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OLS Field Name OLS Field Data
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 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 14p
Abstract 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.
Supplementary Notes Prepared in cooperation with Wisconsin Univ.-Superior.
PUB Date Free Form Nov 87
Category Codes 57P; 57Y
NTIS Prices PC A03/MF A01
Primary Description 600/03
Document Type NT
Cataloging Source NTIS/MT
Control Number 805618701
Origin NTIS
Type CAT