Porvoonjoki Delta

IBA Criteria

Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Whooper Swan Cygnus cygnus LC passage 1996 400-500 individuals B1i, C2
Smew Mergellus albellus LC passage 1996 200-250 individuals A4i, B1i, C2
Goosander Mergus merganser LC passage 1996 3,000-3,500 individuals A4i, B1i, C3
Common Reed-warbler Acrocephalus scirpaceus LC breeding 1996 90-130 breeding pairs B3

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)
2010 high very unfavourable medium
Was the whole site covered? Yes State assessed by Population
Accuracy of information medium

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Pollution agricultural & forestry effluents - nutrient loads happening now majority/most of area/population (50-90%) moderate to rapid deterioration high

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Cygnus cygnus Whooper Swan 200 200 individuals 100 favourable
Mergellus albellus Smew 200 130 individuals 65 unfavourable
Mergus merganser Goosander 3000 400 individuals 14 very unfavourable
Acrocephalus scirpaceus Common Reed-warbler 90 90 breeding pairs 100 favourable

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)
STENSBÖLEN LUONNONSUOJELU Yksityinen luonnonsuojelualue 60 protected area overlaps with site 0
STENSBÖLEN LUONNONSUOJELU Yksityinen luonnonsuojelualue 21 protected area overlaps with site 0
STENSBÖLEFJÄRDENIN LUONNO Yksityinen luonnonsuojelualue 277 protected area overlaps with site 0
STENSBÖLE 3 (LUONNONSUOJE Yksityinen luonnonsuojelualue 140 protected area is adjacent to site 0
Sikosaaren metsä Yksityinen luonnonsuojelualue 35 protected area overlaps with site 0
SIKOSAAREN LUONNONSUOJELU Yksityinen luonnonsuojelualue 18 protected area overlaps with site 0
RUSKIKSEN LUONNONSUOJELUA Yksityinen luonnonsuojelualue 196 protected area overlaps with site 226
Porvoonjoki Estuary - Stensböle Ramsar Site, Wetland of International Importance 958 protected area overlaps with site 899
Porvoonjoki Delta Baltic Sea Protected Area (Helcom) 1,326 protected area overlaps with site 764
Porvoonjoen suisto-Stensböle Special Protection Area (Birds Directive) 1,331 protected area overlaps with site 706
Porvoonjoen suisto-Stensböle Site of Community Importance (Habitats Directive) 1,331 protected area overlaps with site 0
Porvoonjoen suisto - Stensböle /Porvoonjoki estuary-Stensböle Baltic Sea Protected Area (HELCOM) 1,331 protected area overlaps with site 0
Kaupunginselkä-Stensbölefjärden Yksityinen luonnonsuojelualue 243 protected area overlaps with site 0
EKUDDENIN LEHDON LUONNONS Yksityinen luonnonsuojelualue 17 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Grassland Alpine, subalpine and boreal grassland -
Coastline Lagoons -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
urban/industrial/transport -
not utilised -
tourism/recreation -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Porvoonjoki Delta. Downloaded from on 08/12/2022.