Life-table evaluation of sediment-associated chlorpyrifos chronic toxicity to the benthic copepod, Amphiascus tenuiremis
| Autor: | A. S. Green, G. T. Chandler |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Insecticides
Health Toxicology and Mutagenesis media_common.quotation_subject Population Biology Toxicology chemistry.chemical_compound Crustacea Animals Soil Pollutants Ecotoxicology Life Tables education Chronic toxicity media_common education.field_of_study Reproduction General Medicine Pesticide biology.organism_classification Fecundity Pollution chemistry Chlorpyrifos Female Water Pollutants Chemical Copepod |
| Zdroj: | Archives of Environmental Contamination and Toxicology. 31:77-83 |
| ISSN: | 1432-0703 0090-4341 |
| Popis: | A partial life-cycle experiment was conducted to assess chronic effects of sediment-associated chlorpyrifos, an organophosphate pesticide, on a marine, benthic copepod population. The static-renewal experiment was initiated with 4 treatments including control, 13 replicates per treatment with one female (bearing first clutch of eggs) per replicate. No males were added because one fertilization is sufficient for several clutches. Once weekly, all replicate chamber contents (10-ml culture tubes with 1.5 ml of sediment and 5 ml of seawater) were sieved and enumerated to determine survival and fecundity. Surviving adult females were placed back into chambers with newly spiked sediments. This process was repeated for 7 weeks until all initial females were dead or reproduction had ceased for at least two weeks. Survival and fecundity data were then used to determine population dynamic parameters such as r (intrinsic rate of natural increase) for each treatment. Results revealed a chronic toxicity response with significant population effects (p |
| Databáze: | OpenAIRE |
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