Archipelago Research Institute (ARI) belongs to the Biodiversity Unit of the University of Turku (UTU). ARI is located on an island in the middle region of the northern Baltic Archipelago Sea. The Institute participates in multidisciplinary research of the Baltic Sea, with a special focus on the Archipelago Sea. Since its foundation in 1964, ARI has conducted long-term environmental monitoring and offers various research services for researchers, students and course participants. Research at ARI comprises of projects studying, for example, the biological and geological condition of the Archipelago Sea, and the island's historical background as a hospital island for people suffering from leprosy and mental illnesses. ARI provides TA services for ASSEMBLE Plus, for which the University of Helsinki (UH) is the Finnish partner.


  • Baltic Sea ecosystems (brackish water ecosystems characterised by vast archipelagos with high habitat complexity)


Ecosystem access

  • Research vessel R/V Aurelia (18.1 m), suitable for entering shallow coastal areas
  • Five smaller boats such as Seili 5 (10.5 m) and Seili 1 (8.05 m)
  • Ski-doo
  • Ice skimmer


Experimental facilities and technology platforms

  • Seawater laboratory
  • Marine experimental ecology infrastructure with flow-through aquaria and indoor and outdoor mesocosm facilities
  • Standard sampling and laboratory equipment for marine research (e.g. water samplers, plankton nets, microscopes, sediment corers and grabs, CTD and side scan sonar)
  • Seawater (6 PSU) is supplied to the laboratories via pipes


Associated services

  • Long-term monitoring data from the area on weather, seawater temperature, salinity, oxygen, pH, nutrients, chlorophyll, zooplankton, phytoplankton and herring
  • Zooplankton monitoring samples since 1966, with corresponding temperature and salinity data

The station is operational all year around. Accommodation and restaurant services at Seili are available through a travel company Skärgårdskompaniet Oy Ab. ARI also offers cabin accommodation for small research groups in the neighboring islands.


Archipelago Research Institute
20014 Turun yliopisto
Liaison officer: Jari Hänninen (, cc to:

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