Record Display for the EPA National Library Catalog


Main Title Littoral Enclosure for Replicated Field Experiments.
Author Brazner, J. C. ; Heinis, L. J. ; Jensen, D. A. ;
CORP Author Environmental Research Lab.-Duluth, MN. ;Wisconsin Univ.-Superior. Center for Lake Superior Environmental Studies.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/272;
Stock Number PB90-185166
Additional Subjects Pesticides ; Field tests ; Enclosures ; Aquatic biology ; Tables(Data) ; Reproducibility ; Reprints ; Test facilities ; Dursban ; Chlorpyrifoo
Library Call Number Additional Info Location Last
NTIS  PB90-185166 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
A design for 5 X 10 m littoral enclosures that extend 10 m from the shoreline into the zone of submergent vegetation and incorporate undisturbed natural sediments for the bottom is presented and construction techniques are described. This type of enclosure was used to study the responses of caged and free-living pond biota and the physical and chemical environment to a single application of Dursban (R) (chlorpyrifos) during the summer of 1986 as part of the development of a field testing protocol for pesticides needed by the U.S. Environmental Protection Agency Office of Pesticide Programs. Chlorpyrifos was added to 12 littoral enclosures built within a mesotrophic, 2-ha pond near Duluth, Minnesota, at nominal concentrations of 0.0, 0.5, 5.0 or 20.0 micro g/L. The enclosures proved to be both economical and durable and were useful for detecting direct and indirect (ecological) effects of the pesticide. Coefficients of variation (C.V.) associated with the chemical and biological response variables typically ranged from 10 to 40%. The ability to simultaneously monitor many response variables in replicate enclosures at a relatively low cost suggests that the littoral enclosure design should be useful for studying the effects of pesticide or other pollutant additions to natural aquatic systems.