The site was identified as internationally important for bird conservation in 2004 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 |
passage (1999) |
4,100 birds |
A4i, B1i, C2 |
Tundra Swan Cygnus columbianus |
LC |
passage (1999) |
170 birds |
A4i, B1i, C2 |
Barnacle Goose Branta leucopsis |
LC |
passage (1999) |
2,000 birds |
A4i, B1i, C2 |
Greylag Goose Anser anser |
LC |
passage (1999) |
3,000 birds |
A4i, B1i, C3 |
Bean Goose Anser fabalis |
LC |
passage (1999) |
2,300–5,000 birds |
A4i, B1i, C3 |
Greater White-fronted Goose Anser albifrons |
LC |
passage (1999) |
72,500 birds |
A4i, B1i, C3 |
Common Goldeneye Bucephala clangula |
LC |
breeding (1999) |
15,000 birds |
C3 |
Smew Mergellus albellus |
LC |
winter (1999) |
1,200 birds |
A4i, B1i, C2 |
Goosander Mergus merganser |
LC |
breeding (1999) |
3,000 birds |
C3 |
Common Pochard Aythya ferina |
VU |
passage (1999) |
35,000 birds |
A4i, B1i, C3 |
Tufted Duck Aythya fuligula |
LC |
winter (1999) |
50,000 birds |
A4i, B1i, C3 |
Northern Shoveler Spatula clypeata |
LC |
passage (1999) |
3,100 birds |
B1i, C3 |
Gadwall Mareca strepera |
LC |
passage (1999) |
800 birds |
A4i, B1i, C3 |
Eurasian Wigeon Mareca penelope |
LC |
passage (1999) |
19,700 birds |
A4i, B1i, C3 |
Northern Pintail Anas acuta |
LC |
passage (1999) |
12,000 birds |
B1i, C3 |
Great Crested Grebe Podiceps cristatus |
LC |
passage (1999) |
10,000 birds |
C3 |
Corncrake Crex crex |
LC |
breeding (1999) |
435 males |
A1, B2, C1 |
Spotted Crake Porzana porzana |
LC |
breeding (1999) |
170 males |
B3, C6 |
Little Crake Zapornia parva |
LC |
breeding (1999) |
70 males |
C6 |
Eurasian Coot Fulica atra |
LC |
breeding (1999) |
15,000 birds |
C3 |
Common Crane Grus grus |
LC |
passage (1999) |
1,500 birds |
A4i, B1i, C2 |
Black Stork Ciconia nigra |
LC |
breeding (1990) |
4–5 pairs |
C6 |
Eurasian Bittern Botaurus stellaris |
LC |
breeding (1999) |
36 males |
B2, C6 |
Pied Avocet Recurvirostra avosetta |
LC |
breeding (1999) |
5–10 pairs |
C6 |
Ruff Calidris pugnax |
LC |
breeding (1999) |
115 pairs |
C6 |
Dunlin Calidris alpina |
NT |
breeding (1999) |
10 pairs |
C6 |
Great Snipe Gallinago media |
NT |
breeding (1999) |
60 males |
A1, C1 |
Wood Sandpiper Tringa glareola |
LC |
breeding (1999) |
3 pairs |
C6 |
Little Gull Hydrocoloeus minutus |
LC |
breeding (1999) |
30 pairs |
B2 |
Little Gull Hydrocoloeus minutus |
LC |
passage (1999) |
2,500 birds |
A4i, B1i, C2 |
Little Tern Sternula albifrons |
LC |
breeding (1999) |
40–100 pairs |
B2, C6 |
Little Tern Sternula albifrons |
LC |
passage (1999) |
500 birds |
C2 |
Caspian Tern Hydroprogne caspia |
LC |
passage (1999) |
500 birds |
A4i, B1i, C2 |
Whiskered Tern Chlidonias hybrida |
LC |
breeding (1999) |
15 pairs |
C6 |
Black Tern Chlidonias niger |
LC |
breeding (1999) |
500 pairs |
B2, C6 |
Black Tern Chlidonias niger |
LC |
passage (1999) |
15,000 birds |
C2 |
Common Tern Sterna hirundo |
LC |
breeding (1999) |
150 pairs |
C6 |
Short-eared Owl Asio flammeus |
LC |
breeding (1999) |
3 pairs |
C6 |
Eurasian Eagle-owl Bubo bubo |
LC |
breeding (1999) |
3 pairs |
C6 |
Western Marsh-harrier Circus aeruginosus |
LC |
breeding (1999) |
80 pairs |
C6 |
Montagu's Harrier Circus pygargus |
LC |
breeding (1999) |
5–10 pairs |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
breeding (1999) |
9 pairs |
A1, C1 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
winter (1999) |
70–80 birds |
A1, C1 |
Common Kingfisher Alcedo atthis |
LC |
breeding (1999) |
10 pairs |
C6 |
Red-backed Shrike Lanius collurio |
LC |
breeding (1999) |
200 pairs |
C6 |
Aquatic Warbler Acrocephalus paludicola |
VU |
breeding (1999) |
40–50 pairs |
A1, B2, C1 |
Ortolan Bunting Emberiza hortulana |
LC |
breeding (1999) |
3 pairs |
C6 |
A4iv Species group - soaring birds/cranes |
n/a |
passage (1999) |
3,000 birds |
B1iv, C5 |
A4iii Species group - waterbirds |
n/a |
passage (1996–1999) |
100,000-499,999 birds |
A4iii, C4 |