EU network of mesocosms facilities for research on marine and freshwater ecosystems open for global collaboration.

SITES AquaNet – Erken Laboratory


The mesocosm facility does not open for Transnational Access (TA) in 2021.

For new TA opportunities please go to AQUACOSM-plus.

Legal name of organisation (short name)
Uppsala University
Organisation address

Uppsala University:

P.O. Box 256

SE-751 05 Uppsala



Erken Laboratory:

Norra Malmavägen

761 73 Norrtälje


Infrastructure (short name)
SITES AquaNet - Erken Laboratory
Infrastructure address

SITES AquaNet – Erken Laboratory

Erken Laboratory:
Norra Malmavägen
761 73 Norrtälje

Coordinates / (routes, areas if non-static)
Facility location(s)
Description of the Infrastructure
Primary contact information (PI)

Silke Langenheder:

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Years of Mesocosm Experiments
2017 - present
Description of Facility
  • Open access to national and international researchers.
  • Outdoor, freshwater, lake deployed in an adaptable jetfloat.
  • PE-film enclosures or 20 hard-shell PE enclosures (ø = 0.9m, depth = 1.5m, volume = 700L).
  • In addition, there is access to another set of 20 hard-shell PE enclosures (ø = 1m, depth = 2 m, volume = 1200L).
Controlled Parameters
Research Topics

Advance general understanding in ecology by using modularized experiments across SITES-AquaNet stations (Sweden) or potential collaborators (Sweden, Europe and other continents). Topics: biodiversity-functioning-stability relationships, community ecology, ecological stoichiometry, food web interactions, benthic-pelagic dynamics, biochemistry (carbon cycling), cyanobacterial blooms and global change research. Possibility to combine mechanistic experiments with historical (decadal) lake monitoring data from Lake Erken (e.g., phytoplankton, zooplankton, fish, nutrients and high frequency temperature measurements).

Primary interests
Specialist areas
Source of Information

SITES AquaNet, Water and Spectral:



Photos of experiments/installations
Photo credit: Sophie Wertek
Infrastructure (short name)
SITES AquaNet - Erken Laboratory
Modality of access

Modality of access under AQUACOSM-plus: A total of 1600 person-days will be allocated to external users supported by an AQUACOSM-plus TA activity in year 3. At least 1600 person-days will be allocated to external users of AQUACOSM-plus TA provision. It is anticipated that AQUACOSM-plus will support a minimum of 5-6 persons for 57-60 days per year in M22-33. A typical experiment is expected to run for 6-8 weeks (excluding preparations). TA access is however recommended for longer stays for 3-5 users per station. The primary objective for access will be the implementation a coordinated experiment in all 5 lakes that addresses a grand scientific challenge as defined in Task 6.1. TA users will have the opportunity to be part of this synchronised experiment, which includes planning, on-site preparation, and implementation of experiments at the different field stations. One of the nodes (the Erken Laboratory) can also host participants during the sample analysis period after the experiment and can offer access to laboratories, instrumentation and the scientific environment at the Department of Ecology and Genetics at Uppsala University as well. The access costs are estimated based on real cost calculations.

Unit of access


What service and support facilities are available

Services currently offered by the infrastructure: External users have open access to equipment to run mesocosm experiments in one or more lakes spread across a geographical and climatic gradient in Sweden. This includes sensor calibrations and installations, support with installing and uninstalling of mesocosms, online-visualisation of sensor data, access to sensor data and lab space, equipment for sampling and sample preparation and sampling protocols. Data from lake and time series data is also available through SITES Water (coordinated by Skogaryd and Svartberget) comprising a multi-layered lake and stream monitoring program including hydrological, physical, chemical and biological parameters as well as GHG and C fluxes. Additional technical and analytical support by experienced staff is available when costs are covered, including the possibility for water analyses in accredited laboratories. The infrastructure was established in 2017 and has so far been used for experiments that manipulated fish predation, light, salinisation and browning. In addition, one station (Erken Laboratory) can also provide 20 1500 L polyethylene enclosures. Activities at the different stations include a large variety of long-term monitoring programs and research projects within the field of ecosystem science, which gives users the possibility to interact with technical staff and researchers working at the stations.

Support offered under AQUACOSM-plus: TA users will have full access to the mesocosm infrastructure and services described above, as well as training by technical staff in sampling procedures and use of equipment and instruments. Standard disposables as well as administrative and logistic support (cars and boats).


Capacity in site (Erken Laboratory) up to 60 people with fridges, freezers and cooking facilities (

Special rules