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close| Location | Denmark, Ribe Amtskommune |
| Central coordinates | 8o 15.00' East 55o 42.00' North |
| IBA criteria | A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6 |
| Area | 4,270 ha |
| Altitude | 0 - 27m |
| Year of IBA assessment | 2000 |
Ornithological information An exceptionally important staging area, particularly for Anser brachyrhynchus and A. anser. Botaurus stellaris, Branta leucopsis, Circus aeruginosus and Lanius collurio, listed on Annex I of the EC Birds Directive, breed at the site.
Site description Mainly open agricultural land on a drained former lake with some small plantations. The site also includes two shallow lakes surrounded by reedbeds with Alnus forest and some heathland.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Pink-footed Goose Anser brachyrhynchus | passage | 1994 | 30,000 individuals | good | A4i, B1i, C3 | Least Concern |
| Greylag Goose Anser anser | passage | 1994 | 22,000 individuals | medium | A4i, B1i, C3 | Least Concern |
| Whooper Swan Cygnus cygnus | winter | 1994 | 471 individuals | good | B1i, B3, C2 | Least Concern |
| Tundra Swan Cygnus columbianus | winter | 1995 | 479 individuals | good | A4i, B1i, B2, C2, C6 | Least Concern |
| Northern Pintail Anas acuta | non-breeding | 1994 | 3,000 individuals | medium | B1i, C3 | Least Concern |
| A4iii Species group - waterbirds | passage | 1994 | - | unknown | A4iii, C4 |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Blåbjerg Egekrat, Lyngbos Hede og Hennegårds Klitter - DK00AX172 | Habitats Directive | 694 | protected area is adjacent to site | 0 | |
| Fiilsø - DK00AX056 | Birds Directive | 4,248 | is identical to site | 4,138 | |
| Filso | Wetlands of International Importance (Ramsar) | 4,270 | protected area contains site | 4,270 |
|
| Kallesmærsk Hede, Grærup Langsø, Fiilsø og Kærgård Klitplantage - DK00AX173 | Habitats Directive | 11,636 | protected area contains site | 4,270 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Shrubland | Heathland | 20% |
| Wetlands (inland) | Standing freshwater | 80% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| agriculture | 40% |
| forestry | 5% |
| unknown | 55% |
Management considerations In 1994 the first phase of a large restoration project to remove invasive Salix, Pinus mugo and other trees was implemented; the water-level was raised by 30 cm and further increases are planned.
Protection status National Partial International High4,270 ha of IBA covered by Ramsar Site (Fiilsø, 4,320 ha). 1,994 ha of IBA covered by Special Protection Area (Fiilsø, 1,994 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Fiilsø. Downloaded from http://www.birdlife.org on 24/05/2013
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