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Location Sweden, Västra Götaland
Central coordinates 12o 36.11' East  58o 23.30' North
IBA criteria B2, C6
Area 4,000 ha
Altitude 43 - 50m
Year of IBA assessment 2000

Sveriges Ornitologiska Förening

Site description Dättern is an almost enclosed bay of Lake Vänern with a Phragmites- dominated shoreline. Large areas of sand and clay are exposed when the water-level is low. The sound connecting Dättern with the main lake becomes ice-free early in the spring. The bay is surrounded by grazed meadows, and there is an ancient Alnus wood, 73 ha in size.

Key Biodiversity The expanses of sand and clay form important resting areas for waders such as Calidris ferruginea. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (non-breeding) and Gallinago media (passage).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Eurasian Bittern Botaurus stellaris breeding  1996  10-12 breeding pairs  B2, C6  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  1996  17 breeding pairs  C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Dättern Wetlands of International Importance (Ramsar) 4,010 is identical to site 4,000  
Dättern etapp 2 Nature Reserve 400 protected area overlaps with site 2,200  
Dättern I Nature Reserve 1,492 protected area overlaps with site 1,450  


IUCN habitat Habitat detail Extent (% of site)
Grassland Humid grasslands  2%
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  98%

Land use

Land-use Extent (% of site)
agriculture -

Protection status National Partial International HighIBA overlaps with Nature Reserve (1,482 ha). 3,320 ha of IBA covered by Ramsar Site (Dättern, 3,920 ha). IBA overlaps with Special Protection Area (1,482 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Dättern. Downloaded from on 28/10/2016

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