|Central coordinates||16o 44.00' East 51o 59.00' North|
|IBA criteria||C3, C4, C6|
|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 Wonieæ channel to the Obra river. The reservoir comprises five former lakes (Drzeczkowskie, Witos³awskie, Wojnowskie, Jezierzyckie, Wonieæ), 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.
|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 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|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Forest||Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland||18%|
|Wetlands (inland)||Standing freshwater; Water fringe vegetation||21%|
|Artificial landscapes (terrestrial)||Arable land; Highly improved re-seeded landscapes; Ruderal land||35%|
|Land-use||Extent (% of site)|
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
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