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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
Barnacle Goose Branta leucopsis	LC	non-breeding (2011–2015)	28,985–32,080 birds	A4i, B1i, C2
Greater White-fronted Goose Anser albifrons	LC	non-breeding (2011–2015)	15,060–24,880 birds	B1i, C3
Gadwall Mareca strepera	LC	non-breeding (2011–2015)	1,147–1,627 birds	B1i, C3

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
Agricultural expansion and intensification	happe­ning now	whole of popul­ation/area (>90%)	rapid decline (>30% over 3 gener­ations)	very high
Invasive and other problematic species and genes	happe­ning now	most of popul­ation/area (50–90%)	rapid decline (>30% over 3 gener­ations)	very high
Human intrusions and disturbance	happe­ning now	most of popul­ation/area (50–90%)	moderate decline (10–30% over 3 gener­ations)	high
Natural system modifications	happe­ning now	few indivi­duals/small area (<10%)	rapid decline (>30% over 3 gener­ations)	low

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 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 (management category)	% coverage of IBA
-	De Deelen	Nature Conservation Law (-)	100
2010	Deelen	Natuurbeschermingswet (IV)	100

Habitat	% of IBA	Habitat detail
Wetlands (inland)	90	Standing freshwater; Water fringe vegetation
Forest	10	Alluvial and very wet forest

Land use	% of IBA
water management	100
nature conservation and research	92
fisheries/aquaculture	50
tourism/recreation	20
hunting	20
agriculture	5
other	5

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Deelen (Netherlands). Downloaded from https://datazone.birdlife.org/site/factsheet/deelen-iba-netherlands on 26/12/2024.