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close| Location | Finland, Etelä-Suomen lääni |
| Central coordinates | 25o 40.00' East 60o 21.00' North |
| IBA criteria | A4i, B1i, B3, C2, C3 |
| Area | 899 ha |
| Altitude | |
| Year of IBA assessment | 2000 |
Ornithological information One of the most important breeding and staging areas for waterbirds in the country. Probably the best single congregatory area in spring in Finland for Mergus merganser and M. albellus. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (max. 2 individuals, passage), Crex crex (max. 3 pairs, breeding).
Site description A large, richly vegetated delta of the Porvoo river, with few small meadows along the shores. At the heart of the site is a largish, shallow area of open water (Stenbölefjärden) bordered by belts of Phragmites.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Whooper Swan Cygnus cygnus | passage | 1996 | 400-500 individuals | good | B1i, C2 | Least Concern |
| Smew Mergellus albellus | passage | 1996 | 200-250 individuals | good | A4i, B1i, C2 | Least Concern |
| Common Merganser Mergus merganser | passage | 1996 | 3,000-3,500 individuals | good | A4i, B1i, C3 | Least Concern |
| Eurasian Reed-warbler Acrocephalus scirpaceus | breeding | 1996 | 90-130 breeding pairs | poor | B3 | Least Concern |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Porvoonjoen suisto-Stensböle - FI0100074 | Birds Directive | 1,331 | protected area overlaps with site | 706 | |
| Porvoonjoki Estuary - Stensböle | Wetlands of International Importance (Ramsar) | 1,330 | protected area contains site | 899 |
|
| Ruskiksen luonnonsuojelualue | Private Nature Reserve | 196 | protected area contained by site | 226 |
|
| Stensbölefjärdenin luonnonsuojelualue | Private Nature Reserve | 277 | unknown | 0 |
|
| Stensbölen luonnonsuojelualue 1 | Private Nature Reserve | 60 | unknown | 0 |
|
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Grassland | Alpine, subalpine and boreal grassland | 5% |
| Coastline | Lagoons | 95% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| urban/industrial/transport | 20% |
| not utilised | 10% |
| tourism/recreation | 70% |
Management considerations Human impact is considerable in most of the area, with many parts bordered by settlements, while boating and fishing disturbs avifauna in the interior of the site. Overgrowth of the wetland is also a threat. Hunting is permitted throughout the area, except the northernmost part (Ruskis) which remains a sanctuary for staging waterbirds in autumn. A large EU LIFE project has been started in the area. A birdwatching tower is situated at Ruskis, on the mouth of the Porvoo river. Part of the area is a candidate SAC.
Protection status National Partial International Partial446 ha of IBA covered by Protected Area on Private Lands (Ruskis, 226 ha, Stensböle, 85 ha, Stenbölefjärden, 273 ha). 235 ha of IBA covered by Ramsar Site (Ruskis, 235 ha). 764 ha of IBA covered by Special Protection Area (Porvoonjoen suisto-Stensböle).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Porvoonjoki Delta. Downloaded from http://www.birdlife.org on 19/06/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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