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THE PHOTOTACTIC BEHAVIOR OF DAPHNIA MAGNA AS AN INDICATOR OF CHRONIC TOXICITY

THE PHOTOTACTIC BEHAVIOR OF DAPHNIA MAGNA AS AN INDICATOR OF CHRONIC TOXICITY,Linda J. Whitman,Rudolph J. Miller

THE PHOTOTACTIC BEHAVIOR OF DAPHNIA MAGNA AS AN INDICATOR OF CHRONIC TOXICITY   (Citations: 7)
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The objective of this study was to develop a chronic bioassay technique to rapidly screen chemicals for potential toxic effects. The phototactic behavior of Daphnia magna was used for that purpose. Negative phototaxis was elicited by switching the direction of light imposed on a population of 20 adult Daphnia. The percent population that responded by swimming a marked vertical distance in 30 seconds was recorded. At least 5 replicates were used for each experiment or treatment, and the results presented as the mean response (%) of the 5 replicates. A number of variables influencing phototactic behavior were explored, including light intensity, circadian rhythms, annual rhythms, food deprivation, culture techniques, and temperature. Finally, the effects of naphthalene on phototactic behavior was determined. The present report deals with light intensity and temperature effects, and the effects of exposure to three concentrations of naphthalene. At a light intensity of at least 250 foot-candles, the mean phototactic response of healthy Daphnia populations was at least 75% in most of the experiments. Of the variables explored, the effects of experimental water temperature had a dominating influence over phototactic behavior. Naphthalene completely inhibited phototactic responses at a concentration of 2.0 mg/l and phototaxis was significantly depressed at 1.5 mg/l and 1.0 mg /l.
Published in 1982.
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