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The site was identified as important in 2000 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
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

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2000) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2016) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Eurasian Bittern Botaurus stellaris	15	75	breeding pairs	100	favourable
White-winged Tern Chlidonias leucopterus	500	250	breeding pairs	50	unfavourable
Black Tern Chlidonias niger	50	200	breeding pairs	100	favourable
Western Marsh-harrier Circus aeruginosus	60	110	breeding pairs	100	favourable
Circus cyaneus	3	2	breeding pairs	67	unfavourable
Aquatic Warbler Acrocephalus paludicola	85	150	breeding pairs	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happening now	whole area/population (>90%)	slow but significant deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation	% overlap with IBA
-	Supoy Marsh	Zakaznik	3
1979	Svidovets'kiy	Regional Zakaznik	13
1979	Boloto Supiy	Regional Zakaznik	3
1994	Usivs'kiy - 2	State Zakaznik	-

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Rivers and streams, Water fringe vegetation, Fens, transition mires and springs	100

1. IUCN Habitat classification.

Land use	% of IBA
not utilised	90
fisheries/aquaculture	5
water management	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Supij marsh (Ukraine). Downloaded from https://datazone.birdlife.org/site/factsheet/supij-marsh-iba-ukraine on 23/11/2024.