DK100
Tissø, Lille Åmose and Hallenslev Mose


IBA Justification

The site was identified as internationally important for bird conservation in 2000 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:
Species Red List Season (year/s of estimate) Size IBA criteria
Whooper Swan Cygnus cygnus LC passage (1994) 1,993 individuals A4i, B1i, C2
Tundra Swan Cygnus columbianus LC non-breeding (1996) 475 individuals A4i, B1i, B2, C2, C6
Greylag Goose Anser anser LC passage (1994) 2,024 individuals B1i, C3

IBA Conservation

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2010) is shown below.

IBA conservation status
Year of assessment State Pressure Response
2010 very unfavourable not assessed not assessed
Whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the key species' populations)
Species Actual vs Reference (units) % remaining Result
Greylag Goose Anser anser 6,500 / 7,215 (individuals) 91 favourable
Bean Goose Anser fabalis 1,400 / 2,000 (individuals) 70 near favourable
Little Tern Sternula albifrons 2 / 12 (breeding pairs) 17 very unfavourable
Caspian Tern Hydroprogne caspia 1 / 1 (individuals) 100 favourable
Circus cyaneus 5 / 5 (individuals) 100 favourable
Red Kite Milvus milvus 1 / 1 (breeding pairs) 100 favourable

Response (conservation actions taken for the key species and/or their habitats)
Designation Planning Action Result
Not assessed Not assessed Not assessed not assessed

IBA Protection

Year Protected Area Designation (management category) % coverage of IBA
1951 Tissø Fredet ved afgørelse, exl. Kirkeomgivelser (V) <1
1992 Kalundborg Kommune §3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV) 1

Habitats

Habitat % of IBA Habitat detail
Wetlands (inland) 95 Standing freshwater
Artificial/Terrestrial 5 Arable land

Land use

Land use % of IBA
forestry -
hunting -
tourism/recreation -


Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Tissø, Lille Åmose and Hallenslev Mose (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/tissø-lille-åmose-and-hallenslev-mose-iba-denmark on 26/01/2025.