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) |
1,600 birds |
A4i, B1i, B3, C2, C6 |
Greylag Goose Anser anser |
LC |
passage (1990–1999) |
3,800 birds |
A4i, B1i, C3 |
Bean Goose Anser fabalis |
LC |
passage (1990–1999) |
28,300 birds |
A4i, B1i, C3 |
Greater White-fronted Goose Anser albifrons |
LC |
passage (1990–1999) |
40,000 birds |
A4i, B1i, C3 |
Smew Mergellus albellus |
LC |
winter (1990–1999) |
290 birds |
B1i, C2 |
Common Pochard Aythya ferina |
VU |
passage (1990–1999) |
12,900 birds |
B1i, C3 |
Northern Shoveler Spatula clypeata |
LC |
passage (1990–1999) |
4,000 birds |
B1i, C3 |
Gadwall Mareca strepera |
LC |
passage (1990–1999) |
850 birds |
B1i, C3 |
Eurasian Wigeon Mareca penelope |
LC |
passage (1997) |
15,300 birds |
B1i, C3 |
Northern Pintail Anas acuta |
LC |
passage (1990–1999) |
4,300 birds |
B1i, C3 |
Common Teal Anas crecca |
LC |
winter (1990–1999) |
9,000 birds |
B1i, C3 |
Corncrake Crex crex |
LC |
breeding (1990–1999) |
150–200 pairs |
A1, A4i, B2, C1, C2, C6 |
Spotted Crake Porzana porzana |
LC |
breeding (1990–1999) |
20–70 pairs |
B1i, B3, C6 |
Little Crake Zapornia parva |
LC |
breeding (1990–1999) |
10–20 pairs |
C6 |
Common Crane Grus grus |
LC |
passage (1990–1999) |
10,000 birds |
A4i, B1i, C2, C6 |
Black Stork Ciconia nigra |
LC |
passage (1990–1999) |
30 birds |
C6 |
Common Little Bittern Ixobrychus minutus |
LC |
breeding (1990–1999) |
2–5 pairs |
C6 |
Great White Egret Ardea alba |
LC |
passage (1990–1999) |
15 birds |
C6 |
Great Cormorant Phalacrocorax carbo |
LC |
passage (1990–1999) |
2,200 birds |
B1i, C3 |
Ruff Calidris pugnax |
LC |
breeding (1990–1999) |
4 pairs |
C6 |
Ruff Calidris pugnax |
LC |
passage (1990–1999) |
4,000 birds |
C6 |
Wood Sandpiper Tringa glareola |
LC |
passage (1990–1999) |
1,600 birds |
C6 |
Little Tern Sternula albifrons |
LC |
breeding (1996) |
5 pairs |
C6 |
Little Tern Sternula albifrons |
LC |
passage (1990–1999) |
50–100 birds |
C6 |
Whiskered Tern Chlidonias hybrida |
LC |
breeding (1996) |
5 pairs |
C6 |
Black Tern Chlidonias niger |
LC |
passage (1990–1999) |
600 birds |
C2, C6 |
Black Tern Chlidonias niger |
LC |
breeding (1990–1999) |
80–160 pairs |
B2, C2, C6 |
European Honey-buzzard Pernis apivorus |
LC |
breeding (1990–1999) |
5 pairs |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
winter (1990–1999) |
60 birds |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
breeding (1990–1999) |
2–4 pairs |
C6 |
Common Kingfisher Alcedo atthis |
LC |
breeding (1990–1999) |
20–25 pairs |
C6 |
Aquatic Warbler Acrocephalus paludicola |
VU |
breeding (1990–1999) |
10–35 pairs |
A1, C1, C6 |
Collared Sand Martin Riparia riparia |
LC |
breeding (1990–1999) |
1,000–3,500 pairs |
B2 |
Barred Warbler Curruca nisoria |
LC |
breeding (1990–1999) |
140–160 pairs |
C6 |
Bluethroat Luscinia svecica |
LC |
breeding (1990–1999) |
20–30 pairs |
C6 |
Common Nightingale Luscinia megarhynchos |
LC |
breeding (1990–1999) |
550–700 pairs |
B3 |
A4iii Species group - waterbirds |
n/a |
passage (1990–1999) |
127,945–127,995 birds |
A4iii, C4 |