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Title: Outdoor mesocosm system for evaluating aquatic herbicides : operating manual
Authors: University of North Texas. Institute of Applied Sciences.
Aquatic Plant Control Research Program (U.S.)
Dick, Gary Owen, 1956-
Getsinger, Kurt D.
Smart, R. Michael.
Keywords: Aquatic nuisance vegetation
Aquatic plants
Herbicide-concentration/exposure-time relationships
Chemical control
Submersed plant control
Issue Date: Mar-1997
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: The U.S. Army Engineer Waterways Experiment Station's (WES} Lewisville Aquatic Ecosystem Research Facility (LAERF), Lewisville, TX, has expanded its research capabilities with the addition of a large, outdoor aquatic mesocosm system. This multi-tank system is used to evaluate aquatic herbicides and plant growth regulators (PGRs) for achieving species-selective control of exotic nuisance aquatic plants, particularly Eurasian watermilfoil and hydrilla. The mesocosm system provides intermediate-scale verification, under more natural conditions, of laboratory-derived aquatic herbicide and PGR-concentration/exposure-time relationships developed at WES. This information is critical prior to conducting many field evaluations. The mesocosm system provides a combination of field (e.g., light, temperature) and controlled (e.g., water and sediment composition, flow-through rates) conditions for experimental purposes. The system consists of several primary components including 32 6,700-l aboveground fiberglass tanks, a 1.4 million-liter water supply reservoir, a water filtration, circulation, and aeration system, water drain and fill systems, a water detention pond, and a wetland retention cell. Various study-support facilities, including a small laboratory building, a large plant culture and grow-out pond, and a shading canopy are associated with the system. Information provided in this report on the design, operation, and maintenance of the LAERF mesocosm system can be used as an operating manual for the system. In addition, a description of the system's construction, including materials and components, is given. The design and function of the system allow researchers to evaluate the effects of herbicides and PGRs on target and nontarget plants, and to provide operational guidance for restoring native plant communities in aquatic ecosystems.
Appears in Collections:Miscellaneous Paper

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