Journal article
Mixture effects of the nonylphenyl polyethoxylate, R-11 and the insecticide, imidacloprid on population growth rate and other parameters of the crustacean, Ceriodaphnia dubia
Ecotoxicology and environmental safety, Vol.73(2), pp.132-137
2010
Handle:
https://hdl.handle.net/2376/115541
PMID: 19833391
Abstract
The toxicity of the nonylphenol polyethoxylate, R-11 and the neonicotinoid insecticide, imidacloprid were evaluated on the crustacean,
Ceriodaphnia dubia Richard. These compounds were evaluated separately and as a mixture because they are applied for pest control and may exist as a binary mixture in surface water. Acute mortality estimates (48
h) were developed followed by population-level studies after chronic exposure. LC50s and 95% CL for R-11 and imidacloprid were 9241 (8521–9842)
μg/l and 2.1 (1.1–3.4)
μg/l, respectively. In the population study,
C. dubia were exposed to concentrations equivalent to the acute LC25 for R-11 (8090
μg/l) and imidacloprid (0.3
μg/l) separately and as a mixture for 8
d. The results of the chronic study indicated that R-11 had a greater impact on population parameters than imidacloprid and the mixture had a greater impact than either compound alone. For example, the total number of individuals at the end of the chronic study was 73%, 19%, and 6% of the control for imidacloprid, R-11, and the binary mixture, respectively. Additionally, exposure to R-11, imidacloprid, and the mixture resulted in 52%, 10%, and 91% reductions in population growth rate compared to the control, respectively. The results of this study indicate that when combined, R-11 and imidacloprid act in a more than additive manner. Therefore, it is important that their potential effects on aquatic organisms be evaluated together.
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Details
- Title
- Mixture effects of the nonylphenyl polyethoxylate, R-11 and the insecticide, imidacloprid on population growth rate and other parameters of the crustacean, Ceriodaphnia dubia
- Creators
- Xue Dong Chen - Ecotoxicology Program, Department of Entomology, Washington State University, Puyallup Research and Extension Center, Puyallup, WA 98371, USAElizabeth Culbert - Food and Environmental Quality Laboratory, Department of Entomology, Washington State University, Richland, WA 99354, USAVince Hebert - Food and Environmental Quality Laboratory, Department of Entomology, Washington State University, Richland, WA 99354, USAJohn D Stark - Ecotoxicology Program, Department of Entomology, Washington State University, Puyallup Research and Extension Center, Puyallup, WA 98371, USA
- Publication Details
- Ecotoxicology and environmental safety, Vol.73(2), pp.132-137
- Academic Unit
- Entomology, Department of
- Publisher
- Elsevier Inc
- Identifiers
- 99900548090001842
- Language
- English
- Resource Type
- Journal article