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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	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

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

Threats to the site (pressure)
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

Condition of habitat (state)
Habitat	Habitat Detail	Reference Area (ha)	Actual Area (ha)	% of habitat remaining	% of carrying capacity (overall)	Result
Wetlands (inland)	Standing freshwater	777	777	-	good (> 90%)	favourable

Condition of key/trigger populations (state)
Scientific	Common	TargetPop	ActualPop	Units	Remaining	Result
Ixobrychus minutus		25	25	breeding pairs	100	favourable

Conservation actions taken at site (response)
Conservation Designation	Management Planning	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 monitoring please click here

Protected Area	Designation	Area (ha)	Relationship with IBA	Overlap 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

IUCN Habitat	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 further information about the habitat classification please click here.

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

For further information about the land use classification please click here.

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Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Woniesc reservoir. Downloaded from http://www.birdlife.org on 26/03/2023.