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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
Corncrake Crex crex	LC	breeding	1999	300-350 males	C1, C6
Black-tailed Godwit Limosa limosa	NT	passage	2004-2009	30 individuals	C1
Black Tern Chlidonias niger	LC	breeding	2004-2009	50-80 breeding pairs	C6
Montagu's Harrier Circus pygargus	LC	breeding	1995-2003	30 breeding pairs	C6
Common Kingfisher Alcedo atthis	LC	breeding	1995-2003	110-140 breeding pairs	C6
Syrian Woodpecker Dendrocopos syriacus	LC	breeding	1996-2009	40-100 breeding pairs	C6
Aquatic Warbler Acrocephalus paludicola	VU	breeding	2009	48 males	C1, C6

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2010).

State (condition of the trigger species' populations)
Scientific name	Common name	Reference population	Actual population	Units	% of population remaining	Result
Chlidonias niger	Black Tern	80	57	breeding pairs	72	near 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
Grassland		0	0	moderate (70-90%)	moderate (70-90%)	unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1	Threat level 2	Timing	Scope	Severity	Result
Agricultural expansion and intensification	annual & perennial non-timber crops - small-holder farming	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Agricultural expansion and intensification	marine and freshwater aquaculture - subsistence/artisinal aquaculture	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Agricultural expansion and intensification	wood and pulp plantations (includes afforestation) - small-holder plantations	happening now	small area/few individuals (<10%)	slow but significant deterioration	low
Biological resource use	hunting & collecting terrestrial animals - intentional use (species being assessed is the target)	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Climate change and severe weather	storms and floods	happening now	majority/most of area/population (50-90%)	no or imperceptible deterioration	low
Energy production and mining	renewable energy	happening now	whole area/population (>90%)	moderate to rapid deterioration	very high
Human intrusions and disturbance	recreational activities	likely in short term (within 4 years)	majority/most of area/population (50-90%)	no or imperceptible deterioration	low
Natural system modifications	dams & water management/use - dams (size unknown)	likely in short term (within 4 years)	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Natural system modifications	other ecosystem modifications	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
No known threats	no known threats	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low
Residential and commercial development	tourism and recreation areas	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Transportation and service corridors	utility & service lines	happening now	whole area/population (>90%)	moderate to rapid deterioration	very high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other conservation action	Result
Not assessed	Not assessed	Not assessed	not assessed

For more information about IBA conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Zachodniowołyńska Dolina Bugu	Site of Community Importance (Habitats Directive)	1,556	protected area overlaps with site	1,473
Strzelecki Park Krajobrazowy	Park Krajobrazowy	12,681	protected area overlaps with site	0
Sobiborski Park Krajobrazowy	Park Krajobrazowy	11,160	protected area is adjacent to site	0
Poleski Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	48,377	protected area overlaps with site	0
Poleska Dolina Bugu	Site of Community Importance (Habitats Directive)	8,173	protected area overlaps with site	8,173
Nadbużański Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	12,123	protected area overlaps with site	0
Nadbużański Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	15,095	protected area overlaps with site	0
Małoziemce	Rezerwat Przyrody	38	protected area overlaps with site	0
Grabowiecko-Strzelecki Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	25,815	protected area overlaps with site	0
Dołhobyczowski Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	9,780	protected area overlaps with site	0
Dolina Środkowego Bugu	Special Protection Area (Birds Directive)	28,097	protected area overlaps with site	25,361

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Forest	Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland, Alluvial and very wet forest	-
Other		-
Grassland	Steppes and dry calcareous grassland, Humid grasslands, Mesophile grasslands	-
Wetlands (inland)	Standing freshwater, Rivers and streams, Water fringe vegetation, Fens, transition mires and springs	-
Artificial/Terrestrial	Highly improved re-seeded landscapes, Arable land, Other urban and industrial areas, Ruderal land	-

For more information about the IUCN Habitat classification, please click here.

Land-use	Extent (% of site)
agriculture	-
forestry	-
urban/industrial/transport	-
not utilised	-
nature conservation and research	-
hunting	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Middle Bug river valley. Downloaded from http://datazone.birdlife.org/site/factsheet/middle-bug-river-valley-iba-poland on 23/09/2023.