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close| Location | Poland, wielkopolskie |
| Central coordinates | 16o 44.00' East 51o 59.00' North |
| IBA criteria | C3, C4, C6 |
| Area | 2,738 ha |
| Altitude | 100 m |
| Year of IBA assessment | 2010 |
Ornithological information The globally threatened Aythya nyroca has not bred here since 1995, but the habitat remains and it is believed there is a good chance that it could breed here again, therefore criterion B2 is still applied. Breeding species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (one pair). Other notable breeding species include Anas strepera (22 pairs) and Chlidonias niger (20-60 pairs).
Site description A storage reservoir (777 ha) on the Samica river, connected by the Wonieœæ channel to the Obra river. The reservoir comprises five former lakes (Drzeczkowskie, Witos³awskie, Wojnowskie, Jezierzyckie, Wonieœæ), connected by a narrow channel (c.13 km long, 200-1,300 m wide), with meadows between them. A dam and sluice divide the upper part of the reservoir, where aquatic vegetation is well-developed, from the lower, where such vegetation is very localized. Adjacent there are fish-ponds, forests, meadows and cultivated fields. The reservoir stores water for agriculture and fire-fighting.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Bean Goose Anser fabalis | passage | 2004-2008 | 7,000-8,000 individuals | good | C3 | Least Concern |
| Little Bittern Ixobrychus minutus | breeding | 2004-2009 | 23-34 breeding pairs | good | C6 | Least Concern |
| A4iii Species group - waterbirds | passage | 2004-2008 | 18,000-22,000 individuals | good | C4 |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| OChK Pojezierze Krzywinsko - Osieckie w woj. Wielkopolskim | Protected Landscape Area | 51,065 | protected area contains site | 900 |
|
| Zachodnie Pojezierze Krzywinskie - PLH300014 | Habitats Directive | 5,495 | protected area overlaps with site | 953 | |
| Zbiornik Woniesc - PLB300005 | Birds Directive | 2,802 | protected area overlaps with site | 2,517 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Forest | Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland | 18% |
| Grassland | Mesophile grasslands | 24% |
| Wetlands (inland) | Standing freshwater; Water fringe vegetation | 21% |
| Artificial landscapes (terrestrial) | Arable land; Highly improved re-seeded landscapes; Ruderal land | 35% |
| Other | 2% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| agriculture | 10% |
| fisheries/aquaculture | 75% |
| forestry | 5% |
| tourism/recreation | 15% |
| water management | 40% |
| hunting | - |
Management considerations Birds are disturbed by fisheries, hunting, tourism and angling, and are also threatened by rapid changes in water-level.
Protection status National High International None900 ha of IBA covered by Protected Landscape Area (Krzywiñsko-Osiecki, 71,425 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Woniesc reservoir. Downloaded from http://www.birdlife.org on 20/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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