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The site was identified as important 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 List1	Season	Year(s)	Size	IBA criteria
Mute Swan Cygnus olor	LC	non-breeding	2011-2015	2,453-3,814 individuals	B1i, C3
Barnacle Goose Branta leucopsis	LC	breeding	2011-2015	1,759-2,906 breeding pairs	B3, C2, C6
Common Pochard Aythya ferina	VU	non-breeding	2011-2015	1,922-2,603 individuals	A1, C1
Tufted Duck Aythya fuligula	LC	non-breeding	2011-2015	16,783-20,121 individuals	B1i, C3
Northern Shoveler Spatula clypeata	LC	non-breeding	2011-2015	2,407-3,737 individuals	B1i, C3
Gadwall Mareca strepera	LC	non-breeding	2011-2015	5,083-5,951 individuals	B1i, C3
Northern Pintail Anas acuta	LC	non-breeding	2011-2015	666-888 individuals	B1i, C3
Horned Grebe Podiceps auritus	VU	non-breeding	2011-2015	36-78 individuals	A1, C1, C6
Horned Grebe Podiceps auritus	VU	winter	2011-2015	27 individuals	B2
Eurasian Coot Fulica atra	LC	non-breeding	2011-2015	18,679-24,673 individuals	B1i, C3
Eurasian Spoonbill Platalea leucorodia	LC	breeding	2011-2015	70-100 breeding pairs	B1i
Eurasian Spoonbill Platalea leucorodia	LC	non-breeding	2011-2015	324-529 individuals	B1i, C2, C6
Great White Egret Ardea alba	LC	breeding	2011-2015	4-14 breeding pairs	C6
Little Egret Egretta garzetta	LC	breeding	2011-2015	9-15 breeding pairs	C6
Pied Avocet Recurvirostra avosetta	LC	non-breeding	2011-2015	410-579 individuals	C6
Mediterranean Gull Larus melanocephalus	LC	breeding	2011-2015	74-121 breeding pairs	B3, C6
A4iii Species group - waterbirds	n/a	non-breeding	2011-2015	65,757-75,418 individuals	A4iii, C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2016) may differ.

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	Reference	Actual	Units	% remaining	Result
Common Pochard Aythya ferina	130	1,922	individuals	100	favourable
Tufted Duck Aythya fuligula	4,000	16,783	individuals	100	favourable
Northern Shoveler Spatula clypeata	310	2,407	individuals	100	favourable
Gadwall Mareca strepera	480	5,083	individuals	100	favourable
Northern Pintail Anas acuta	180	666	individuals	100	favourable
Great Crested Grebe Podiceps cristatus	2	36	individuals	100	favourable
Eurasian Coot Fulica atra	1,300	18,679	individuals	100	favourable
Eurasian Spoonbill Platalea leucorodia	30	70	breeding pairs	100	favourable
Pied Avocet Recurvirostra avosetta	430	410	individuals	96	favourable
Mediterranean Gull Larus melanocephalus	400	74	breeding pairs	19	very unfavourable

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

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other 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

Year	Protected Area	Designation	% overlap with IBA
-	Slikken van de Heen II	Nature Reserve	3
-	Slikken van de Heen	Nature Reserve	<1
-	Dintelse Gorzen II	Nature Reserve	8
-	Inlaag 1887	Nature Reserve	<1
-	Schorren bij Ooltgensplaat	Nature Reserve	<1
-	Dintelse Gorzen	Nature Reserve	<1
-	Krammersche Slikken	Nature Conservation Law	5
-	Slikken van de Heen en Plaat van de Vliet	Nature Reserve	10
-	Hellegatsplaten	Nature Reserve	7
1988	Krammer-Volkerak I	Natural Monument	54
1988	Krammer-Volkerak II	Natural Monument	2
1995	Krammer-Volkerak	Natuurbeschermingswet	100
1995	Krammer-Volkerak	Ramsar Site, Wetland of International Importance	100
1996	Krammer-Volkerak	Site of Community Importance (Habitats Directive)	100
2003	Krammer-Volkerak	Special Protection Area (Birds Directive)	100

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		100

1. IUCN Habitat classification.

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 22/11/2024.