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 |
Bean Goose Anser fabalis |
LC |
passage (1990–1999) |
30,000 birds |
A4i, B1i, C3 |
Greater White-fronted Goose Anser albifrons |
LC |
passage (1997) |
15,000–25,000 birds |
A4i, B1i, C3 |
Smew Mergellus albellus |
LC |
winter (1990–1999) |
280 birds |
B1i, C2 |
Common Pochard Aythya ferina |
VU |
winter (1990–1999) |
4,400 birds |
B1i, C3 |
Northern Shoveler Spatula clypeata |
LC |
passage (1990–1999) |
900 birds |
B1i, C3 |
Gadwall Mareca strepera |
LC |
passage (1990–1999) |
350 birds |
B1i, C3 |
European Nightjar Caprimulgus europaeus |
LC |
breeding (1990–1999) |
40–70 pairs |
C6 |
Corncrake Crex crex |
LC |
breeding (1990–1999) |
20–30 pairs |
A1, C1, C6 |
Spotted Crake Porzana porzana |
LC |
resident (1997) |
5–10 pairs |
B1i |
Little Crake Zapornia parva |
LC |
breeding (1990–1999) |
5–15 pairs |
C6 |
Common Crane Grus grus |
LC |
passage (1990–1999) |
3,000 birds |
A4i, B1i, C2 |
Common Crane Grus grus |
LC |
breeding (1990–1999) |
150–180 pairs |
B2, C6 |
Great Bustard Otis tarda |
EN |
breeding (1997) |
2 pairs |
C6 |
Black Stork Ciconia nigra |
LC |
breeding (1997) |
4–6 pairs |
C6 |
White Stork Ciconia ciconia |
LC |
breeding (1990–1999) |
40–60 pairs |
B2, C6 |
Eurasian Bittern Botaurus stellaris |
LC |
breeding (1990–1999) |
15–20 pairs |
B2, C6 |
Common Little Bittern Ixobrychus minutus |
LC |
breeding (1990–1999) |
1–3 pairs |
C6 |
Great White Egret Ardea alba |
LC |
passage (1990–1999) |
15 birds |
C6 |
Black Tern Chlidonias niger |
LC |
breeding (1990–1999) |
40–60 pairs |
C2, C6 |
Boreal Owl Aegolius funereus |
LC |
breeding (1997) |
1 pairs |
C6 |
Short-eared Owl Asio flammeus |
LC |
breeding (1994) |
3 pairs |
C6 |
Eurasian Eagle-owl Bubo bubo |
LC |
breeding (1990–1999) |
1 pairs |
C6 |
Osprey Pandion haliaetus |
LC |
breeding (1990–1999) |
23–28 pairs |
B2, C6 |
European Honey-buzzard Pernis apivorus |
LC |
breeding (1990–1999) |
10–15 pairs |
C6 |
Lesser Spotted Eagle Clanga pomarina |
LC |
breeding (1990–1999) |
6 pairs |
C6 |
Western Marsh-harrier Circus aeruginosus |
LC |
breeding (1990–1999) |
50–80 pairs |
C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
breeding (1990–1999) |
10–13 pairs |
A1, B2, C1, C6 |
White-tailed Sea-eagle Haliaeetus albicilla |
LC |
winter (1990–1999) |
30–35 birds |
C6 |
Red Kite Milvus milvus |
LC |
breeding (1990–1999) |
50–100 pairs |
B3, C6 |
Black Kite Milvus migrans |
LC |
breeding (1990–1999) |
20–40 pairs |
B2, C6 |
Common Kingfisher Alcedo atthis |
LC |
breeding (1990–1999) |
40–80 pairs |
B2, C6 |
Black Woodpecker Dryocopus martius |
LC |
breeding (1990–1999) |
150–250 pairs |
C6 |
Middle Spotted Woodpecker Leiopicus medius |
LC |
breeding (1990–1999) |
200–250 pairs |
B3, C6 |
Red-backed Shrike Lanius collurio |
LC |
breeding (1990–1999) |
1,000 pairs |
B2, C6 |
Woodlark Lullula arborea |
LC |
resident (1997) |
100–150 pairs |
C6 |
Common Reed-warbler Acrocephalus scirpaceus |
LC |
breeding (1990–1999) |
3,500–4,500 pairs |
B3 |
Savi's Warbler Locustella luscinioides |
LC |
breeding (1990–1999) |
130–180 pairs |
B3 |
Barred Warbler Curruca nisoria |
LC |
breeding (1990–1999) |
200–300 pairs |
B3, C6 |
Bluethroat Luscinia svecica |
LC |
breeding (1990–1999) |
20–30 pairs |
C6 |
Common Nightingale Luscinia megarhynchos |
LC |
breeding (1990–1999) |
600–900 pairs |
B3 |
Red-breasted Flycatcher Ficedula parva |
LC |
breeding (1990–1999) |
110–160 pairs |
C6 |
Ortolan Bunting Emberiza hortulana |
LC |
breeding (1990–1999) |
50–100 pairs |
C6 |
A4iii Species group - waterbirds |
n/a |
passage (1991–1999) |
49,265–59,265 birds |
A4iii, C4 |