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The site was identified as internationally important for bird conservation in 2016 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Mute Swan Cygnus olor	LC	non-breeding (2011–2015)	2,453–3,814 birds	B1i, C3
Barnacle Goose Branta leucopsis	LC	breeding (2011–2015)	1,759–2,906 pairs	B3, C2, C6
Common Pochard Aythya ferina	VU	non-breeding (2011–2015)	1,922–2,603 birds	A1, C1
Tufted Duck Aythya fuligula	LC	non-breeding (2011–2015)	16,783–20,121 birds	B1i, C3
Northern Shoveler Spatula clypeata	LC	non-breeding (2011–2015)	2,407–3,737 birds	B1i, C3
Gadwall Mareca strepera	LC	non-breeding (2011–2015)	5,083–5,951 birds	B1i, C3
Northern Pintail Anas acuta	LC	non-breeding (2011–2015)	666–888 birds	B1i, C3
Horned Grebe Podiceps auritus	VU	non-breeding (2011–2015)	36–78 birds	A1, C1, C6
Horned Grebe Podiceps auritus	VU	winter (2011–2015)	27 birds	B2
Eurasian Coot Fulica atra	LC	non-breeding (2011–2015)	18,679–24,673 birds	B1i, C3
Eurasian Spoonbill Platalea leucorodia	LC	breeding (2011–2015)	70–100 pairs	B1i
Eurasian Spoonbill Platalea leucorodia	LC	non-breeding (2011–2015)	324–529 birds	B1i, C2, C6
Great White Egret Ardea alba	LC	breeding (2011–2015)	4–14 pairs	C6
Little Egret Egretta garzetta	LC	breeding (2011–2015)	9–15 pairs	C6
Pied Avocet Recurvirostra avosetta	LC	non-breeding (2011–2015)	410–579 birds	C6
Mediterranean Gull Larus melanocephalus	LC	breeding (2011–2015)	74–121 pairs	B3, C6
A4iii Species group - waterbirds	n/a	non-breeding (2011–2015)	65,757–75,418 birds	A4iii, C4

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2016. The most recent assessment (2017) is shown below.

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Common Pochard Aythya ferina	1,922 / 130 (birds)	100	good
Tufted Duck Aythya fuligula	16,783 / 4,000 (birds)	100	good
Northern Shoveler Spatula clypeata	2,407 / 310 (birds)	100	good
Gadwall Mareca strepera	5,083 / 480 (birds)	100	good
Northern Pintail Anas acuta	666 / 180 (birds)	100	good
Great Crested Grebe Podiceps cristatus	36 / 2 (birds)	100	good
Eurasian Coot Fulica atra	18,679 / 1,300 (birds)	100	good
Eurasian Spoonbill Platalea leucorodia	70 / 30 (pairs)	100	good
Pied Avocet Recurvirostra avosetta	410 / 430 (birds)	96	good
Mediterranean Gull Larus melanocephalus	74 / 400 (pairs)	19	very poor

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happe­ning now	whole of popul­ation/area (>90%)	moderate decline (10–30% over 3 gener­ations)	very high
Agricultural expansion and intensification	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Energy production and mining	likely in short term (<4 years)	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Human intrusions and disturbance	likely in short term (<4 years)	few indivi­duals/small area (<10%)	slow decline (1–10% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	No management plan exists, but the management planning process has begun	Unknown	low

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Dintelse Gorzen	Nature Reserve (-)	<1
-	Inlaag 1887	Nature Reserve (-)	<1
-	Slikken van de Heen	Nature Reserve (-)	<1
-	Hellegatsplaten	Nature Reserve (-)	7
-	Krammersche Slikken	Nature Conservation Law (-)	5
-	Schorren bij Ooltgensplaat	Nature Reserve (-)	<1
-	Dintelse Gorzen II	Nature Reserve (-)	8
-	Slikken van de Heen II	Nature Reserve (-)	3
-	Slikken van de Heen en Plaat van de Vliet	Nature Reserve (-)	10
1988	Krammer-Volkerak II	Natural Monument (-)	2
1988	Krammer-Volkerak I	Natural Monument (-)	54
1995	Krammer-Volkerak	Natuurbeschermingswet (IV)	100

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	100

Land use	% of IBA
water management	100
hunting	100
fisheries/aquaculture	60
tourism/recreation	60
nature conservation and research	54
urban/industrial/transport	10

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Krammer-Volkerak (Netherlands). Downloaded from https://datazone.birdlife.org/site/factsheet/krammer-volkerak-iba-netherlands on 23/12/2024.