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RECORD NUMBER: 40 OF 46

OLS Field Name OLS Field Data
Main Title Relationship of Methoxychlor to Periphyton Production under Laboratory and Semi-Natural Conditions.
Author Latt, William C. ; Weitze, Richard L. ;
CORP Author Michigan Univ., Ann Arbor. School of Natural Resources.
Year Published 1973
Report Number DI-14-31-0001-3522; OWRR-A-053-MICH; 07429,; A-053-MICH(1)
Stock Number PB-219 055
Additional Subjects ( Pesticides ; Ecology) ; ( Methoxychlor ; Primary biological productivity) ; Hydrocarbons ; Bacteria ; Algae ; Chlorophylls ; Bioassay ; Experimental data ; Carbinols ; Periphyton ; Ecosystems ; Triton X-100
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-219 055 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 54p
Abstract
The pesticide, methoxychlor, in a carrier solution of methanol and Trition X-100, was applied to periphyton communities grown under conditions of continuous flow laboratory bioassay using a natural water supply. A replicated experiment with controls and pesticide levels of 0.125 ppb, 0.25 ppb, 0.5 ppb, 1.0 ppb and 2.0 ppb was designed. A parallel experiment with controls utilized carrier solution levels equivalent to the 0.25 ppb and 2.0 ppb pesticide levels. In both experiments, dry weight and organic weight production (g/sq m/day) progressively increased from the controls through the 1.0 ppb levels and decreased from the 1.0 ppb level to the 2.0 ppb level. Analysis of chlorophyll a production (mg/sq m/day) showed an initial increase in productivity from the control to the 0.25 ppb pesticide level after which there was a progressive decrease through the 2.0 ppb level. The parallel experiment which dosed the carrier solution by itself indicated a progressive decrease in chlorophyll a production from the control to the 2.0 level. The data suggest that the methanol/Triton X-100 carrier solution by itself as well as methoxychlor in the carrier solution affected periphyton communities by inhibiting algal species or chlorophyll production, and selected for a nonalgal community.