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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 723

Edward D. Schaefer and Wesley O. Pipes; Temperature and the toxicity of chromate and arsenate to the rotifer, Philodina roseola. Water Research 7:1781-1790, 1973

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In this study the interaction of three different variables; time, temperature and TLm was investigated. The objective of the study was to determine the form of the time, temperature and toxicity relationships in order to provide a better basis for predicting "safe" concentrations from short term bioassay data and to illustrate the effect of temperature upon both short term toxicity and "safe" concentrations. The hypotheses formulated were: (1) For short term exposure aquatic organisms can withstand higher concentrations of toxic materials at lower temperature than at higher temperatures; (2) The longer the exposure time the less the effect of temperature on the concentration at which half of the test organisms are killed; and (3) Short term bioassay data can be used to predict the concentration of the toxic material which will not change the median life span of the test organism.