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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
Greater White-fronted Goose Anser albifrons	LC	non-breeding (2011–2015)	17,728–27,241 birds	B1i, C3
Common Pochard Aythya ferina	VU	breeding (2011–2015)	21–34 pairs	A1, B2, C1
Spotted Crake Porzana porzana	LC	breeding (2011–2015)	15–20 pairs	C6
Baillon's Crake Zapornia pusilla	LC	breeding (2011–2015)	2–3 pairs	C6
White Stork Ciconia ciconia	LC	breeding (2009–2014)	18 pairs	C6
Eurasian Spoonbill Platalea leucorodia	LC	breeding (2009–2014)	72 pairs	B1i
Eurasian Bittern Botaurus stellaris	LC	breeding (2011–2015)	20–28 pairs	C6
Purple Heron Ardea purpurea	LC	breeding (2011–2015)	101–117 pairs	C6
Great White Egret Ardea alba	LC	breeding (2011–2015)	3–6 pairs	C6
Black Tern Chlidonias niger	LC	breeding (2011–2015)	140–187 pairs	C6
Short-eared Owl Asio flammeus	LC	breeding (2011–2015)	1–3 pairs	C6
Sedge Warbler Acrocephalus schoenobaenus	LC	breeding (2011–2015)	3,278–4,701 pairs	B3
Savi's Warbler Locustella luscinioides	LC	breeding (2011–2015)	339–548 pairs	B3
A4iii Species group - waterbirds	n/a	non-breeding (2011–2015)	32,898–48,966 birds	A4iii, C4

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	Actual vs Reference (units)	% remaining	Result
Greater White-fronted Goose Anser albifrons	15,514 / 3,800 (birds)	100	good
Spotted Crake Porzana porzana	15 / 19 (pairs)	79	moderate
Eurasian Bittern Botaurus stellaris	20 / 30 (pairs)	67	poor
Purple Heron Ardea purpurea	101 / 65 (pairs)	100	good
Black Tern Chlidonias niger	140 / 200 (pairs)	70	moderate
Sedge Warbler Acrocephalus schoenobaenus	3,278 / 2,000 (pairs)	100	good
Savi's Warbler Locustella luscinioides	339 / 300 (pairs)	100	good

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	A management plan exists, but it is out of date or not compre­hensive	Unknown	low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 (management category)	% coverage of IBA
-	De Wieden	Nature Reserve with Management Subsidy (-)	55
-	De Wieden II	Nature Reserve (-)	3
2003	De Wieden	Natuurbeschermingswet (IV)	100
2009	Weerribben-Wieden	Nationaal Park (II)	76

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

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 24/12/2024.