Data Zone
The site was identified as internationally important for bird conservation in 2000 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 |
|---|---|---|---|---|
| Red-breasted Merganser Mergus serrator | LC | breeding (1992) | 101–500 pairs | B1i, C3 |
| Common Redshank Tringa totanus | LC | breeding (1992) | 101–500 pairs | B1i, B2, C3 |
| Mew Gull Larus canus | LC | breeding (1992) | 501–1,000 pairs | B2 |
| Lesser Black-backed Gull Larus fuscus | LC | breeding (1997) | 160–170 pairs | B3 |
| Black Guillemot Cepphus grylle | LC | breeding (1997) | 110 pairs | B2 |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2010) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2010 | good | 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 | ||
| Red-breasted Merganser Mergus serrator | 350 / 350 (pairs) | 100 | good | ||
| Common Redshank Tringa totanus | 95 / 100 (pairs) | 95 | good | ||
| Mew Gull Larus canus | 2,800 / 1,000 (pairs) | 100 | good | ||
| Lesser Black-backed Gull Larus fuscus | 200 / 160 (pairs) | 100 | good | ||
| Black Guillemot Cepphus grylle | 130 / 110 (pairs) | 100 | good | ||
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Invasive and other problematic species and genes | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Pollution | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Most of area (50–90%) covered (including the most critical parts for important bird species) | A management plan exists, but it is out of date or not comprehensive | Very little or no conservation action taking place | low |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 2002 | Rahjan saaristo 11 (Yhteinen vesialue) | Yksityinen luonnonsuojelualue (IV) | 14 |
| 2002 | Rahjan saaristo 15 | Private Nature Reserve (IV) | <1 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Marine Coastal/Supratidal | 40 | |
| Forest | 30 | Native coniferous woodland; Mixed woodland |
| Marine Neritic | 30 | |
| Marine Intertidal | - |
| Land use | % of IBA |
|---|---|
| tourism/recreation | 60 |
| hunting | 40 |
| forestry | 10 |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Rahja archipelago (Finland). Downloaded from
https://datazone.birdlife.org/site/factsheet/rahja-archipelago-iba-finland on 22/12/2024.