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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
Tundra Swan Cygnus columbianus	LC	non-breeding	2011-2015	624-1,507 individuals	B1i, C2, C6
Barnacle Goose Branta leucopsis	LC	non-breeding	2011-2016	13,624-23,215 individuals	A4i, B1i, C2
Greater White-fronted Goose Anser albifrons	LC	non-breeding	2011-2015	31,500-38,446 individuals	B1i, C3
Smew Mergellus albellus	LC	non-breeding	2011-2016	446-763 individuals	B1i, C2, C6
Tufted Duck Aythya fuligula	LC	non-breeding	2011-2016	12,324-18,218 individuals	B1i, C3
Gadwall Mareca strepera	LC	non-breeding	2011-2016	15,655 individuals	B1i, C3
Eurasian Wigeon Mareca penelope	LC	non-breeding	2011-2016	26,045-45,519 individuals	B1i, C3
Anas crecca	NR	non-breeding	2011-2016	7,928-12,054 individuals	B1i, C3
Common Coot Fulica atra	LC	winter	2011-2016	11,167-14,709 individuals	B2
Black-crowned Night-heron Nycticorax nycticorax	LC	breeding	2011-2016	1 breeding pairs	C6
Great White Egret Ardea alba	LC	non-breeding	2011-2016	453-961 individuals	C6
Pied Avocet Recurvirostra avosetta	LC	breeding	2011-2016	192-408 breeding pairs	C6
Black-tailed Godwit Limosa limosa	NT	non-breeding	2011-2015	2,517-4,196 individuals	B1i, C3
Black-headed Gull Larus ridibundus	LC	non-breeding	2011-2016	81,530 individuals	A4i, B1i, C3
Osprey Pandion haliaetus	LC	non-breeding	2011-2016	9-13 individuals	C6
White-tailed Sea-eagle Haliaeetus albicilla	LC	breeding	2011-2016	1-2 breeding pairs	C6
White-tailed Sea-eagle Haliaeetus albicilla	LC	non-breeding	2011-2016	4-6 individuals	C6
Common Kingfisher Alcedo atthis	LC	breeding	2011-2016	22-33 breeding pairs	B2, C6
Peregrine Falcon Falco peregrinus	LC	breeding	2011-2016	3-4 breeding pairs	C6
Sedge Warbler Acrocephalus schoenobaenus	LC	breeding	2011-2016	1,024-1,313 breeding pairs	B3
Savi's Warbler Locustella luscinioides	LC	breeding	2011-2015	57 breeding pairs	B3
Bluethroat Cyanecula svecica	LC	breeding	2011-2016	995-1,165 breeding pairs	C6
A4iii Species group - waterbirds	n/a	non-breeding	2011-2016	113,256-225,739 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

Threats to the site (pressure)
Threat Level 1	Threat Level 2	Timing	Scope	Severity	Result
Energy production and mining	renewable energy	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low
Human intrusions and disturbance	recreational activities	happening now	some of area/population (10-49%)	no or imperceptible deterioration	low

Conservation actions taken at site (response)
Conservation Designation	Management Planning	Conservation Action	Result
Whole area of site (>90%) covered by appropriate conservation designation	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Some limited conservation initiatives are in place	medium

For more information about IBA monitoring please click here

Protected Area	Designation	Area (ha)	Relationship with IBA	Overlap with IBA (ha)
Sliedrechtse Biesbosch	Nature Reserve	797	protected area contained by site	797
Hollands Diep	Ramsar Site, Wetland of International Importance	4,050	protected area is adjacent to site	0
Dordtse Biesbosch	Nature Reserve	806	protected area contained by site	806
De Biesbosch	National Park	7,100	protected area contained by site	7,100
De Biesbosch	Nationaal Park	8,980	protected area overlaps with site	0
Brabantse Biesbosch	Nature Conservation Law	1,500	protected area contained by site	2,691
Biesbosch	Special Protection Area (Birds Directive)	9,478	is identical to site	8,522
Biesbosch	Site of Community Importance (Habitats Directive)	9,640	is identical to site	9,050
Biesbosch	Ramsar Site, Wetland of International Importance	1,700	protected area overlaps with site	1,700
Biesbosch	Natuurbeschermingswet	9,640	is identical to site	0

IUCN Habitat	Habitat detail	Extent (% of site)
Forest	Alluvial and very wet forest	-
Wetlands (inland)	Standing freshwater, Rivers and streams, Water fringe vegetation	-
Artificial/Terrestrial	Highly improved re-seeded landscapes	-

For further information about the habitat classification please click here.

Land-use	Extent (% of site)
agriculture	-
fisheries/aquaculture	-
water management	-
hunting	-
nature conservation and research	-
tourism/recreation	-
urban/industrial/transport	-
water management	-
other	-

For further information about the land use classification please click here.

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Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Biesbosch. Downloaded from http://www.birdlife.org on 19/01/2022.