. Bulletin. Natural history; Natural history. June, 1971 Reinbold et al. : Biodegradability of DDT and Methoxychlor 411 dicate that methoxychlor is readily bio- degradable in tilapia and green sunfish. It seems likely that this insecticide is also biodegradable in other fish species. Uptake and Metabolism by Daphnia and Snails Daphnia also concentrated both me- thoxychlor and DDT taken up from water. The DDT-to-methoxychlor ratio (Table 3) in daphnia after 3 days of exposure at the three insecticide levels used in these experiments ranged from to , a pattern similar to that dis- played
. Bulletin. Natural history; Natural history. June, 1971 Reinbold et al. : Biodegradability of DDT and Methoxychlor 411 dicate that methoxychlor is readily bio- degradable in tilapia and green sunfish. It seems likely that this insecticide is also biodegradable in other fish species. Uptake and Metabolism by Daphnia and Snails Daphnia also concentrated both me- thoxychlor and DDT taken up from water. The DDT-to-methoxychlor ratio (Table 3) in daphnia after 3 days of exposure at the three insecticide levels used in these experiments ranged from to , a pattern similar to that dis- played by the fishes we studied. When daphnia and snails were held together in jars containing ppm of insecticide, daphnia concentrated the two insecticides at about the same rate, but the snails concentrated me- Table 3. â Comparotive uptake fr< 3ter of "C-DDT and ^H-methoxychlor by daphni( Insecticide Concen- tration Days of Exposure to Insec- ticide Insecticide Concentration'^ in ppm in Daphnia Ratio of DDT to in Water in ppm Methoxy- chlor DDT Methoxychlor 3 6 11 9 28 15 3 6 37 22 66 32 3 6 143 316 83 â¢All such concentrations were calculated on a dry-weight basis. 40 n â DDT ⢠METHOXYCHLOR DAPHNIA SNAILS. Fig, 3. â Comparative uptake of "C-DDT and ^H-metlioxycfilor by snails and daphnia following exposure to a insec- ticide level in water. T I 2 3 EXPOSURE TIME (DAYS). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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