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Location Poland, warminsko-mazurskie
Central coordinates 19o 27.00' East  54o 4.00' North
IBA criteria C3, C4, C6
Area 7,107 ha
Altitude 2 - 10m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description A shallow, nutrient-rich lake (up to 1.5 m deep) surrounded by extensive mires and swamp-forest. There is a significant daily fluctuation in water-level, caused by wind-related water-level fluctuation in the Wiœlany lagoon, which connects with this site via the Elbl¹g river. There is a rich vegetation of floating (Nymphaea) and submerged (Potamogeton) plants, as well as extensive reedbeds Phragmites. Alder Alnus carr occurs along marshy shores.

Key Biodiversity The site regularly supports 20,000 or more waterbirds during spring and autumn migration, mainly wildfowl Anser/Anas. Breeding species of global conservation concern that do not meet IBA criteria: Aythya nyroca (2-3 pairs), Crex crex (2-3 pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis passage  2001-2002  3,000-7,000 individuals  C3  Least Concern 
Whiskered Tern Chlidonias hybrida breeding  2008  170 breeding pairs  good  C6  Least Concern 
Black Tern Chlidonias niger breeding  2008  70 breeding pairs  good  C6  Least Concern 
A4iii Species group - waterbirds passage  2007-2008  10,000-20,000 individuals  good  C4   

IBA Monitoring

2010 not assessed near favourable low
Medium - based upon reliable but incomplete / partially representative data

Forest Alluvial and very wet forest  350 350 100 good (> 90%) favourable
Wetlands (inland) Fens, transition mires and springs  1120 1120 100 moderate (70-90%) near favourable
Wetlands (inland) Water fringe vegetation  1000 1000 100 good (> 90%) favourable

Larus ridibundus Black-headed Gull 3900 3000 breeding pairs 77 near favourable
Chlidonias hybrida Whiskered Tern 170 120 breeding pairs 71 near favourable
Chlidonias niger Black Tern 70 60 breeding pairs 86 near favourable

Whole area of site (>90%) covered by appropriate conservation designation  No management plan exists but the management planning process has begun  Not assessed  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Jezioro Druzno Nature Reserve 3,022 protected area contained by site 3,022  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest  19%
Grassland Humid grasslands  4%
Wetlands (inland) Fens, transition mires and springs; Rivers and streams; Standing freshwater; Water fringe vegetation  74%
Artificial - terrestrial   3%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 10%
tourism/recreation 10%
agriculture 80%
hunting -

Protection status National High International None3,021 ha of IBA covered by Nature Reserve (Jezioro Dru¿no, 3,021 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Druzno lake. Downloaded from on 26/10/2016

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