Chronic effects of 2,2'-dichlorobiphenyl on reproduction, mortality, growth, and respiration of daphnia pulicaria
Previous studies have shown toxic effects of polychlorinated biphenyls (PCBs) on aquatic life only in the micro g/L range, well above normal ambient concentrations. Daphnia pulicaria was isolated from Lake Erie and exposed to 50 ng/L to 10 micro g/L of 2,2'-dichlorobiphenyl (DCB) in lifetable and physiological studies. Reproduction, mortality, growth, and respiration were measured for periods up to the entire lifespan of the animal with and without the use of an organic surfactant. Significant mortality and inhibition of reproduction were found at levels as low as 50-100 ng/L in lifetable studies, and no safe level could be determined. A unique, yet repeatable, dose-response curve occurred in lifetables with maximum inhibition at low to intermediate concentrations. Inhibition at the highest level tested, 10 micro g/L, occurred only after continuous exposure for three generations. Increasing concentrations of CBD stimulated growth, while respiration experiments yielded variable results.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (USA). Dept. of Ecology and Behavioral Biology
- OSTI ID:
- 6967738
- Report Number(s):
- PB-90-147638/XAB
- Resource Relation:
- Other Information: Pub. in Archives of Environmental Contamination and Toxicology, Vol. 17, 731-740(1988)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHLORINATED AROMATIC HYDROCARBONS
TOXICITY
DAPHNIA
SENSITIVITY
ANIMAL GROWTH
BIPHENYL
DOSE-RESPONSE RELATIONSHIPS
MORTALITY
RESPIRATION
WATER POLLUTION
ANIMALS
AQUATIC ORGANISMS
AROMATICS
ARTHROPODS
BRANCHIOPODS
CRUSTACEANS
GROWTH
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
INVERTEBRATES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION
560300* - Chemicals Metabolism & Toxicology