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) |
1,300 birds |
A4i, B1i, B3, C2, C6 |
Tundra Swan Cygnus columbianus |
LC |
passage (1990–1999) |
450 birds |
A4i, B1i, C2 |
Barnacle Goose Branta leucopsis |
LC |
winter (1990–1999) |
300 birds |
C2, C6 |
Greylag Goose Anser anser |
LC |
passage (1990–1999) |
12,000 birds |
A4i, B1i, C3 |
Bean Goose Anser fabalis |
LC |
passage (1990–1999) |
60,000 birds |
A4i, B1i, C3 |
Greater White-fronted Goose Anser albifrons |
LC |
passage (1990–1999) |
60,000 birds |
A4i, B1i, C3 |
Common Pochard Aythya ferina |
VU |
passage (1997) |
3,500 birds |
B1i, C3 |
Ferruginous Duck Aythya nyroca |
NT |
breeding (2001) |
1 pairs |
C6 |
Northern Shoveler Spatula clypeata |
LC |
passage (1990–1999) |
1,550 birds |
B1i, C3 |
Gadwall Mareca strepera |
LC |
passage (1990–1999) |
450 birds |
B1i, C3 |
Northern Pintail Anas acuta |
LC |
passage (1990–1999) |
2,000 birds |
B1i, C3 |
Corncrake Crex crex |
LC |
breeding (1990–1999) |
20–55 pairs |
A1, A4i, B1i, C1, C2, C6 |
Spotted Crake Porzana porzana |
LC |
breeding (1990–1999) |
10–50 pairs |
C6 |
Common Crane Grus grus |
LC |
winter (1990–1999) |
2,100 birds |
A4i, B1i, C2 |
Common Crane Grus grus |
LC |
breeding (2002) |
25–27 pairs |
C6 |
Eurasian Bittern Botaurus stellaris |
LC |
breeding (1990–1999) |
10–15 pairs |
C2, C6 |
Common Little Bittern Ixobrychus minutus |
LC |
breeding (2001) |
1 pairs |
C2 |
Ruff Calidris pugnax |
LC |
passage (1997) |
1,400 birds |
C6 |
Ruff Calidris pugnax |
LC |
breeding (1990–1999) |
6 pairs |
C6 |
Wood Sandpiper Tringa glareola |
LC |
passage (1990–1999) |
1,200 birds |
C6 |
Black Tern Chlidonias niger |
LC |
passage (1990–1999) |
320 birds |
C2, C6 |
Black Tern Chlidonias niger |
LC |
breeding (1990–1999) |
70–120 pairs |
B2, C2, C6 |
Common Tern Sterna hirundo |
LC |
breeding (1990–1999) |
20–35 pairs |
C6 |
Short-eared Owl Asio flammeus |
LC |
breeding (1990–1999) |
1 pairs |
C6 |
Western Marsh-harrier Circus aeruginosus |
LC |
breeding (1990–1999) |
30–40 pairs |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
breeding (2002) |
3–4 pairs |
C6 |
Black Kite Milvus migrans |
LC |
breeding (1997) |
8–12 pairs |
C6 |
Bluethroat Luscinia svecica |
LC |
breeding (2001) |
10–15 pairs |
C6 |
A4iv Species group - soaring birds/cranes |
n/a |
passage (1995) |
3,000–8,000 birds |
B1iv, C5 |
A4iii Species group - waterbirds |
n/a |
passage (1991–1999) |
142,870 birds |
A4iii, C4 |
A4iii Species group - waterbirds |
n/a |
passage (1991–1999) |
142,870 birds |
A4iii, C4 |