1) WCL – WasserCluster Lunz
Dr. Carl Kupelwieser Promenade 5
A-3293 Lunz am See
2) Institute of Hydrobiology and Aquatic Ecosystem Management (IHG)
University of Natural Resources and Life Sciences (BOKU)
40 land-based mesososms (320 L each); water pipes for aeration and mixing; exchangeable inner walls; app. 500 m from lake; local tab water suitable for experiments (not chlorinated)
24 land-based mesososms (400 L each), temperatured controlled, aerated, temperature sensors, remote controlled
consists of two large channels (40 m length, 6 m width) fed with nutrient-poor lake water taken at different depths to vary water temperature. Peak flows of up to 600 l/s are produced to mimic hydropeaking, thermopeaking or extreme floods.
Channel size and morphology (slopes, structures substratum, etc.) is alterable, flow can be controlled, various experiments with different biological elements (fish, benthic invertebrates, algae, etc.) can be conducted in parallel (smaller sub-flumes within each large one) short-time and long-time experiments can be done simultaneously
Air flow; possibly shading; nutrient levels
Temperature, air flow
Discharge, ramping rates of discharge, water temperature, substrate, channel morphology
Role of dispersal for maintenance of diversity; diversity-functioning research in plankton communities
Effects of temperature, heat waves, light, brownification on phytoplankton and zooplankton biodiversity and biochemical composition (elemental stoichiometry, fatty acids)
Hydropeaking-related effects on various aquatic organism groups (juvenile fish, macroinvertebrates and development of benthic algae) and ecosystem processes such as litter decay, primary production
Effects of thermopeaking, analyses of multiple pressures (discharge, nutrients and temperature)
Fish protection and fish guidance efficiency (experiments with a flexible fish fence)
Lunz am See, 150 km southwest of Vienna, Austria
he Lunz Mesocosm Infrastructure (LMI) belongs to WasserCluster Lunz (WCL), an inter-university research centre of the University of Vienna, the University of Natural Resources and Life Sciences Vienna (BOKU) and the Danube University Krems. It includes 2 permanent land-based mesocosm systems (Fig. 6.10.1): 40 mesocosms holding 320 l of water each are equipped with a special port to minimize sample contact in experiments targeting dispersal limitation; 24 additional mesocosms holding 400 L each and placed next to a cabin are equipped with a filling system filtering water, a computer- controlled heating system and aerators. In addition, LMI comprises 50 enclosures (1 m diameter, variable depth 2-15 m) floating in Lake Lunz, 2 experimental river flumes referred to as the Hydromorphological and Temperature Experimental Channels (HyTEC) and the Lunz Flumes (Fig. 6.10.2). HyTEC consists of two large channels (40 m length, 6 m width) that can each be subdivided into up to 4 small flumes fed with nutrient-poor lake water. Peak flows of up to 600 l/s can be generated to mimic events such hydro- or thermopeaking or extreme floods. The Lunz Flumes consist of 6 streamside channels (40 m long, 0.4 m wide) that are continuously fed with stream water. Basic hydraulic and sediment characteristics can be adjusted and solutes such as inorganic nutrients or DOM be added.
Available infrastructure and instruments beyond the mesocosm facilities include 3 boats and 2 cars; several standard labs, a radio-isotope lab (3H, 14C); walk-in environmental chambers; an elemental analyser coupled to an isotope-ratio mass spectrometer (IRMS); GC-FID/MS for analysing fatty acids, HPLC for pigment and amino acid analysis, flow cytometer to analyse small phyto- and bacterioplankton, total organic carbon (TOC) analyser, autoanalyser for nutrients analyses; bench spectrophotometer and fluorometer; PhytoPAM fluorometer; and dissecting, bright-field, inverted and epifluorescence microscopes. Field gear and instrumentation is also available. This includes various standard sampling gear, nets of various mesh sizes to fractionate plankton, water collection tubes. temperature sensors. Equipment and gear used in the HyTEC river flumes include a fully automated discharge and water-temperature interface, data loggers, a flow velocity measurement systems, a remote-controlled (IR) video system, electrofishing devices, sampling gear, tanks for hatching and maintaining fish, etc.
Fig. 6.10.1. Two mesocosm systems at WasserCluster Lunz (WCL) in Lunz am See, Austria
Fig. 6.10.2. Experimental river flumes HyTEC (left) and Lunz Flumes (right) at WCL, Austria
Sampling gear; standard water chemistry; meshes for size fractionation; water pre-filtration for filling mesocosms
Sampling gear, incl. plankton nets, water collection tubes, temperature gauges, heaters, aerators, computer controlled temperature systems, wooden cabin next to mesocosms Access to analyses (with costs)
Elemental analyses of C, N, S, O, H and stable isotopes, TOC analyser
Fully automated discharge and water temperature interface, datalogger, flow velocity measurement systems, remote-controlled (IR-) video system, electrofishing devices, sampling gears, several tanks for fish hatchery, etc.
Cooperation with WasserCluster Lunz: experiments (benthic algae), field equipment and laboratory-infrastructure (nutrient analyses, DOC analyses, microscopy, HPLC)
A total of at least 1040 person-days will be allocated to external users through AQUACOSM Transnational Access provision in years 2-4. Access to a minimum of 8 persons is offered for 40 person-days. The partly temperature-controlled mesocosms will be accessible year round during reserved time slots. Further details about Transnational Access provision at all facilities are described in WP1. Additional charges may apply to special services such as stable-isotope or HPLC analyses.
Services currently offered by the infrastructure: Users will have access to mesocosms office and lab space and the equipment described above. Modern guest rooms for up to 20 users are available. Ample additional lodging options exist in Lunz. Additional facilities and instruments can be made available at the universities in Vienna (2 h drive). Users of LMI will benefit from exceptional scientific experience of the local staff with aquatic mesocosm experiments, long-term data on Lake Lunz and the local streams (Lunzer Seebach), and expertise in freshwater biodiversity, aquatic ecology and biogeochemistry of the academic and technical WCL staff, which has pursued a highly active and international research programme of over the past 20 years.
Support offered under AQUACOSM: Users will have access to office and lab space, dormitories and other lodging facilities as well as equipment available at the WCL. Cooperation with local scientists is encouraged to take full advantage of their expertise and access to analytical instruments. Technical assistants at WCL will train all users prior to and during their research activities. Coordination meetings before each experiment will optimize the scientific outcome of all activities.
Some guestrooms at WasserCluster Lunz; numerous guesthouses in Lunz am See