Øvre Heimdalsvatn, Radiocaesium (Cs-137) monitored annually in brown trout (Salmo trutta)

Latest version published by University of Oslo on Dec 8, 2021 University of Oslo
Publication date:
8 December 2021
Published by:
University of Oslo
CC-BY 4.0

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"This dataset describes a long time serie for monitoring of radioactive radiocaesium isotope (Cs-137) concentration in the brown trout (Salmo trutta) population in a mountain lake (Øvre Heimdalsvatn) situated on the tree line in the eastern edge of the Jotunheimen Mountains. Ecosystem studies at Øvre Heimdalsvatn started in 1957, while this time series for radioecological monitoring started after the Chernobyl nuclear power plant accident in 1986. The aim of this study was to document the long-term changes in the radioactive isotope Cs-137 in brown trout and to elucidate the factors determining changes in Cs-137 activity concentrations over time. This dataset provides only one time serie from the extensive ecosystem studies (initiated in 1957) at Øvre Heimdalsvatn. The mountain lake is at 1090 meter above sea-level with a surface area of 0.78 square kilometer (km2) (78 hectare). The maximum length is 3 km and the maximum width is 396 m. The largest depth is 13 m and the average depth is 4.7 m. Vegetation near the lake ranges from subalpine birch forest with areas of mountain pasture to high alpine vegetation above 1,600 m a.s.l. Originally brown trout was the sole fish species in the lake, but since 1969 the European minnow (Phoxinus phoxinus) has also been recorded and its numbers have subsequently increased substantially. Brown trout for this study were generally caught by gill netting around the lake."

Data Records

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The publisher and rights holder of this work is University of Oslo. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 7221810e-52b1-459d-a6a4-02160c67feef.  University of Oslo publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Norway.


Occurrence; Specimen; Occurrence


John Edward Brittain
  • Originator
  • Point Of Contact
Natural History Museum, University of Oslo
Sars gate 1
0562 Oslo
Sars gate 1
0562 Oslo
Jan Egil Gjerseth
  • Content Provider
Campus Ås
1430 Ås
Reidar Borgstrøm
  • Content Provider
Campus Ås
1430 Ås
John Gunnar Dokk
  • Content Provider
Campus Ås
1430 Ås

Geographic Coverage

Øvre Heimdalsvatn, Norway

Bounding Coordinates South West [61.417, 8.84], North East [61.428, 8.895]

Temporal Coverage

Start Date / End Date 1986-08-04 / 2007-09-19

Project Data

No Description available

Title Øvre Heimdalsvatn
Study Area Description Monitoring of lake ecosystem, including brown trout stocks and interaction with European minnow, benthic macroinvertebrates, zooplankton and radiocesium in water, fish, aquatic moss, allochthonous organic matter and lake sediments. Abiotic parameters, including lake water level, water temperature, ice cover duration, precipitation and air temperature, are also continuously measured. In addition, there extensive studies of bird behaviour in the catchment, as well as monitoring of small mammals.

The personnel involved in the project:


Additional Metadata

Alternative Identifiers 7221810e-52b1-459d-a6a4-02160c67feef