Chronic toxicity of the bromoxynil formulation Buctril® to Daphnia magna exposed continuously and intermittently
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Abstract
Two chronic toxicity tests were conducted in which Daphnia magna were either continuously or intermittently exposed to bromoxynil octanoate (BO; as Buctril®) for 28 d. In the intermittent exposure test, daphnids were exposed to daily pulses of BO with 24-h mean concentrations equal to those in the continuous exposure test, and the peak concentrations were three times the 24-h mean values. After 28 d of continuous exposure to BO, survival of daphnids was reduced at 80 μg/L, whereas mean number of young per adult, intrinsic rate of natural increase, and mean weight of adults were all reduced at ⩾40 μg/L. Intermittent exposures to daily pulses of BO for 28 d caused reduced survival of daphnids at 24-h mean concentrations ⩾40 μg/L and reduced mean number of young per adult, intrinsic rate of natural increase, and mean weight of adults at 24-h mean concentrations ⩾20 μg/L. The estimated geometric mean-maximum acceptable toxicant concentrations of BO based on 24-h mean nominal values were 28 μg/L for continuous exposures and 14 μg/L for intermittent exposures. These results demonstrated that continuous-exposure studies may not be adequate in assessing herbicide toxicity to aquatic biota when concentrations fluctuate temporally.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Chronic toxicity of the bromoxynil formulation Buctril® to Daphnia magna exposed continuously and intermittently |
| Series title | Archives of Environmental Contamination and Toxicology |
| DOI | 10.1007/BF00212126 |
| Volume | 25 |
| Issue | 2 |
| Year Published | 1993 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Columbia Environmental Research Center |
| Description | 8 p. |
| First page | 152 |
| Last page | 159 |
| Google Analytic Metrics | Metrics page |