individuals 100 favourable
Anas acuta Northern Pintail 180 666 individuals 100 favourable
Podiceps cristatus Great Crested Grebe 2 36 individuals 100 favourable
Fulica atra Common Coot 1300 18679 individuals 100 favourable
Platalea leucorodia Eurasian Spoonbill 30 70 breeding pairs 100 favourable
Recurvirostra avosetta Pied Avocet 430 410 individuals 96 favourable
Larus melanocephalus Mediterranean Gull 400 74 breeding pairs 19 very unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation No management plan exists but the management planning process has begun Unknown low
For more information about IBA monitoring please click here

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Slikken van de Heen II Nature Reserve 193 protected area contained by site 193
Slikken van de Heen en Plaat van de Vliet Nature Reserve 600 protected area contained by site 600
Slikken van de Heen Nature Reserve 4 protected area contained by site 4
Schorren bij Ooltgensplaat Nature Reserve 15 protected area contained by site 15
Krammersche Slikken Nature Conservation Law 36 protected area contained by site 295
Krammer-Volkerak II Natural Monument 130 protected area contained by site 130
Krammer-Volkerak I Natural Monument 3,300 protected area contained by site 3,300
Krammer-Volkerak Ramsar Site, Wetland of International Importance 6,450 protected area overlaps with site 6,450
Krammer-Volkerak Natuurbeschermingswet 6,083 is identical to site 0
Krammer-Volkerak Site of Community Importance (Habitats Directive) 6,081 is identical to site 0
Krammer-Volkerak Special Protection Area (Birds Directive) 6,081 is identical to site 6,080
Inlaag 1887 Nature Reserve 18 protected area contained by site 18
Hellegatsplaten Nature Reserve 420 protected area contained by site 420
Dintelse Gorzen II Nature Reserve 493 protected area contained by site 493
Dintelse Gorzen Nature Reserve 12 protected area contained by site 12


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater, Water fringe vegetation -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
fisheries/aquaculture -
water management -
hunting -
nature conservation and research -
tourism/recreation -
urban/industrial/transport -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Krammer-Volkerak. Downloaded from on 09/07/2020.