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.
Suggested Citation
Buhl, K.J., Hamilton, S., Schmulbach, J.C., 1993, Chronic toxicity of the bromoxynil formulation Buctril® to Daphnia magna exposed continuously and intermittently: Archives of Environmental Contamination and Toxicology, v. 25, no. 2, p. 152-159, https://doi.org/10.1007/BF00212126.
| 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 |