Ner River Valley

IBA Criteria

Year of most recent IBA criteria assessment: 2010

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Greater White-fronted Goose Anser albifrons LC passage 2006-2009 15,000 individuals C3
Corncrake Crex crex LC breeding 2006-2009 41-67 males C1
Eurasian Curlew Numenius arquata NT breeding 2006-2009 9-10 breeding pairs C1
Black-tailed Godwit Limosa limosa NT breeding 2006-2009 23-39 breeding pairs C1
Aquatic Warbler Acrocephalus paludicola VU breeding 2003-2008 1-14 males C1
A4iii Species group - waterbirds n/a passage 2006-2009 20,000 individuals C4

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

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2011 not assessed near favourable not assessed
Was the whole site covered? No State assessed by Population
Accuracy of information poor

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Pradoliny Warszawsko-Berlińskiej Obszar Chronionego Krajobrazu 36,847 protected area overlaps with site 0
Pradolina Warszawsko-Berlińska Special Protection Area (Birds Directive) 23,412 protected area overlaps with site 6,318
Pradolina Bzury-Neru Site of Community Importance (Habitats Directive) 21,886 protected area overlaps with site 5,812
Dolina Bzury Protected Landscape Area 13,500 protected area overlaps with site 2,500


IUCN Habitat Habitat detail Extent (% of site)
Forest Mixed woodland, Alluvial and very wet forest -
Grassland Humid grasslands -
Wetlands (inland) Standing freshwater, Rivers and streams, Raised bogs, Water fringe vegetation -
Artificial/Terrestrial -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
forestry -
not utilised -
hunting -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Ner River Valley. Downloaded from on 07/05/2021.