|Central coordinates||19o 29.00' East 54o 19.00' North|
|IBA criteria||C2, C3, C4, C6|
|Year of IBA assessment||2010|
Ornithological information The site regularly supports 20,000 or more waterbirds, mainly wildfowl Anser/Anas. Breeding species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (at least one pair), Crex crex (4-10 pairs). The most important parts of the site for birds in general are Elbl¹g Bay and the Pas³êka mouth. Non-breeding birds occur mainly in the coastal zone, from Przebrno village to the Pas³êka mouth.
Site description The site comprises the Polish part of this large, shallow coastal lagoon (up to 5 m deep) of brackish water, which is cut off from the Baltic Sea by the Wila spit. A narrow channel in the Russian part of the lagoon, through which sea water flows during heavy storms, joins the water-body with the Baltic Sea (Gulf of Gdañsk). There is some river flow to the Polish part of the lagoon from the west, comprising a few branches of the Wis³a (Vistula) river deriving from the uplands. The water-level fluctuates significantly on a daily basis (by up to 1.5 m) because of wind effects. There are extensive reedbeds (Phragmites) along the shore, forming one or two belts up to 100 m wide, as well as rich floating and submerged vegetation (Nymphaea, Potamogeton) which supports a very rich invertebrate and fish fauna. Land-uses include intensive reed-harvesting (`Other').
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Greater White-fronted Goose Anser albifrons||passage||2006||15,600 individuals||good||C3||Least Concern|
|Mute Swan Cygnus olor||passage||1995-2003||1,800-3,500 individuals||-||C3||Least Concern|
|Smew Mergellus albellus||passage||2006-2009||500-2,000 individuals||poor||C2||Least Concern|
|Great Cormorant Phalacrocorax carbo||breeding||2009||8,918-10,226 breeding pairs||good||C3||Least Concern|
|White-tailed Eagle Haliaeetus albicilla||breeding||2006-2009||8-10 breeding pairs||good||C6||Least Concern|
|Spotted Crake Porzana porzana||breeding||1995-2003||20-100 males only||-||C6||Least Concern|
|Little Gull Larus minutus||passage||2006-2009||400-5,500 individuals||poor||C2||Least Concern|
|Black Tern Chlidonias niger||breeding||2006-2009||80-160 breeding pairs||good||C6||Least Concern|
|A4iii Species group - waterbirds||passage||2006-2008||22,000-26,000 individuals||good||C4|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Dolina Pasteki - PLB280002||Birds Directive||20,670||protected area is adjacent to site||0|
|Zalew Wislany - PLB280010||Birds Directive||32,224||protected area contained by site||32,224|
|Zalew Wislany i Mierzeja Wislana - PLH280007||Habitats Directive||40,863||protected area contains site||33,632|
|Zatoka Elblaska||Nature Reserve||420||protected area contained by site||420|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Water fringe vegetation||-|
|Land-use||Extent (% of site)|
Management considerations Heavy nutrient pollution from agriculture, industry and domestic sewage is a threat. Birds become trapped in fish-nets. The changes in water-level affect breeding birds. Intensive reed-harvesting is also a problem (`Other'). The entire IBA lies within the buffer zones of two Landscape Parks (Mierzeja Wilana, 22,390 ha; Wzniesienie Elbl¹skie, 48,591 ha), approximately equally divided between the two.
Protection status National Low International None420 ha of IBA covered by Nature Reserve (Zatoka Elbl¹ska, 420 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Vistula Lagoon. Downloaded from http://www.birdlife.org on 20/06/2013
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