|Location||Sweden, Västra Götaland|
|Central coordinates||13o 54.00' East 58o 34.00' North|
|IBA criteria||A4i, B1i, B3, C2, C3|
|Altitude||66 - 70m|
|Year of IBA assessment||2000|
Ornithological information The site is important as a stop-over site for passage waterbirds and waders. Passage species of global conservation concern that do not meet IBA criteria: Anser erythropus, Crex crex and Gallinago media.
Site description A shallow, nutrient-rich lake situated in a generally flat landscape, except for a few higher areas that are covered by coniferous forest. The lake was lowered three times by drainage projects in the nineteenth century and the reclaimed land, now grazed water-meadows, forms an important wader habitat. The rapid water exchange in the lake means that the period of ice-cover is quite short. Livestock-grazing is the main land-use.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Bean Goose Anser fabalis||passage||-||10,500 individuals||-||A4i, B1i, C3||Least Concern|
|Whooper Swan Cygnus cygnus||passage||-||1,000 individuals||-||A4i, B1i, C2||Least Concern|
|Common Grasshopper-warbler Locustella naevia||breeding||-||60 breeding pairs||-||B3||Least Concern|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Östen||Nature Reserve||1,397||protected area overlaps with site||1,010|
|Östen||Wetlands of International Importance (Ramsar)||1,010||is identical to site||1,010|
|Östen - SE0540062||Birds Directive||1,475||protected area contains site||1,020|
|Logården||Nature Reserve||88||protected area overlaps with site||30|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Forest||Native coniferous woodland||minor|
|Wetlands (inland)||Fens, transition mires and springs; Rivers and streams; Standing freshwater; Water fringe vegetation||major|
|Artificial landscapes (terrestrial)||minor|
|Land-use||Extent (% of site)|
Management considerations Habitat deterioration has occurred, and the site is slowly reverting to marsh. An unfavourable water regime is assisting the successional process, and drainage, dredging and reclamation projects are ongoing. Breeding wetland birds have almost disappeared. Management agreements exist between the National Environmental Board and land-owners.
Protection status National High International High IBA overlaps with Nature Reserve (östen, 1,420 ha). 1,010 ha of IBA covered by Ramsar Site (östen, 1,010 ha). IBA overlaps with Special Protection Area.
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Lake Östen. Downloaded from http://www.birdlife.org on 23/05/2013
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