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Location Sweden, Södermanland,Uppsala,Västmanland
Central coordinates 16o 41.68' East  59o 30.14' North
IBA criteria A4i, B1i, B2, C2, C3, C6
Area 35,000 ha
Altitude 1 - 30m
Year of IBA assessment 2007

Sveriges Ornitologiska Förening



Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greylag Goose Anser anser winter  2006  4,000-6,000 individuals  medium  A4i, B1i, C3  Least Concern 
Smew Mergellus albellus winter  2006  50-100 individuals  poor  C2  Least Concern 
Eurasian Bittern Botaurus stellaris breeding  2006  20-25 breeding pairs  medium  B2, C2, C6  Least Concern 
White-tailed Sea-eagle Haliaeetus albicilla breeding  2006  4-5 breeding pairs  good  B2, C6  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  2006  20-25 breeding pairs  poor  C6  Least Concern 
Common Crane Grus grus breeding  2006  10-15 breeding pairs  poor  C6  Least Concern 
Common Tern Sterna hirundo breeding  2006  308 breeding pairs  good  C6  Least Concern 
Black Tern Chlidonias niger breeding  2006  5-20 breeding pairs  good  C6  Least Concern 
Black Woodpecker Dryocopus martius breeding  1984  8-10 breeding pairs  poor  C6  Least Concern 
Osprey Pandion haliaetus breeding  2006  35-50 breeding pairs  medium  B2, C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ängsö Nature Reserve 7,224 protected area contained by site 7,250  
Asköviken Nature Reserve 471 protected area contained by site 452  
Asköviken-Sörfjärden Wetlands of International Importance (Ramsar) 12,200 protected area contained by site 12,200  
Biskopen m fl Wildlife and Plant Sanctuary 1 protected area contained by site 10  
Frösåker Nature Reserve 505 protected area contained by site 414  
Fullerö Nature Reserve 120 protected area contained by site 106  
Gäddskallen Wildlife and Plant Sanctuary 4 protected area contained by site 4  
Gimpelstenarna Wildlife and Plant Sanctuary 8 protected area contained by site 8  
Hatten Wildlife and Plant Sanctuary 8 protected area contained by site 7  
Kalvholmen Nature Reserve 38 protected area contained by site 37  
Lilla Blackhäll Wildlife and Plant Sanctuary 4 protected area contained by site 4  
Lilla och Stora Skorven Wildlife and Plant Sanctuary 10 protected area contained by site 7  
Lilla Skorven Wildlife and Plant Sanctuary 3 protected area contained by site 3  
Ormskär Wildlife and Plant Sanctuary 1 protected area contained by site 1  
Ridö-Sundbyholmsarkipelagen Nature Reserve 5,627 protected area contained by site 5,756  
Söderfjärden Nature Reserve 209 protected area contained by site 210  
Stora Blackhäll Wildlife and Plant Sanctuary 9 protected area contained by site 8  
Sundbyholm Nature Conservation Area 766 protected area overlaps with site 175  
Tallgås Wildlife and Plant Sanctuary 5 protected area contained by site 5  
Tedarön Nature Reserve 205 protected area contained by site 207  
Tidö Nature Reserve 425 protected area overlaps with site 403  

Local conservation groups The local conservation group below is working to support conservation at this IBA.

Name Year formed
Västmanlands ornitologiska förening 0

Habitats

IUCN habitat Habitat detail Extent (% of site)
Artificial - terrestrial Arable land  5%
Forest Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland  15%
Grassland Humid grasslands  5%
Wetlands (inland) Standing freshwater; Water fringe vegetation  75%

Land use

Land-use Extent (% of site)
agriculture 5%
fisheries/aquaculture 75%
forestry minor
hunting 100%
military minor
nature conservation and research 35%
tourism/recreation 90%
urban/industrial/transport 5%
water management minor

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Western part of lake Mälaren. Downloaded from http://www.birdlife.org on 01/09/2015

To provide new information to update this factsheet or to correct any errors, please email BirdLife