Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 51, Issue 2, Pages 106-114Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/eesa.2001.2137
Keywords
food concentration; life history; Ceriodaphnia cf. dubia; toxicity; 3,4-dichloroaniline; fenoxycarb; chlorpyrifos
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The effect of three chemicals with different mechanisms of action (3,4-dichloroaniline, fenoxycarb, and chlorpyrifos) on the life history response of the cladoceran Ceriodaphnia cc dubia was examined under both limited (3 X 10(4) cells/mL) and abundant (15 X 10(4) cells/mL) food conditions. Toxicity tests were conducted at both food concentrations simultaneously for each chemical, and cladocerans were examined daily from less than 24 h old until their death. A range of life history parameters were calculated, including mean brood sizes, survival, net reproductive rate, and population growth rate. The toxicity of 3,4-dichloroaniline was not significantly affected by food concentration. However, limited food significantly decreased the toxicity of fenoxycarb, and significantly increased the toxicity of chlorpyrifos. The effect of food concentration on toxicity appears to depend on the mechanism by which the chemical exerts its toxicity and on food-chemical interactions. Possible mechanisms for the different effects of food concentration on toxicity are discussed. (C) 2002 Elsevier Science (USA).
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