Jeziorsko reservoir

IBA Justification

The site was identified as important in 2010 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Bean Goose Anser fabalis LC winter 2004-2008 13,000 individuals C3
Mallard Anas platyrhynchos LC winter 2004-2008 28,300 individuals C3
Common Teal Anas crecca LC winter 2004-2008 11,720 individuals C3
Great White Egret Ardea alba LC breeding 2008 6 breeding pairs C6
Black-tailed Godwit Limosa limosa NT breeding 2008 10 breeding pairs C1
Little Gull Hydrocoloeus minutus LC passage 1995-2003 2,650 individuals C2
Whiskered Tern Chlidonias hybrida LC breeding 2008 146 breeding pairs C6
A4iii Species group - waterbirds n/a passage 2004-2008 77,500 individuals C4

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2010).

IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2011 favourable not assessed not assessed
Was the whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Anser fabalis Bean Goose 1910 12700 individuals 100 favourable
Chlidonias hybrida Whiskered Tern 30 60 breeding pairs 100 favourable

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Not assessed Not assessed Not assessed not assessed
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Zbiornik Jeziorsko Special Protection Area (Birds Directive) 10,186 protected area overlaps with site 8,330
Uniejowski Obszar Chronionego Krajobrazu 14,980 protected area overlaps with site 0
Nadwarciański Obszar Chronionego Krajobrazu 29,597 protected area overlaps with site 0
Jeziorsko Rezerwat Przyrody 1,968 protected area overlaps with site 0


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Grassland Mesophile grasslands -
Wetlands (inland) Standing freshwater, Raised bogs, Water fringe vegetation -
For more information about the IUCN Habitat classification, please click here.

Land use

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

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Jeziorsko reservoir. Downloaded from on 06/12/2023.