Tvärminne Mesocosm Facility (TMF)

Tvärminne Mesocosm Facility (TMF)
Legal name of organisation
University of Helsinki
Organisation address

University of Helsinki
P.O. Box 3
00014 University of Helsinki

Primary contact information (PI)

Director: Marko Reinikainen
Research Coordinator: Joanna Norkko

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Years of Mesocosm Experiments
Established 1902; Large field mesocosms run periodically since 1988
Description of Facility

pelagic – marine – outdoor

A large nature reserve surrounding TZS is dedicated to research, providing access to a pristine environment for field mesocosms. Research vessels and technical services support sampling and maintenance; a hovercraft allows winter-studies. Aquarium facilities with natural or artificial light are available for flow-through experiments at up to 100 000 m3 daily water capacity. A marine laboratory provides analytical services.

Controlled Parameters

Temperature, light, pH, pCO2, nutrient levels, community composition, turbidity

Research Topics

Biodiversity, stoichiometry, benthic ecology, plankton ecology, seagrass ecology, ice studies, reproductive evolution in fishes

Facility location(s)
Primary interests
Specialist areas

Wet labs, outdoor aquarium facility, climatic chambers, bio-optical instrumentation (spectrophotometry, spectrofluorometry), masspectrometry, carbon analyzers, microscopes with digital imaging, isotope lab, chemistry lab, CTD, meters for light, turbidity and oxygen, field sampling equipment, research vessels, hovercraft


Dormitories with ca 100 beds, full board, self-service kitchens, sea-side sauna

Photos of experiments/installations
Pristine nature reserve for experimental set-ups
SYKE-MRC field mesocosm work at Tvärminne