Krammer-Volkerak This is an IBA in danger! 

IBA Criteria

Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Barnacle Goose Branta leucopsis LC winter 1988-1991 2,872 individuals A4i, B1i, B2, C2
Common Goldeneye Bucephala clangula LC winter 1988-1991 3,187 individuals B1i, C3
Northern Shoveler Spatula clypeata LC non-breeding 1988-1991 1,251 individuals B1i, C3
Gadwall Mareca strepera LC non-breeding 1988-1991 424 individuals B1i, C3
Eurasian Wigeon Mareca penelope LC winter 1988-1991 12,515 individuals B1i, C3
Northern Pintail Anas acuta LC non-breeding 1988-1991 601 individuals B1i, C3
Pied Avocet Recurvirostra avosetta LC breeding 1987-1991 532 breeding pairs A4i, B1i, B3, C2, C6
Pied Avocet Recurvirostra avosetta LC non-breeding 1988-1991 1,833 individuals A4i, B1i, C2, C6
Charadrius alexandrinus NR breeding 1987-1991 105 breeding pairs B2
Mediterranean Gull Larus melanocephalus LC breeding 1987-1991 15 breeding pairs C6
Little Tern Sternula albifrons LC breeding 1987-1991 36 breeding pairs B2, C6
A4iii Species group - waterbirds n/a unknown 1991 20,000 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 contains site 6,450
Krammer-Volkerak Special Protection Area (Birds Directive) 2,793 protected area contained by 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 27/01/2020.