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Location Sweden, Stockholm
Central coordinates 19o 9.58' East  59o 23.82' North
IBA criteria A4i, A4ii, A4iii, B1i, B1ii, B2, B3, C2, C3, C4, C6
Area 159,000 ha
Altitude 0 - 10m
Year of IBA assessment 2000

Sveriges Ornitologiska Förening



Site description The main area of interest can be divided into four island groups: Stora Nassa˜c.400 closely spaced rocky islets with little or no vegetation. The largest island has maritime Betula forest whilst others support Juniperus. Wet grasslands are also present. Lilla Nassa˜smaller area than Stora Nassa but with islands more spread out and with very little vegetation. Gillöga˜flat islands in shallow waters with abundant cover and submerged offshore reefs. Svenska Högarna˜a flat island with Juniperus, and heather Calluna. The archipelago is largely uninhabited but during the summer is a popular leisure (boating) area.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima breeding  1996  36,500-36,700 breeding pairs  medium  A4i, B1i, C3  Least Concern 
Common Eider Somateria mollissima non-breeding  1996  20,000-40,000 individuals  poor  A4i, B1i, C3  Least Concern 
Melanitta fusca breeding  1996  3,850-4,190 breeding pairs  medium  A4i, B1i, C3  Not Recognised 
Red-breasted Merganser Mergus serrator breeding  1996  590-615 breeding pairs  medium  B1i, C3  Least Concern 
Goosander Mergus merganser breeding  1996  640-660 breeding pairs  medium  A4i, B1i, C3  Least Concern 
Common Redshank Tringa totanus breeding  1996  355-370 breeding pairs  medium  B2  Least Concern 
Ruddy Turnstone Arenaria interpres breeding  1996  790-840 breeding pairs  medium  A4i, B1i, C3  Least Concern 
Mew Gull Larus canus breeding  1996  4,500-5,000 breeding pairs  medium  B2  Least Concern 
Great Black-backed Gull Larus marinus breeding  1996  460-480 breeding pairs  medium  B3  Least Concern 
Lesser Black-backed Gull Larus fuscus breeding  1996  950-1,300 breeding pairs  medium  B1i, B3, C3  Least Concern 
Caspian Tern Hydroprogne caspia breeding  1996  100-250 breeding pairs  medium  A4i, B1i, B2, C2, C6  Least Concern 
Arctic Tern Sterna paradisaea breeding  1996  2,490 breeding pairs  poor  C2  Least Concern 
Arctic Jaeger Stercorarius parasiticus breeding  1996  175-200 breeding pairs  medium  B1ii, C3  Least Concern 
Common Murre Uria aalge breeding  1996  200-400 breeding pairs  medium  B1ii, C3  Least Concern 
Razorbill Alca torda breeding  1996  1,400-2,000 breeding pairs  medium  B1ii, B3, C3  Least Concern 
Black Guillemot Cepphus grylle breeding  1996  4,000-4,400 breeding pairs  medium  A4ii, B1ii, B2  Least Concern 
A4iii Species group - waterbirds breeding  1996  20,000-49,999 breeding pairs  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ängsö/Marskär Wildlife and Plant Sanctuary 200 protected area contained by site 200  
Biskopsö Nature Reserve 5,122 protected area overlaps with site 4,000  
Bullerö Nature Reserve 4,437 protected area overlaps with site 4,100  
Bullerö-Bytta - SE0110088 Habitats Directive 14,314 protected area contained by site 14,314  
Fjärdlång Nature Reserve 5,089 protected area overlaps with site 2,000  
Fjärdlång - SE0110086 Habitats Directive 5,089 protected area overlaps with site 3,635  
Gjusharan Wildlife and Plant Sanctuary 23 protected area contained by site 22  
Grän Wildlife and Plant Sanctuary 30 protected area contained by site 28  
Grönskär Nature Reserve 2 protected area contained by site 2  
Huvudskär Nature Reserve 2,076 protected area overlaps with site 0  
Huvudskär - SE0110111 Habitats Directive 2,076 protected area contained by site 2,076  
Långskär Nature Reserve 854 protected area contained by site 875  
Långviksskär Nature Reserve 3,897 protected area contained by site 2,300  
Lygne Wildlife and Plant Sanctuary 144 protected area contained by site 130  
Norrpada Nature Reserve 36 protected area contained by site 36  
Norrpada - SE0110140 Habitats Directive 32 protected area contained by site 32  
Outer Stockholm archipelago Baltic Sea Protected Area (Helcom) 14,336 protected area overlaps with site 13,763  
Outer Stockholm archipelago Baltic Sea Protected Area (Helcom) 29,735 protected area overlaps with site 28,695  
Outer Stockholm archipelago Bird Sanctuary 0 protected area overlaps with site 0  
Rörskären Wildlife and Plant Sanctuary 35 protected area contained by site 38  
Stockholm, outer archipelago Wetlands of International Importance (Ramsar) 15,000 protected area contained by site 15,000  
Stora Nassa Nature Reserve 2,942 protected area contained by site 3,000  
Stora Nassa Wildlife and Plant Sanctuary 440 protected area contained by site 440  
Stora Nassa - SE0110092 Birds Directive 2,949 protected area contained by site 2,949  
Storö-Bockö-Lökaö Nature Reserve 6,047 protected area overlaps with site 2,660  
Sundby Nature Reserve 5,174 protected area overlaps with site 290  
Svenska Björn Nature Conservation Area 3,980 protected area overlaps with site 3,970  
Svenska Björn - SE0110124 Habitats Directive 3,980 protected area contained by site 3,980  
Svenska Högarna Nature Reserve 2,667 protected area contained by site 2,600  
Svenska Högarna - SE0110096 Birds Directive 2,667 protected area contained by site 2,667  
Torrmulen Wildlife and Plant Sanctuary 10 protected area contained by site 7  
Utö Nature Reserve 4,174 protected area overlaps with site 270  
Utö - SE0110085 Habitats Directive 4,182 protected area overlaps with site 267  
Vidingsöra Nature Reserve 21 protected area contained by site 21  
Viksharorna Wildlife and Plant Sanctuary 22 protected area contained by site 21  
Villinge Boskapsö Nature Reserve 340 protected area overlaps with site 280  
Villinge Boskapsö - SE0110087 Habitats Directive 340 protected area overlaps with site 271  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland  5%
Grassland Dry siliceous grassland  5%
Sea Open Sea; Sea inlets and coastal features  90%
Coastline Rock stacks and islets  -

Land use

Land-use Extent (% of site)
hunting 50%
military 5%
nature conservation and research 10%
tourism/recreation 50%

Protection status National Partial International HighIBA overlaps with Nature Reserve (3,400 ha); large areas are also designated as Bird Sanctuaries. 9,100 ha of IBA covered by Ramsar Site (Stockholm, outer archipelago, 15,000 ha). IBA overlaps with Special Protection Area.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Outer Stockholm archipelago. Downloaded from http://www.birdlife.org on 29/08/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife