The site was identified as internationally important for bird conservation in 2002 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.
Species |
Red List |
Season (year/s of estimate) |
Size |
IBA criteria |
Whooper Swan Cygnus cygnus |
LC |
winter (1990–1999) |
2,714 birds |
A4i, B1i, B3, C2, C6 |
Tundra Swan Cygnus columbianus |
LC |
winter (1990–1999) |
1,462 birds |
A4i, B1i, B2, C2 |
Barnacle Goose Branta leucopsis |
LC |
winter (1990–1999) |
289 birds |
C2 |
Bean Goose Anser fabalis |
LC |
winter (1990–1999) |
25,195 birds |
A4i, B1i, C3 |
Greater White-fronted Goose Anser albifrons |
LC |
winter (1990–1999) |
57,696 birds |
A4i, B1i, C3 |
Corncrake Crex crex |
LC |
breeding (1990–1999) |
26 pairs |
A1, C1 |
Common Crane Grus grus |
LC |
breeding (1990–1999) |
9 pairs |
C6 |
Common Crane Grus grus |
LC |
passage (1990–1999) |
850 birds |
B1i, C2, C6 |
White Stork Ciconia ciconia |
LC |
breeding (1994) |
67 pairs |
B2, C6 |
Eurasian Bittern Botaurus stellaris |
LC |
breeding (1980–1989) |
4 pairs |
C6 |
Black Tern Chlidonias niger |
LC |
breeding (1990–1999) |
36 pairs |
C6 |
Short-eared Owl Asio flammeus |
LC |
passage (1990) |
12 birds |
C6 |
Osprey Pandion haliaetus |
LC |
passage (1990) |
5 birds |
C6 |
European Honey-buzzard Pernis apivorus |
LC |
breeding (1990–1999) |
5 pairs |
C6 |
Western Marsh-harrier Circus aeruginosus |
LC |
breeding (1990–1999) |
28 pairs |
C6 |
Hen Harrier Circus cyaneus |
LC |
winter (1990) |
50 birds |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
winter (1990) |
5 birds |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
breeding (1990–1999) |
1 pairs |
C6 |
Red Kite Milvus milvus |
LC |
breeding (1990–1999) |
39 pairs |
C6 |
Black Kite Milvus migrans |
LC |
breeding (1990–1999) |
6 pairs |
C6 |
Common Kingfisher Alcedo atthis |
LC |
breeding (1990–1999) |
22 pairs |
C6 |
Middle Spotted Woodpecker Leiopicus medius |
LC |
breeding (1990–1999) |
80 pairs |
C6 |
Red-backed Shrike Lanius collurio |
LC |
breeding (1990–1999) |
297 pairs |
C6 |
Barred Warbler Curruca nisoria |
LC |
breeding (1990–1999) |
53 pairs |
C6 |
Whinchat Saxicola rubetra |
LC |
breeding (1990–1999) |
523 pairs |
B3 |
A4iii Species group - waterbirds |
n/a |
winter (1990–1999) |
87,356 birds |
A4iii, C4 |