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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
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
Eurasian 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

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 (2018) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Energy production and mining	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low
Human intrusions and disturbance	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 areas	Management plan	Other 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

Year	Protected Area	Designation	% overlap with IBA
-	Sliedrechtse Biesbosch	Nature Reserve	8
-	Dordtse Biesbosch	Nature Reserve	9
-	Brabantse Biesbosch	Nature Conservation Law	28
1980	Biesbosch	Ramsar Site, Wetland of International Importance	18
1994	De Biesbosch	Nationaal Park	92
1994	De Biesbosch	National Park	75
1996	Biesbosch	Special Protection Area (Birds Directive)	100
1996	Biesbosch	Natuurbeschermingswet	100
1998	Biesbosch	Site of Community Importance (Habitats Directive)	100

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Rivers and streams, Water fringe vegetation	45
Artificial/Terrestrial	Highly improved re-seeded landscapes	39
Forest	Alluvial and very wet forest	16

1. IUCN Habitat classification.

Land use	% of IBA
water management	100
hunting	50
nature conservation and research	49
tourism/recreation	35
agriculture	30
fisheries/aquaculture	30
urban/industrial/transport	16
water management	6
other	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Biesbosch (Netherlands). Downloaded from https://datazone.birdlife.org/site/factsheet/biesbosch-iba-netherlands on 22/11/2024.