Data Zone
The site was identified as important in 2010 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.
Populations meeting IBA criteria ('trigger species'):| Species | Current IUCN Red List Category | Season | Year(s) | Population estimate at site | IBA criteria met |
|---|---|---|---|---|---|
| Common Goldeneye Bucephala clangula | LC | winter | 2004-2009 | 1,500-22,700 individuals | C3 |
| Goosander Mergus merganser | LC | winter | 2004-2009 | 400-6,500 individuals | C3 |
| Horned Grebe Podiceps auritus | VU | passage | 2004-2009 | 10-300 individuals | C2 |
| Eurasian Curlew Numenius arquata | NT | passage | 2007-2009 | 100 individuals | C1 |
| Little Gull Hydrocoloeus minutus | LC | passage | 2007-2009 | 1,500-5,000 individuals | C2 |
| Little Tern Sternula albifrons | LC | breeding | 2007-2009 | 40-50 breeding pairs | C6 |
| Common Tern Sterna hirundo | LC | breeding | 2007-2009 | 300-360 breeding pairs | C6 |
| Sandwich Tern Thalasseus sandvicensis | LC | passage | 2007-2009 | 2,000 individuals | C2 |
| Sandwich Tern Thalasseus sandvicensis | LC | breeding | 2007-2009 | 300-570 breeding pairs | C2, C6 |
| A4iii Species group - waterbirds | n/a | winter | 2004-2009 | 31,700 individuals | C4 |
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2010).
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment (most recent) | State (condition) | Pressure (threat) | Response (action) |
| 2010 | very unfavourable | very high | low |
| Was the whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | medium | |
| State (condition of the trigger species' populations) | ||||||
|---|---|---|---|---|---|---|
| Scientific name | Common name | Reference population | Actual population | Units | % of population remaining | Result |
| Sternula albifrons | Little Tern | 45 | 15 | breeding pairs | 34 | very unfavourable |
| Sterna hirundo | Common Tern | 160 | 50 | breeding pairs | 32 | very unfavourable |
| Thalasseus sandvicensis | Sandwich Tern | 190 | 100 | breeding pairs | 53 | unfavourable |
| Pressure (threats to the trigger species and/or their habitats) | |||||
|---|---|---|---|---|---|
| Threat level 1 | Threat level 2 | Timing | Scope | Severity | Result |
| Agricultural expansion and intensification | marine and freshwater aquaculture - subsistence/artisinal aquaculture | happening now | majority/most of area/population (50-90%) | slow but significant deterioration | high |
| Biological resource use | fishing & harvesting aquatic resources - unintentional effects: large scale | happening now | majority/most of area/population (50-90%) | moderate to rapid deterioration | high |
| Biological resource use | hunting & collecting terrestrial animals - intentional use (species being assessed is the target) | happening now | whole area/population (>90%) | very rapid to severe deterioration | very high |
| Climate change and severe weather | storms and floods | happening now | whole area/population (>90%) | very rapid to severe deterioration | very high |
| Climate change and severe weather | temperature extremes | happening now | whole area/population (>90%) | very rapid to severe deterioration | very high |
| Human intrusions and disturbance | recreational activities | happening now | whole area/population (>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 | majority/most of area/population (50-90%) | moderate to rapid deterioration | high |
| Invasive and other problematic species and genes | problematic native species/diseases - unspecified species | happening now | majority/most of area/population (50-90%) | moderate to rapid deterioration | high |
| No known threats | no known threats | happening now | small area/few individuals (<10%) | no or imperceptible deterioration | low |
| Pollution | domestic & urban waste water - type unknown/unrecorded | happening now | whole area/population (>90%) | slow but significant deterioration | high |
| Pollution | garbage & solid waste | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Pollution | industrial & military effluents - type unknown/unrecorded | happening now | some of area/population (10-49%) | no or imperceptible deterioration | low |
| Residential and commercial development | tourism and recreation areas | likely in long term (beyond 4 years) | some of area/population (10-49%) | slow but significant deterioration | medium |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Protected-area designation | Management planning | Other conservation action | Result |
| Some of site covered (10-49%) | No management plan exists but the management planning process has begun | Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity | low |
| Protected area (PA) | PA designation | PA area (ha) | Relationship of PA with IBA | Overlap of PA with IBA (ha) |
|---|---|---|---|---|
| Żuław Gdańskich | Obszar Chronionego Krajobrazu | 31,700 | protected area overlaps with site | 0 |
| Wyspy Sobieszewskiej | Obszar Chronionego Krajobrazu | 1,393 | protected area overlaps with site | 0 |
| Vistula river mouth | Baltic Sea Protected Area (Helcom) | 1,747 | protected area contains site | 642 |
| Vistula River Mouth | Ramsar Site, Wetland of International Importance | 1,748 | protected area overlaps with site | 0 |
| Ujście Wisły | Special Protection Area (Birds Directive) | 1,748 | protected area overlaps with site | 642 |
| Ujscie Wisly | Baltic Sea Protected Area (HELCOM) | 1,751 | protected area overlaps with site | 0 |
| Środkowożuławski | Obszar Chronionego Krajobrazu | 3,024 | protected area overlaps with site | 0 |
| Ostoja w Ujściu Wisły | Site of Community Importance (Habitats Directive) | 884 | protected area overlaps with site | 446 |
| Mewia Łacha | Rezerwat Przyrody | 155 | protected area overlaps with site | 150 |
| Mewia Lacha (acha) | Nature Reserve | 150 | unknown | 150 |
| Habitat (IUCN level 1) | Habitat detail | Extent (% of site) |
|---|---|---|
| Forest | Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland, Alluvial and very wet forest | - |
| Shrubland | Scrub | - |
| Grassland | Steppes and dry calcareous grassland, Humid grasslands | - |
| Marine Coastal/Supratidal | - | |
| Marine Intertidal | - |
| Land-use | Extent (% of site) |
|---|---|
| fisheries/aquaculture | - |
| forestry | - |
| tourism/recreation | - |
| agriculture | - |
| nature conservation and research | - |
| hunting | - |
Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Vistula river mouth. Downloaded from
http://datazone.birdlife.org/site/factsheet/vistula-river-mouth-iba-poland on 05/10/2023.
