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Location Poland, lódzkie,wielkopolskie
Central coordinates 18o 41.00' East  51o 47.00' North
IBA criteria C1, C2, C3, C4, C6
Area 11,410 ha
Altitude 90 - 120m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

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.

Populations of IBA trigger species

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 White Egret Ardea alba 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 Hydrocoloeus 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 areas

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)
Grassland Mesophile grasslands  5%
Wetlands (inland) Raised bogs; Standing freshwater; Water fringe vegetation  95%

Land use

Land-use Extent (% of site)
agriculture 20%
water management 80%

Protection status National None International None

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Jeziorsko reservoir. Downloaded from on 18/09/2014

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