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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'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Tundra Swan Cygnus columbianus	LC	non-breeding	2011-2015	624-1,507 individuals	B1i, C2, C6
Barnacle Goose Branta leucopsis	LC	non-breeding	2011-2015	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	2011-2015	446-763 individuals	B1i, C2, C6
Tufted Duck Aythya fuligula	LC	non-breeding	2011-2015	12,324-18,218 individuals	B1i, C3
Gadwall Mareca strepera	LC	non-breeding	2011-2015	15,655 individuals	B1i, C3
Eurasian Wigeon Mareca penelope	LC	non-breeding	2011-2015	26,045-45,519 individuals	B1i, C3
Common Teal Anas crecca	LC	non-breeding	2011-2015	7,928-12,054 individuals	B1i, C3
Common Coot Fulica atra	LC	winter	2011-2015	11,167-14,709 individuals	B2
Black-crowned Night-heron Nycticorax nycticorax	LC	breeding	2011-2015	1 breeding pairs	C6
Great White Egret Ardea alba	LC	non-breeding	2011-2015	453-961 individuals	C6
Pied Avocet Recurvirostra avosetta	LC	breeding	2011-2015	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	2011-2015	81,530 individuals	A4i, B1i, C3
Osprey Pandion haliaetus	LC	non-breeding	2011-2015	9-13 individuals	C6
White-tailed Sea-eagle Haliaeetus albicilla	LC	breeding	2011-2015	1-2 breeding pairs	C6
White-tailed Sea-eagle Haliaeetus albicilla	LC	non-breeding	2011-2015	4-6 individuals	C6
Common Kingfisher Alcedo atthis	LC	breeding	2011-2015	22-33 breeding pairs	B2, C6
Peregrine Falcon Falco peregrinus	LC	breeding	2011-2015	3-4 breeding pairs	C6
Sedge Warbler Acrocephalus schoenobaenus	LC	breeding	2011-2015	1,024-1,313 breeding pairs	B3
Savi's Warbler Locustella luscinioides	LC	breeding	2011-2015	57 breeding pairs	B3
Bluethroat Luscinia svecica	LC	breeding	2011-2015	995-1,165 breeding pairs	C6
A4iii Species group - waterbirds	n/a	non-breeding	2011-2015	113,256-225,739 individuals	A4iii, C4

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2016).

Pressure (threats to the trigger species and/or their habitats)
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

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other 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 conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA 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	Nationaal Park	8,980	protected area overlaps with site	0
De Biesbosch	National Park	7,100	protected area contained by site	7,100
Brabantse Biesbosch	Nature Conservation Law	1,500	protected area contained by site	2,691
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
Biesbosch	Special Protection Area (Birds Directive)	9,478	is identical to site	8,522

Habitat (IUCN level 1)	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 more information about the IUCN 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	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Biesbosch. Downloaded from http://datazone.birdlife.org/site/factsheet/biesbosch-iba-netherlands on 04/10/2023.