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Location Poland, kujawsko-pomorskie
Central coordinates 19o 34.00' East  53o 17.00' North
IBA criteria C4, C7
Area 3,136 ha
Altitude 71 - 132m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków



Site description The site lies in the Drwêca river valley between Brodnica town and the road between Jajkowo and G³êboczek villages, and includes the lower parts of the Brynica and Samionka river valleys, Sopieñ lake and Ostrów lake. The valley is 600 m to 3 km in width and includes a canal system and oxbow lakes. The Drwêca river has a natural character and meanders strongly; overflow in early spring causes extensive flooding. The vegetation is species-rich; besides meadows there are reedbeds Phragmites, sedge-beds and small stands of alder Alnus woodland.

Key Biodiversity Over 200 species have been recorded, 140 of them breeding. Species of global conservation concern that do not meet IBA criteria: Aythya nyroca (up to two birds on passage), Haliaeetus albicilla (up to five non-breeding birds), Crex crex (4-9 breeding pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis passage  2004-2009  3,300 individuals  good  C7  Least Concern 
Greater White-fronted Goose Anser albifrons passage  2004-2009  7,000 individuals  good  C7  Least Concern 
A4iii Species group - waterbirds passage  2004-2009  5,000-20,000 individuals  poor  C4   

IBA Monitoring

2010 very high favourable low
Population
Good - based on reliable and complete / representative data

Agricultural expansion and intensification annual & perennial non-timber crops - small-holder farming happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Energy production and mining renewable energy happening now whole area/population (>90%) moderate to rapid deterioration very high
Human intrusions and disturbance recreational activities happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Natural system modifications other ecosystem modifications likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Over-exploitation, persecution and control of species hunting & collecting terrestrial animals - intentional use (species being assessed is the target) happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Over-exploitation, persecution and control of species logging & wood harvesting - unintentional effects: large scale likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high
Pollution excess energy - noise pollution happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Residential and commercial development tourism and recreation areas likely in short term (within 4 years) majority/most of area/population (50-90%) moderate to rapid deterioration high

Artificial - terrestrial   0 0 very poor (< 40%) moderate (70-90%) very unfavourable
Forest   0 0 poor (40-69%) good (> 90%) unfavourable
Grassland   0 0 poor (40-69%) poor (40-69%) very unfavourable

Clanga pomarina Lesser Spotted Eagle 2 2 breeding pairs 100 favourable
Grus grus Common Crane 20 19 breeding pairs 95 favourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  No management planning has taken place  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bagienna Dolina Drwecy - PLB040002 Birds Directive 3,366 protected area contains site 3,136  
Dolina Drwecy - PLH280001 Habitats Directive 12,562 protected area overlaps with site 816  
Drweca Nature Reserve 444 protected area contained by site 1,287  
OChK Doliny Drw_cy w woj. Warmi_sko - mazurskim Protected Landscape Area 721 unknown 0  
OChK Doliny Drwecy w woj. Kujawsko - pomorskim Protected Landscape Area 56,848 protected area contains site 3,136  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland  44%
Grassland Humid grasslands; Mesophile grasslands; Steppes and dry calcareous grassland  41%
Wetlands (inland) Fens, transition mires and springs; Raised bogs; Rivers and streams; Standing freshwater; Water fringe vegetation  4%
Artificial - terrestrial Arable land; Highly improved re-seeded landscapes; Ruderal land  11%

Land use

Land-use Extent (% of site)
agriculture 30%
forestry 40%
not utilised 30%
hunting -

Protection status National High International None1,287 ha of IBA covered by Nature Reserve (Rzeka Drwêca, 1,287 ha). 3,400 ha of IBA covered by Protected Landscape Area (Dolina Drwêcy, 61,641 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Marshy valley of the Drweca river. Downloaded from http://www.birdlife.org on 19/12/2014

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