|Central coordinates||18o 41.00' East 51o 47.00' North|
|IBA criteria||C1, C2, C3, C4, C6|
|Altitude||90 - 120m|
|Year of IBA assessment||2010|
Ornithological information A notable site for breeding and migrating waterbirds; breeding numbers vary from year to year, depending on the water-level. Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (one pair, irregularly).
Site description A storage reservoir (16 km by 3.5 km) in the lowland valley of the unregulated Warta river, between Skêczniew and Warta towns. Meadows and pastures adjoin the reservoir near Proboszczowice and Dzierz¹¿na villages. Its shoreline is formed by natural valley slopes, side dams (which block the mouths of the Teleszyna and Pichna rivers), and also backwater dams, which limit the flooding area when the water-level is at its highest (maximum area is 4,200 ha). The reservoir bottom was not modified before flooding and, when the water-level is low (minimum area 1,700 ha), a varied terrain with scattered small hollows is exposed. The southern part of the reservoir, which floods only during times of high water, is occupied by a mosaic of meadows and willow Salix scrub with groups of partly dead trees. Highest water-levels are reached in April and May, followed by a slow fall.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Bean Goose Anser fabalis||winter||2004-2008||13,000 individuals||good||C3||Least Concern|
|Mallard Anas platyrhynchos||winter||2004-2008||28,300 individuals||good||C3||Least Concern|
|Common Teal Anas crecca||winter||2004-2008||11,720 individuals||good||C3||Least Concern|
|Great Egret Casmerodius albus||breeding||2008||6 breeding pairs||good||C6||Least Concern|
|Black-tailed Godwit Limosa limosa||breeding||2008||10 breeding pairs||good||C1||Near Threatened|
|Little Gull Larus minutus||passage||1995-2003||2,650 individuals||-||C2||Least Concern|
|Whiskered Tern Chlidonias hybrida||breeding||2008||146 breeding pairs||good||C6||Least Concern|
|A4iii Species group - waterbirds||passage||2004-2008||77,500 individuals||good||C4|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Zbiornik Jeziorsko - PLB100002||Birds Directive||10,186||protected area overlaps with site||8,330|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Raised bogs; Standing freshwater; Water fringe vegetation||95%|
|Land-use||Extent (% of site)|
Management considerations Birds are disturbed by tourism/recreation. Lowering of the water-level too early in the season destroys many nests. The southern part of reservoir is a `silence zone', and is planned as a bird reserve (not yet designated).
Protection status National None International None
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Jeziorsko reservoir. Downloaded from http://www.birdlife.org on 22/05/2013
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