Abstract
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 cf. dubia was examined under both limited (3 - 104 cells/mL) and abundant (15 - 104 cells/mL) food conditions. Toxicity tests were conducted at both food concentrations simultaneously for each chemical, and cladocerans were examined daily from less than 24h 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.
| Original language | English |
|---|---|
| Pages (from-to) | 106-114 |
| Number of pages | 9 |
| Journal | Ecotoxicology and Environmental Safety |
| Volume | 51 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jan 2002 |
| Externally published | Yes |
Funding
The authors thank Moreno Julli and Takayoshi Kobayashi for comments on the manuscript. R. M. Rose was "nancially supported by an Australian Postgraduate Award and the research was supported by the New South Wales Environment Protection Authority and the University of Technology, Sydney.
Keywords
- 3,4-dichloroaniline
- Ceriodaphnia cf. dubia
- Chlorpyrifos
- Fenoxycarb
- Food concentration
- Life history
- Toxicity
ASJC Scopus subject areas
- Pollution
- Public Health, Environmental and Occupational Health
- Health, Toxicology and Mutagenesis
