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Location Netherlands, Noord-Brabant,Zuid-Holland
Central coordinates 4o 50.00' East  51o 46.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4, C6
Area 9,050 ha
Altitude 0 - 3m
Year of IBA assessment 2000

Vogelbescherming Nederland



Site description A former tidal estuary in the Rhine/Maas river system, sealed off from the sea in 1970 (see Haringvliet, 024) and no longer subject to marine influence. The site consists of a flood-plain, polders, marshland and swamp-forest, and is intersected by many formerly tidal creeks. The site is adjacent to Hollands Diep (025) in the west; it does not include three drinking-water reservoirs within its boundary. Human activities include reed-harvesting (`Other' land-use, below).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater White-fronted Goose Anser albifrons winter  1992  7,878 individuals  good  B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1992  2,179 individuals  good  B1i, B2, C2  Least Concern 
Tundra Swan Cygnus columbianus winter  1992  290 individuals  good  A4i, B1i, B2, C2  Least Concern 
Gadwall Mareca strepera non-breeding  1992  607 individuals  good  B1i, C3  Least Concern 
Eurasian Spoonbill Platalea leucorodia passage  1990  60 individuals  good  B1i, C2  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  1993  55 breeding pairs  medium  C6  Least Concern 
Corncrake Crex crex breeding  1991  5 breeding pairs  good  C6  Least Concern 
Common Kingfisher Alcedo atthis resident  1991  2 breeding pairs  good  C6  Least Concern 
Bluethroat Luscinia svecica breeding  1992  1,783 breeding pairs  medium  C6  Least Concern 
A4iii Species group - waterbirds unknown  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Biesbosch - NL3000040 Habitats Directive 9,678 protected area contains site 9,050  
Biesbosch - NL3009002 Birds Directive 8,529 is identical to site 8,522  
Brabantse Biesbosch Nature Conservation Law 1,500 protected area contained by site 2,691  
De Biesbosch National Park 7,100 protected area contained by site 7,100  
De Biesbosch (southern part) Wetlands of International Importance (Ramsar) 1,700 protected area contained by site 1,700  
Dordtse Biesbosch Nature Reserve 806 protected area contained by site 806  
Sliedrechtse Biesbosch Nature Reserve 797 protected area contained by site 797  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest  16%
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  45%
Artificial - terrestrial Highly improved re-seeded landscapes  39%

Land use

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

Protection status National High International High2,691 ha of IBA covered by Nature Reserve (Brabantse Biesbosch, 2,691 ha). 806 ha of IBA covered by Nature Reserve (Dordtse Biesbosch, 806 ha). 797 ha of IBA covered by Nature Reserve (Sliedrechtse Biesbosch, 797 ha). 7,100 ha of IBA covered by National Park (De Biesbosch, 7,100 ha). 8,850 ha of IBA covered by Special Protection Area (De Biesbosch, 8,850 ha). 1,700 ha of IBA covered by Ramsar Site (De Biesbosch Zuidwaard, 1,700 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Biesbosch. Downloaded from http://www.birdlife.org on 01/11/2014

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