Biebrza 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
Black Grouse Lyrurus tetrix LC breeding 2008 107 males C6
Tundra Swan Cygnus columbianus LC passage 2007-2010 300 individuals C2
Greater White-fronted Goose Anser albifrons LC passage 2007-2010 50,000 individuals C3
Eurasian Wigeon Mareca penelope LC passage 2007-2010 25,000 individuals C3
Northern Pintail Anas acuta LC passage 2007-2010 10,000 individuals C3
Corncrake Crex crex LC breeding 2006 700 males C1, C6
Spotted Crake Porzana porzana LC breeding 1991-1997 300-1,500 males C6
Little Crake Zapornia parva LC breeding 1991-1997 27-80 males C6
Common Crane Grus grus LC passage 2009 1,900 individuals C2
Common Crane Grus grus LC breeding 2009 600 breeding pairs C6
Black Stork Ciconia nigra LC breeding 1990-1992 24-26 breeding pairs C6
White Stork Ciconia ciconia LC breeding 2009 300-400 breeding pairs C6
Eurasian Bittern Botaurus stellaris LC breeding 1991-2000 27-120 males C2, C6
Great White Egret Ardea alba LC breeding 2008-2009 10 breeding pairs C6
Eurasian Curlew Numenius arquata NT breeding 2007-2010 50 breeding pairs C1
Black-tailed Godwit Limosa limosa NT breeding 2007-2010 200 breeding pairs C1
Ruff Calidris pugnax LC passage 2007-2010 20,000 individuals C2
Great Snipe Gallinago media NT breeding 1991-1997 400-480 males C1, C2, C6
Whiskered Tern Chlidonias hybrida LC breeding 1991-2000 1-150 breeding pairs C6
Black Tern Chlidonias niger LC breeding 1991-1997 200-700 breeding pairs C2, C6
Short-eared Owl Asio flammeus LC breeding 2008-2009 4 breeding pairs C6
Eurasian Eagle-owl Bubo bubo LC breeding 2005-2009 34-35 breeding pairs C6
Lesser Spotted Eagle Clanga pomarina LC breeding 2005-2009 34-35 breeding pairs C6
Greater Spotted Eagle Clanga clanga VU breeding 2005-2009 21-23 breeding pairs C1, C6
Western Marsh-harrier Circus aeruginosus LC breeding 1991-1997 170-296 breeding pairs C6
Montagu's Harrier Circus pygargus LC breeding 1997 97 breeding pairs C6
White-tailed Sea-eagle Haliaeetus albicilla LC breeding 2005-2009 12-13 breeding pairs C6
Grey-faced Woodpecker Picus canus LC breeding 1990-1997 70-80 breeding pairs C6
White-backed Woodpecker Dendrocopos leucotos LC breeding 2005-2009 100 breeding pairs C6
Aquatic Warbler Acrocephalus paludicola VU breeding 2009 2,528 males C1, C6
Bluethroat Cyanecula svecica LC breeding 2006 100 breeding pairs C6
Red-breasted Flycatcher Ficedula parva LC breeding 1991-1997 250-350 breeding pairs C6
A4iii Species group - waterbirds n/a passage 2007-2010 100,000 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)
2013 very high not assessed medium
Was the whole site covered? Yes State assessed by unset
Accuracy of information unknown

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Agricultural expansion and intensification wood and pulp plantations (includes afforestation) - agro-industry plantations happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Climate change and severe weather habitat shifting and alteration likely in short term (within 4 years) whole area/population (>90%) very rapid to severe deterioration very high
Human intrusions and disturbance recreational activities 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 whole area/population (>90%) very rapid to severe deterioration very high
Natural system modifications dams & water management/use - abstraction of ground water (agricultural use) happening now some of area/population (10-49%) moderate to rapid deterioration high

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Most of site (50-90%) covered (including the most critical parts for important bird species) A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Szelągówka Rezerwat Przyrody 62 protected area overlaps with site 0
Puszcza i Jeziora Augustowskie Obszar Chronionego Krajobrazu 69,575 protected area is adjacent to site 0
Puszcza Augustowska Special Protection Area (Birds Directive) 134,378 protected area is adjacent to site 0
Pojezierze Rajgrodzkie Obszar Chronionego Krajobrazu 14,928 protected area overlaps with site 0
Ostoja Biebrzańska Special Protection Area (Birds Directive) 148,509 protected area contains site 136,900
Ostoja Augustowska Site of Community Importance (Habitats Directive) 107,069 protected area is adjacent to site 0
Dolina Biebrzy Site of Community Importance (Habitats Directive) 121,206 protected area overlaps with site 105,823
Dolina Biebrzy Obszar Chronionego Krajobrazu 28,442 protected area overlaps with site 0
Czapliniec Bełda Rezerwat Przyrody 11 protected area overlaps with site 0
Biebrzański Park Narodowy Park Narodowy 59,740 protected area contained by site 59,223
Biebrzanski National Park (Biebrzanski Park Narodowy) Ramsar Site, Wetland of International Importance 59,233 protected area overlaps with site 59,223


IUCN Habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland, Alluvial and very wet forest -
Other -
Grassland Humid grasslands -
Wetlands (inland) Rivers and streams, Raised bogs, Water fringe vegetation, Fens, transition mires and springs -
Artificial/Terrestrial Highly improved re-seeded landscapes, Other urban and industrial areas, Ruderal land -
For further information about the habitat classification please click here.

Land use

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

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Biebrza river valley. Downloaded from on 30/06/2022.