ExStream System Germany

ExStream System Germany
Legal name of organisation
University of Duisburg-Essen, Aquatic Ecosystem Research
Organisation address

University of Duisburg-Essen, Aquatic Ecosystem Research

Universitaetsstrasse 5

D-45141 Essen


Primary contact information (PI)

Prof. Florian Leese

ExStream network coordinator Asst. Prof. Jeremy J. Piggott




Years of Mesocosm Experiments
2013 - present
Description of Facility

The ExStream System comprises 128 circular stream mesocosms offering strict control of experimental variables, excellent statistical power and a high degree of realism, such as permitting natural immigration and emigration of stream organisms (invertebrates, algae and microbes) and achieving the same ambient temperature, light conditions and water chemistry as the adjoining river/stream. The mesocosms are arranged in eight blocks of 16 units each, and each of these blocks is continuously supplied by stream water gravity-fed from one of eight header tanks via 16 individual supply pipes.


The Experimental Stream mesocosm network (ExStream) comprises replicate installations in New Zealand, China, Japan, Germany and Ireland and is coordinated by Asst. Prof. Jeremy J. Piggott at Trinity College Dublin (jeremy.piggott@tcd.ie).  

Controlled Parameters
  • Fine sediment load
  • Flow velocity
  • Nutrient concentration (DIN; nitrate-N and ammonium-N combined + dissolved reactive phosphorus (DRP) [Breitenbach Experiment]
  • Salinity (manipulation of sodium chloride) [Felderbach Experiment]
Research Topics

Multiple-stressor effects on stream communities

Facility location(s)
51.349722, 7.170583
Primary interests

Multiple stressor effecs on stream biodivrsity

Specialist areas

invertebrates, microorganisms, fungi.


Basic equipment. For more details, message facility contact.


At Felderback, private lodging.

Source of Information

Project website: http://genestream.de

ExStream Germany video: https://youtu.be/a67G0GH9COs

Photos of experiments/installations
Figure credit:Vasco Elbrecht
Photo credit: Vasco ELbrecht
Photo credit: Vasco Elbrecht
Figure credti: Jeremy (Jay) Piggott