Porvoo outer archipelago

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
Caspian Tern Hydroprogne caspia LC breeding 1997 53 breeding pairs A4i, B1i, B2, C2, C6
Black Guillemot Cepphus grylle LC breeding 1997 224-229 breeding pairs B1ii, B2

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 medium favourable medium
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Invasive and other problematic species and genes invasive non-native/alien species/diseases - unspecified species happening now some of area/population (10-49%) no or imperceptible deterioration low

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Hydroprogne caspia Caspian Tern 80 80 breeding pairs 100 favourable
Cepphus grylle Black Guillemot 225 225 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) No management plan exists but the management planning process has begun The conservation measures needed for the site are being comprehensively and effectively implemented medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
TUNNHOLMENIN LUONNONSUOJE Yksityinen luonnonsuojelualue 27 protected area overlaps with site 0
STOR-PELLINGE YTTRE HÄLLARNATURSKYDDSOMRÅDE Yksityinen luonnonsuojelualue 1,993 protected area overlaps with site 0
SÖDERSKÄRIN LUONNONSUOJEL Yksityinen luonnonsuojelualue 2,103 protected area contained by site 2,134
Söderskärin ja Långörenin saaristo /Söderskär and Långören Archipelago Baltic Sea Protected Area (HELCOM) 18,219 protected area overlaps with site 0
Söderskärin ja Långörenin saaristo Site of Community Importance (Habitats Directive) 18,219 protected area overlaps with site 0
Söderskärin ja Långörenin saaristo Special Protection Area (Birds Directive) 18,219 protected area overlaps with site 13,016
Söderskär and Långören Archipelago Ramsar Site, Wetland of International Importance 18,219 protected area overlaps with site 11,522
Sandkallanin-Stora Kölhällenin hylkeidensuojelualue Hylkeidensuojelualue 7,536 protected area overlaps with site 0
Långörenin saariryhmän luonnonsuojelualue Valtion luonnonsuojelualue 50 protected area contained by site 8,338


IUCN Habitat Habitat detail Extent (% of site)
Forest -
Marine Neritic -
Coastline -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
unknown -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Porvoo outer archipelago. Downloaded from on 29/11/2022.