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|Title:||Chronic sublethal effects of San Francisco Bay sediments on Nereis (Neanthes) Arenaceodentata : nontreatment factors|
|Authors:||United States. Army. Corps of Engineers. San Francisco District.|
Long-Term Effects of Dredging Operations Program (U.S.)
Moore, David W.
Dillon, T. M. (Tom M.)
|Keywords:||Nereis (Neanthes) arenaceodentata|
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Initial development of a chronic sublethal sediment bioassay with the polychaete Nereis (Neanthes) arenaceodentata is described. The test was initiated with 2- to 3-week-old pbstemergent juvenile worms and terminated after 21 days. The sublethal test end point was estimated individual somatic growth rate (milligrams dry weight/day). The potential bias due to selected nontreatment factors on polychaete survival and growth was evaluated. For example, grain size had no effect, while the number of worms added to each exposure vessel was critical. Direct transfer from 30 ppt 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 ≥20 mg/L ammonia or ≥5.5 mg/L hydrogen sulfide.
|Appears in Collections:||Miscellaneous Paper|