Record Display for the EPA National Library Catalog


Main Title Effects of Chlorpyrios on Macroinvertebrates in Littoral Enclosures.
Author Jensen, D. A. ; Brazner, J. C. ;
CORP Author Environmental Research Lab.-Duluth, MN. ;Wisconsin Univ.-Superior.
Year Published 1987
Report Number EPA/600/D-87/336;
Stock Number PB88-132238
Additional Subjects Culcidae ; Invertebrates ; Insecticides ; Toxicity ; Concentration(Composition) ; Diptera ; Populations ; Worms ; Exposure ; Bioassay ; Pesticides ; Clams ; Ponds ; Chloropyrifos ; Ecosystems
Library Call Number Additional Info Location Last
NTIS  PB88-132238 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
Aquatic enclosures constructed in the littoral zone of a 0.72 ha pond in central Minnesota, were used to evaluate the impact of a mosquito larvicide chlorpyrifos on endemic macroinvertebrate communities. Chlorpyrifos was acutely toxic to several macroinvertebrates at a peak concentration of 17.3 micrograms/l. Midge (Chironomidae), mayfly (Caenis sp.) caddisfly (Leptocerus americanus) and damselfly (Enallagma hageni) populations were reduced or eliminated after application. However, oligochaete, snail, ostracod and clam populations increased in the treatment enclosure by the end of the experiment. The littoral enclosure design proved to be an effective technique for evaluating primary (acute) effects of a pesticide on a natural pond ecosystem, and should be readily adaptable to more complex experimental designs requiring replication of experimental units and longer-term studies.