Lethal and sublethal effects of the sediment-associated PCB aroclor 1254 on a meiobenthic copepod
| Autor: | Lisa M. DiPinto, Bruce C. Coull, G. Thomas Chandler |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
biology
Health Toxicology and Mutagenesis media_common.quotation_subject Polychlorinated biphenyl biology.organism_classification Crustacean Median lethal dose Acute toxicity Toxicology chemistry.chemical_compound Animal science chemistry Toxicity Environmental Chemistry Bioassay Reproduction Copepod media_common |
| Zdroj: | Environmental Toxicology and Chemistry. 12:1909-1918 |
| ISSN: | 1552-8618 0730-7268 |
| DOI: | 10.1002/etc.5620121017 |
| Popis: | Acute toxicity tests were performed on field-collected copepods (Microarthridion littorale) using the sediment-associated polychlorinated biphenyl (PCB) Aroclor 1254 (i.e., PCB concentrations in bulk sediments in the bound and/or unbound states). Three replicates of 50 adult copepods were exposed to five levels of PCB-contaminated sediments for 96 h and compared to untreated controls and solvent controls. LC50 concentrations were nearly twice as high for females as for males. To determine the effects of the PCB on reproductive output of the copepods, copulating pairs of Microarthridion littorale were allowed to reproduce in concentrations of Aroclor 1254-contaminated sediments below LC50 values. Two experimental trials with 10 and 15 replicates, each with one pair of Microarthridion littorale in copulus, were conducted for 12 d, the normal time needed for females to produce one set of nauplii and carry a second clutch of eggs. In both experiments, a significant decrease in number of nauplii was found with Aroclor contamination. Although NOECs were not determined, high concentrations of the sediment-associated Aroclor NOECs were required to affect mortality significantly, whereas lower levels impaired reproduction. |
| Databáze: | OpenAIRE |
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