The site was identified as internationally important for bird conservation in 2005 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 |
Greylag Goose Anser anser |
LC |
passage (1995) |
200–500 birds |
B1i |
Bean Goose Anser fabalis |
LC |
passage (1995) |
2,000–10,000 birds |
A4i, B1i |
Greater White-fronted Goose Anser albifrons |
LC |
passage (1995) |
10,000–30,000 birds |
A4i, B1i |
Lesser White-fronted Goose Anser erythropus |
VU |
passage (1995) |
50–250 birds |
B1i |
Common Pochard Aythya ferina |
VU |
breeding (1995) |
1,500–2,000 pairs |
B1i |
Ferruginous Duck Aythya nyroca |
NT |
breeding (1995) |
50–150 pairs |
A1 |
Garganey Spatula querquedula |
LC |
breeding (1995) |
6,000–10,000 pairs |
A4i, B1i, B2 |
Gadwall Mareca strepera |
LC |
breeding (1995) |
600–800 pairs |
A4i, B1i, B2 |
Eurasian Wigeon Mareca penelope |
LC |
passage (1995) |
10,000–20,000 birds |
A4i, B1i |
Mallard Anas platyrhynchos |
LC |
breeding (1995) |
10,000–15,000 pairs |
B1i |
Corncrake Crex crex |
LC |
breeding (1995) |
500–2,000 pairs |
A1 |
Spotted Crake Porzana porzana |
LC |
breeding (1996) |
700 pairs |
B3 |
Little Crake Zapornia parva |
LC |
breeding (1996) |
300 pairs |
B3 |
Black Stork Ciconia nigra |
LC |
breeding (1995) |
50–70 pairs |
A4i, B1i, B2 |
White Stork Ciconia ciconia |
LC |
breeding (1995) |
300–500 pairs |
B2 |
Black-tailed Godwit Limosa limosa |
NT |
breeding (1986) |
500–1,000 pairs |
B2 |
Great Snipe Gallinago media |
NT |
breeding (1995) |
1,000 pairs |
A1 |
Common Redshank Tringa totanus |
LC |
breeding (1986) |
1,000 pairs |
A4i, B1i, B2 |
Little Gull Hydrocoloeus minutus |
LC |
breeding (1996) |
50–100 pairs |
B2 |
Little Tern Sternula albifrons |
LC |
breeding (1986) |
150–250 pairs |
B1i, B2 |
White-winged Tern Chlidonias leucopterus |
LC |
breeding (1995) |
3,000–7,000 pairs |
A4i, B1i |
Black Tern Chlidonias niger |
LC |
breeding (1995) |
500–1,000 pairs |
A4i, B1i, B2 |
Short-eared Owl Asio flammeus |
LC |
resident (1996) |
30–60 pairs |
B2 |
Tawny Owl Strix aluco |
LC |
resident (1990) |
300 pairs |
B3 |
Eurasian Eagle-owl Bubo bubo |
LC |
breeding (1990) |
10–20 pairs |
B2 |
Greater Spotted Eagle Clanga clanga |
VU |
breeding (2001) |
13–20 pairs |
A1 |
Montagu's Harrier Circus pygargus |
LC |
breeding (1995) |
50 pairs |
B3 |
European Roller Coracias garrulus |
LC |
breeding (1986) |
30 pairs |
B2 |
Aquatic Warbler Acrocephalus paludicola |
VU |
breeding (1996) |
150–400 males |
A1 |
Collared Sand Martin Riparia riparia |
LC |
breeding (1986) |
20,000–30,000 pairs |
B2 |
A4iii Species group - waterbirds |
n/a |
passage (1995) |
80,000 birds |
A4iii |
A4iii Species group - waterbirds |
n/a |
breeding (1995) |
26,000–43,000 pairs |
A4iii |