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Location Sweden, Västra Götaland
Central coordinates 13o 33.00' East  58o 19.00' North
IBA criteria A4i, B1i, B1iv, B2, B3, C2, C3, C5, C6
Area 6,600 ha
Altitude 119 - 158m
Year of IBA assessment 2000

Sveriges Ornitologiska Förening

Site description A shallow calcareous lake that has undergone extensive restoration work over the last five years, involving water-level management. The lake's surroundings are mainly cultivated or cattle-grazed, although there are some forested areas. More than 100,000 people visit the lake each year.

Key Biodiversity The IBA is important for breeding wetland birds, and is a migratory bottleneck site, where up to 10,000 Grus grus regularly pass in spring. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (3-5 passage birds), Crex crex (1-2 breeding pairs), Gallinago media (5-20 passage birds).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta passage  1996  400-500 individuals  good  B1i, C3  Least Concern 
Bean Goose Anser fabalis passage  1996  1,500-2,000 individuals  good  B1i, C3  Least Concern 
Greylag Goose Anser anser passage  1996  1,800-2,000 individuals  good  B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus passage  1996  700-900 individuals  good  A4i, B1i, C2  Least Concern 
Common Teal Anas crecca passage  1996  6,000-7,000 individuals  good  B1i, C3  Least Concern 
Red-necked Grebe Podiceps grisegena breeding  1996  40-60 breeding pairs  good  B1i, C3  Least Concern 
Eurasian Bittern Botaurus stellaris breeding  1996  10-14 breeding pairs  good  B2, C6  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  1996  20-35 breeding pairs  good  C6  Least Concern 
Spotted Crake Porzana porzana breeding  1996  5-25 breeding pairs  good  C6  Least Concern 
Common Crane Grus grus passage  1996  6,000-10,000 individuals  good  A4i, B1i, C2  Least Concern 
Black Tern Chlidonias niger breeding  1996  25-45 breeding pairs  good  C2, C6  Least Concern 
Common Grasshopper-warbler Locustella naevia breeding  1996  30-50 breeding pairs  good  B3  Least Concern 
A4iv Species group - soaring birds/cranes present  B1iv, C5   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bjurum - Dagsnäs Nature Reserve 110 protected area contained by site 110  
Bjurum-Dagsnäs Wildlife and Plant Sanctuary 3,606 protected area overlaps with site 1,982  
Fågeludden, Hornborga Nature Reserve 16 protected area contained by site 16  
Fageluddens Nature Reserve 15 protected area contained by site 15  
Hornborgasjön Nature Reserve 4,095 protected area overlaps with site 4,000  
Hornborgasjön (lake) Wetlands of International Importance (Ramsar) 6,510 is identical to site 6,510  


IUCN habitat Habitat detail Extent (% of site)
Forest Mixed woodland; Native coniferous woodland  15%
Grassland Dry siliceous grassland; Humid grasslands  15%
Wetlands (inland) Raised bogs; Standing freshwater; Water fringe vegetation  50%
Artificial - terrestrial Arable land  20%

Land use

Land-use Extent (% of site)
agriculture 30%
forestry 5%
nature conservation and research 60%
not utilised 25%
tourism/recreation -

Protection status National Partial International High15 ha of IBA covered by Nature Reserve (Fageluddens, 15 ha). IBA overlaps with another Nature Reserve (4,124 ha). 110 ha of IBA covered by Bird Sanctuary (Bjurum-Dagsnäs, 110 ha). 6,350 ha of IBA covered by Ramsar Site (Hornborgasjön, 6,370 ha). IBA overlaps with Special Protection Area.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lake Hornborgasjön. Downloaded from on 26/10/2016

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