Jeziorsko reservoir

IBA Criteria

Year of most recent IBA criteria assessment: 2010

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
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

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2011 not assessed favourable not assessed
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap 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


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

Land use

Land-use Extent (% of site)
agriculture -
water management -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Jeziorsko reservoir. Downloaded from on 07/02/2023.