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

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
Aquatic Warbler Acrocephalus paludicola	VU	breeding	2009	38-40 males	C1, C6
A4iii Species group - waterbirds	n/a	passage	2009	16,000-25,000 individuals	C4

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

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	some of area/population (10-49%)	slow but significant deterioration	medium
Biological resource use	gathering terrestrial plants - unintentional effects (species being assessed is not the target)	happening now	majority/most of area/population (50-90%)	very rapid to severe deterioration	very high
Invasive and other problematic species and genes	invasive non-native/alien species/diseases - unspecified species	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Natural system modifications	dams & water management/use - dams (size unknown)	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Natural system modifications	fire & fire suppression - increase in fire frequency/intensity	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Natural system modifications	other ecosystem modifications	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Pollution	domestic & urban waste water - type unknown/unrecorded	happening now	majority/most of area/population (50-90%)	slow but significant 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90%) covered by appropriate conservation designation	A management plan exists but it is out of date or not comprehensive	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	medium

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)
Ostoja w Dolinie Górnej Narwi	Site of Community Importance (Habitats Directive)	19,090	protected area is adjacent to site	0
Narwiańskie Bagna	Site of Community Importance (Habitats Directive)	6,823	protected area contained by site	6,823
Narwiański Park Narodowy	Park Narodowy	6,807	protected area contained by site	7,350
Narew River National Park	Ramsar Site, Wetland of International Importance	7,350	protected area overlaps with site	7,350
Dolina Narwi	Obszar Chronionego Krajobrazu	43,146	protected area is adjacent to site	0
Dolina Górnej Narwi	Special Protection Area (Birds Directive)	18,384	protected area is adjacent to site	0
Bagienna Dolina Narwi	Special Protection Area (Birds Directive)	23,471	protected area overlaps with site	23,471

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, Raised bogs, Water fringe vegetation, Fens, transition mires and springs	-
Artificial/Terrestrial	Highly improved re-seeded landscapes, Arable land, Ruderal land	-

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

Land-use	Extent (% of site)
agriculture	-
nature conservation and research	-
tourism/recreation	-
water management	-
hunting	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Marshy Valley of the Narew River. Downloaded from http://datazone.birdlife.org/site/factsheet/marshy-valley-of-the-narew-river-iba-poland on 08/12/2023.