Data Zone
The site was identified as internationally important for bird conservation in 2015 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.
Populations meeting IBA criteria ('trigger species') at the site:| Species | Red List | Season (year/s of estimate) | Size | IBA criteria |
|---|---|---|---|---|
| Long-tailed Duck Clangula hyemalis | VU | passage (1989–2014) | 12,092–30,000 birds | B1i, C3 |
| Common Eider Somateria mollissima | NT | passage (2014) | min 32,500 birds | A4i, B1i, C3 |
| A4iii Species group - waterbirds | n/a | passage (1996) | 41,000 birds | A4iii, C4 |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2015. The most recent assessment (2010) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2010 | poor | medium | low |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | medium | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Common Eider Somateria mollissima | 18,000 / 30,000 (birds) | 60 | poor | ||
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Pollution | happening now | few individuals/small area (<10%) | slow decline (1–10% over 3 generations) | low |
| Transportation and service corridors | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Human intrusions and disturbance | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Some of area covered (10–49%) | No management plan exists, but the management planning process has begun | Some limited conservation initiatives are in place | low |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| - | Hanko western archipelago | Baltic Sea Protected Area (Helcom) (UA) | 47 |
| 1933 | TULLINIEMEN LUONNONSUOJEL | Yksityinen luonnonsuojelualue (IV) | 21 |
| 1982 | Saaristomeren kansallispuisto | Kansallispuisto (II) | 25 |
| 1989 | Uddskatanin luonnonsuojelualue | Valtion luonnonsuojelualue (IV) | <1 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Marine Neritic | 80 | |
| Marine Coastal/Supratidal | minor (<10) |
| Land use | % of IBA |
|---|---|
| urban/industrial/transport | 70 |
| tourism/recreation | 50 |
| unknown | 50 |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Hanko western archipelago (Finland). Downloaded from
https://datazone.birdlife.org/site/factsheet/hanko-western-archipelago-iba-finland on 25/12/2024.