email a friend
printable version
Location Poland, lódzkie,wielkopolskie
Central coordinates 19o 4.00' East  52o 4.00' North
IBA criteria C1, C3, C4
Area 6,861 ha
Altitude 90 - 100m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description The Ner valley is a marshy stretch of the Warszawa-Berlin valley between the towns of £êczyca and D¹bie, and adjoins the Bzura river valley. Wet meadows dominate the area, but on low-lying land and adjacent to water there are reedbeds Phragmites in some places, as well as riverine forest and scrub, on the more elevated, drier ground, dry broadleaved forest. The easternmost part of the valley (around £êczyca and B³onia towns) was drained in 1980, and is now less attractive to waterbirds. Other parts of the valley flood annually. The most interesting area ornithologically is around D¹bie town.

Key Biodiversity The most attractive area in central Poland for staging geese and ducks during spring migration. Breeding species of global conservation concern that do not meet IBA criteria: Acrocephalus paludicola (2-3 pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater White-fronted Goose Anser albifrons passage  2006-2009  15,000 individuals  good  C3  Least Concern 
Corncrake Crex crex breeding  2006-2009  41-67 males only  good  C1  Least Concern 
Black-tailed Godwit Limosa limosa breeding  2006-2009  23-39 breeding pairs  good  C1  Near Threatened 
Eurasian Curlew Numenius arquata breeding  2006-2009  9-10 breeding pairs  good  C1  Near Threatened 
Aquatic Warbler Acrocephalus paludicola breeding  2003-2008  1-14 males only  good  C1  Vulnerable 
A4iii Species group - waterbirds passage  2006-2009  20,000 individuals  poor  C4   

IBA Monitoring

2010 very high very unfavourable low
Medium - based upon reliable but incomplete / partially representative data

Energy production and mining renewable energy likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) very rapid to severe deterioration high
Pollution garbage and solid waste happening now small area/few individuals (<10%) slow but significant deterioration low
Transportation and service corridors roads and railroads likely in short term (within 4 years) small area/few individuals (<10%) slow but significant deterioration low

Grassland   0 0 moderate (70-90%) moderate (70-90%) unfavourable
Wetlands (inland) Raised bogs  0 0 moderate (70-90%) moderate (70-90%) unfavourable
Wetlands (inland) Standing freshwater  0 0 moderate (70-90%) moderate (70-90%) unfavourable

Anser albifrons Greater White-fronted Goose 15000 8049 individuals 54 unfavourable
Acrocephalus paludicola Aquatic Warbler 6 1 males only 17 very unfavourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  No management plan exists but the management planning process has begun  Very little or no conservation action taking place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Dolina Bzury Protected Landscape Area 13,500 protected area overlaps with site 2,500  
Pradolina Bzury-Neru - PLH100006 Habitats Directive 21,886 protected area overlaps with site 5,812  
Pradolina Warszawsko-Berlinska - PLB100001 Birds Directive 23,412 protected area overlaps with site 6,318  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Mixed woodland  4%
Grassland Humid grasslands  48%
Wetlands (inland) Raised bogs; Rivers and streams; Standing freshwater; Water fringe vegetation  43%
Artificial - terrestrial   5%

Land use

Land-use Extent (% of site)
agriculture 90%
forestry 5%
not utilised 5%
hunting -

Protection status National Partial International None2,500 ha of IBA covered by Protected Landscape Area (Dolina Bzury, 13,500 ha).

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Ner River Valley. Downloaded from on 27/11/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife