Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Effects of Malathion on Microorganisms of an Artificial Salt-Marsh Environment.
Author Bourquin., A. W. ;
CORP Author Environmental Research Lab., Gulf Breeze, Fla.
Year Published 1977
Report Number EPA/600/J-77/065 ;CONTRIB-312;
Stock Number PB-277 153
Additional Subjects Marine microorganisms ; Malathion ; Pesticides ; Marshes ; Ecology ; Water pollution ; Bioassay ; Phosphorus organic compounds ; Bacteria ; Degradation ; Chlorine aliphatic compounds ; Metabolism ; Chlorine organic compounds ; Sediments ; Abundance ; Laboratories ; Monitoring ; Reprints ; Salt marshes ; Mirex ; Kepone ; Methanocyclobuta (cd) pentalenes ; Water pollution effects(Animals)
Library Call Number Additional Info Location Last
NTIS  PB-277 153 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 9p
Laboratory salt-marsh environments were treated with malathion, an organophosphate insectide, and aerobic heterotrophic bacteria were monitored to determine changes in their microbial ecology. Several physiological activities were assayed in both treated and untreated controls; however, no reliable trends in numbers of these microorganisms were detected. Populations of malathion sole-carbon-degrading bacteria increased significantly with increasing treatment levels and in the sediments with repeated treatment. Malathion cometabolizing bacteria increased significantly over the control systems in the water column with increasing treatment levels. Although numbers of malathion-degrading bacteria increased with higher treatment levels or frequency of treatment, these changes had no effect on the total numbers of bacteria from the water or sediment. When an organochlorine insecticide, mirex, was used to treat the ecosystems, essentially no changes in the bacterial populations were detected.