PL074
Woniesc 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 passage 2004-2008 7,000-8,000 individuals C3
Common Little Bittern Ixobrychus minutus LC breeding 2004-2009 23-34 breeding pairs C6
A4iii Species group - waterbirds n/a passage 2004-2008 18,000-22,000 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)
2010 favourable very high low
Was the whole site assessed? State assessed by Accuracy of information
yes population medium

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Ixobrychus minutus 25 25 breeding pairs 100 favourable

State (condition of the trigger species' habitats)
Habitat Habitat detail Reference area (ha) Actual area (ha) Habitat quantity (% remaining) Habitat quality (carrying capacity) Result
Wetlands (inland) Standing freshwater 777 777 - good (> 90%) favourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
Agricultural expansion and intensification marine and freshwater aquaculture - subsistence/artisinal aquaculture happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Biological resource use hunting & collecting terrestrial animals - intentional use (species being assessed is the target) likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Human intrusions and disturbance recreational activities likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Natural system modifications dams & water management/use - dams (size unknown) happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Residential and commercial development tourism and recreation areas likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Whole area of site (>90%) covered by appropriate conservation designation Not assessed Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity low
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 Wonieść Special Protection Area (Birds Directive) 2,802 protected area overlaps with site 2,517
Zachodnie Pojezierze Krzywińskie Site of Community Importance (Habitats Directive) 5,495 protected area overlaps with site 953
Ostoja żółwia błotnego Rezerwat Przyrody 4 protected area contained by site 0
OChK Pojezierze Krzywinsko - Osieckie w woj. Wielkopolskim Protected Landscape Area 51,065 protected area contains site 900
Krzywińsko-Osiecki wraz z zadrzewieniami generała Dezyderego Chłapowskiego i kompleksem leśnym Osieczna-Góra Obszar Chronionego Krajobrazu 65,288 protected area contains site 0

Habitats

Habitat (IUCN level 1) Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland, Alluvial and very wet forest -
Grassland Mesophile grasslands -
Wetlands (inland) Standing freshwater, Water fringe vegetation -
Artificial/Terrestrial Highly improved re-seeded landscapes, Arable land, Ruderal land -
Other -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
agriculture -
fisheries/aquaculture -
forestry -
tourism/recreation -
water management -
hunting -


Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Woniesc reservoir. Downloaded from http://datazone.birdlife.org/site/factsheet/woniesc-reservoir-iba-poland on 30/11/2023.