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 |
Checkout Status |
NTIS |
PB-219 055 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
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. |
Highlights Notes |
Discusses experimental results of the effects of the pesticide, methoxychlor, on periphyton biota. |
NTIS Title Notes |
Project completion rept. 1 Jul 71-30 Sep 72. |
PUB Date Free Form |
Mar 73, |
Category Codes |
6F; 57H; 68E# |
NTIS Prices |
PC A04/MF A01 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
326560635 |
Origin |
NTIS |
Type |
CAT |