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The site was identified as internationally important for bird conservation in 2010 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Corncrake Crex crex	LC	breeding (2004–2009)	250–350 males	C1, C6
Spotted Crake Porzana porzana	LC	breeding (2001–2009)	90–100 males	C6
Little Crake Zapornia parva	LC	breeding (2001–2009)	35–37 males	C6
Common Little Bittern Ixobrychus minutus	LC	breeding (2004–2009)	17 breeding pairs	C6
Eurasian Curlew Numenius arquata	NT	passage (2004–2009)	150 individuals	C1
Black-tailed Godwit Limosa limosa	NT	breeding (2004–2009)	260–270 breeding pairs	C1
Black-tailed Godwit Limosa limosa	NT	passage (2002–2009)	800 individuals	C1
Short-eared Owl Asio flammeus	LC	passage (2004–2009)	6 individuals	C6
Western Marsh-harrier Circus aeruginosus	LC	breeding (2004–2009)	63–68 breeding pairs	C6
Syrian Woodpecker Dendrocopos syriacus	LC	breeding (2004–2009)	24–27 breeding pairs	C6
A4iii Species group - waterbirds	n/a	passage (2004–2009)	44,000–52,000 individuals	C4

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2010. The most recent assessment (2008) is shown below.

Pressure (threats to the key species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Climate change and severe weather	happen­ing now	whole popul­ation/area (>90%)	moderate deteri­oration (10–30% in 3 gener­ations)	very high
Agricultural expansion and intensification	happen­ing now	whole popul­ation/area (>90%)	slow deteri­oration (1–10% over 3 gener­ations)	high
Biological resource use	happen­ing now	most of popul­ation/area (50–90%)	slow deteri­oration (1–10% over 3 gener­ations)	high
Pollution	happen­ing now	some of popul­ation/area (10–49%)	moderate deteri­oration (10–30% in 3 gener­ations)	high
Energy production and mining	happen­ing now	some of popul­ation/area (10–49%)	no deteri­oration (<1% over 3 gener­ations)	low
Human intrusions and disturbance	happen­ing now	some of popul­ation/area (10–49%)	no deteri­oration (<1% over 3 gener­ations)	low
Natural system modifications	happen­ing now	few individ­uals/small area (<10%)	no deteri­oration (<1% over 3 gener­ations)	low
No known threats	happen­ing now	few individ­uals/small area (<10%)	no deteri­oration (<1% over 3 gener­ations)	low
Residential and commercial development	happen­ing now	few individ­uals/small area (<10%)	no deteri­oration (<1% over 3 gener­ations)	low
Transportation and service corridors	likely in short term (within 4 years)	few individ­uals/small area (<10%)	slow deteri­oration (1–10% over 3 gener­ations)	low

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Whole area of site (>90%) covered by appropriate conservation designation	No manage­ment planning has taken place	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation (management category)	% coverage of IBA
1986	Nadnidziański Park Krajobrazowy	Park Krajobrazowy (V)	13
1995	Umianowice	Ecological Area (-)	2

Habitat	% of IBA	Habitat detail
Grassland	60	Steppes and dry calcareous grassland; Humid grasslands; Mesophile grasslands
Wetlands (inland)	30	Standing freshwater; Rivers and streams; Water fringe vegetation; Fens, transition mires and springs
Artificial/Terrestrial	5	Highly improved re-seeded landscapes; Arable land
Forest	5	Native coniferous woodland; Alluvial and very wet forest

Land use	% of IBA
agriculture	70
not utilised	30
hunting	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Nida Rivar Valley (Poland). Downloaded from https://datazone.birdlife.org/site/factsheet/nida-rivar-valley-iba-poland on 24/01/2025.