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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.

Key Biodiversity 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).

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   

IBA Monitoring

2010 high near favourable low
Population
Medium - based upon reliable but incomplete / partially representative data

Agricultural expansion and intensification annual & perennial non-timber crops - small-holder farming happening now some of area/population (10-49%) slow but significant deterioration medium
Agricultural expansion and intensification marine and freshwater aquaculture - subsistence/artisinal aquaculture happening now small area/few individuals (<10%) no or imperceptible deterioration low
Climate change and severe weather storms and floods happening now some of area/population (10-49%) no or imperceptible deterioration low
Energy production and mining renewable energy happening now small area/few individuals (<10%) no or imperceptible deterioration low
Human intrusions and disturbance recreational activities happening now small area/few individuals (<10%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - unspecified species happening now majority/most of area/population (50-90%) slow but significant deterioration high
Natural system modifications dams & water management/use - abstraction of surface water (agricultural use) happening now majority/most of area/population (50-90%) slow but significant deterioration high
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) moderate to rapid deterioration high
Pollution domestic & urban waste water - type unknown/unrecorded happening now majority/most of area/population (50-90%) no or imperceptible deterioration low
Residential and commercial development tourism and recreation areas happening now small area/few individuals (<10%) no or imperceptible deterioration low

Grassland   0 0 good (> 90%) moderate (70-90%) near favourable
Wetlands (inland)   0 0 good (> 90%) very poor (< 40%) very unfavourable
Wetlands (inland) Standing freshwater  0 0 good (> 90%) good (> 90%) favourable

Anser fabalis Bean Goose 13000 1910 individuals 15 not assessed
Anas platyrhynchos Mallard 10000 10000 individuals 100 not assessed
Anas crecca Common Teal 11720 8900 individuals 76 near favourable
Ardea alba Great White Egret 6 300 individuals 100 favourable
Chlidonias hybrida Whiskered Tern 146 30 breeding pairs 21 not assessed

Some of site covered (10-49%)  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  low 

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  

Habitats

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 http://www.birdlife.org on 26/12/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife