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|Development of chronic sublethal bioassay for evaluating contaminated sediment with the marine polychaete worm Nereis (Neanthes) arenaceodentata
|Dillon, T. M. (Tom M.)
Moore, David W.
Gibson, Alfreda B.
|Environmental Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station.
|Miscellaneous Paper ; D-94-5
|Abstract: Development of a chronic sublethal sediment bioassay with the polychaete Nereis (Neathes) arenaceodentata is described. The sublethal test end point was estimated individual somatic growth rate (milligrams dry weight per day). The test was initiated with 2- to 3-week-old postemergent juvenile worms and continued for 28 days. The potential bias due to selected nontreatment factors on polychaete survival and growth was evaluated. For example, grain size had no significant effect, whereas the number of worms placed in each exposure vessel was critical. Direct transfer from 30 ppt seawater to salinities ~ 15 ppt had a highly significant and adverse effect on survival and growth. Both survival and growth of juvenile worms may be adversely affected if test conditions involve exposures to ~ 0.7 mg/L un-ionized ammonia or~ 5 mg/L hydrogen sulfide. Survival of juvenile worms to concentrations of the reference toxicant, cadmium chloride, approximating the 96-hr LC50 (5 mg/L) was used as a quality control measure. Results are expressed in control chart format analogous to methods used in analytical chemistry.
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