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The site was identified as internationally important for bird conservation in 2002 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Northern Shoveler Spatula clypeata	LC	winter (1990–1999)	606 individuals	B1i, C3
A4iii Species group - waterbirds	n/a	winter (1990–1999)	min 20,000 individuals	A4iii, C4

Year	Protected Area	Designation (management category)	% coverage of IBA
1962	Nördl. Teutoburger Wald-Wiehengebirge	Nature Park (V)	100
2015	Hochwasserrückhaltebecken Alfhausen-Rieste	Naturschutzgebiet (IV)	35

Habitat	% of IBA	Habitat detail
Wetlands (inland)	70	Standing freshwater
Grassland	16	Dry siliceous grassland; Humid grasslands
Forest	5	Broadleaved deciduous woodland; Mixed woodland

Land use	% of IBA
tourism/recreation	-
water management	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Alfsee (Germany). Downloaded from https://datazone.birdlife.org/site/factsheet/alfsee-iba-germany on 14/01/2025.