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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
Greater White-fronted Goose Anser albifrons	LC	non-breeding	2011-2015	17,728-27,241 individuals	B1i, C3
Common Pochard Aythya ferina	VU	breeding	2011-2015	21-34 breeding pairs	A1, B2, C1
Spotted Crake Porzana porzana	LC	breeding	2011-2015	15-20 breeding pairs	C6
Baillon's Crake Zapornia pusilla	LC	breeding	2011-2015	2-3 breeding pairs	C6
White Stork Ciconia ciconia	LC	breeding	2009-2014	18 breeding pairs	C6
Eurasian Spoonbill Platalea leucorodia	LC	breeding	2009-2014	72 breeding pairs	B1i
Eurasian Bittern Botaurus stellaris	LC	breeding	2011-2015	20-28 breeding pairs	C6
Purple Heron Ardea purpurea	LC	breeding	2011-2015	101-117 breeding pairs	C6
Great White Egret Ardea alba	LC	breeding	2011-2015	3-6 breeding pairs	C6
Black Tern Chlidonias niger	LC	breeding	2011-2015	140-187 breeding pairs	C6
Short-eared Owl Asio flammeus	LC	breeding	2011-2015	1-3 breeding pairs	C6
Sedge Warbler Acrocephalus schoenobaenus	LC	breeding	2011-2015	3,278-4,701 breeding pairs	B3
Savi's Warbler Locustella luscinioides	LC	breeding	2011-2015	339-548 breeding pairs	B3
A4iii Species group - waterbirds	n/a	non-breeding	2011-2015	32,898-48,966 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
Greater White-fronted Goose Anser albifrons	3,800	15,514	individuals	100	favourable
Spotted Crake Porzana porzana	19	15	breeding pairs	79	near favourable
Eurasian Bittern Botaurus stellaris	30	20	breeding pairs	67	unfavourable
Purple Heron Ardea purpurea	65	101	breeding pairs	100	favourable
Black Tern Chlidonias niger	200	140	breeding pairs	70	near favourable
Sedge Warbler Acrocephalus schoenobaenus	2,000	3,278	breeding pairs	100	favourable
Savi's Warbler Locustella luscinioides	300	339	breeding pairs	100	favourable

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 management plan exists but it is out of date or not comprehensive	Unknown	low

Year	Protected Area	Designation	% overlap with IBA
-	De Wieden II	Nature Reserve	3
-	De Wieden	Nature Reserve with Management Subsidy	55
2000	De Wieden	Special Protection Area (Birds Directive)	100
2000	De Wieden	Ramsar Site, Wetland of International Importance	100
2002	De Wieden	Site of Community Importance (Habitats Directive)	84
2003	De Wieden	Natuurbeschermingswet	100
2009	Weerribben-Wieden	Nationaal Park	76

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Water fringe vegetation	73
Artificial/Terrestrial	Highly improved re-seeded landscapes	14
Forest	Alluvial and very wet forest	12

1. IUCN Habitat classification.

Land use	% of IBA
water management	100
tourism/recreation	90
nature conservation and research	62
fisheries/aquaculture	44
agriculture	10
other	9

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: De Wieden (Netherlands). Downloaded from https://datazone.birdlife.org/site/factsheet/de-wieden-iba-netherlands on 23/11/2024.