• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species

Species	Current IUCN Red List Category	Season	Year(s) of estimate	Population estimate	IBA Criteria Triggered
Eurasian Bittern Botaurus stellaris	LC	breeding	1996	200-300 breeding pairs	B2
Black Tern Chlidonias niger	LC	breeding	1996	400-500 breeding pairs	B2
Aquatic Warbler Acrocephalus paludicola	VU	breeding	1996	500-1,000 breeding pairs	A1, B2

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	annual & perennial non-timber crops - scale unknown/unrecorded	happening now	whole area/population (>90%)	slow but significant deterioration	high

Condition of key/trigger populations (state)
Scientific	Common	TargetPop	ActualPop	Units	Remaining	Result
Botaurus stellaris	Eurasian Bittern	15	75	breeding pairs	100	favourable
Chlidonias leucopterus	White-winged Tern	500	250	breeding pairs	50	unfavourable
Chlidonias niger	Black Tern	50	200	breeding pairs	100	favourable
Circus aeruginosus	Western Marsh-harrier	60	110	breeding pairs	100	favourable
Circus cyaneus		3	2	breeding pairs	67	unfavourable
Acrocephalus paludicola	Aquatic Warbler	85	150	breeding pairs	100	favourable

Conservation actions taken at site (response)
Conservation Designation	Management Planning	Conservation Action	Result
Not assessed	Not assessed	Not assessed	not assessed

For more information about IBA monitoring please click here

Protected Area	Designation	Area (ha)	Relationship with IBA	Overlap with IBA (ha)
Usivs'kiy - 2	State Zakaznik	1,448	protected area overlaps with site	0
Svidovets'kiy	Regional Zakaznik	893	protected area overlaps with site	0
Supoy Marsh	Zakaznik	209	protected area contained by site	209
Boloto Supiy	Regional Zakaznik	209	protected area overlaps with site	0

IUCN Habitat	Habitat detail	Extent (% of site)
Wetlands (inland)	Standing freshwater, Rivers and streams, Water fringe vegetation, Fens, transition mires and springs	-

For further information about the habitat classification please click here.

Land-use	Extent (% of site)
fisheries/aquaculture	-
water management	-
not utilised	-

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

---

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Supij marsh. Downloaded from http://www.birdlife.org on 27/03/2023.