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Brittlestars,Biomarkers and Beryl: Assessing the Toxicity of Oil-Based Drill Cuttings Using Laboratory,Mesocosm and Field Studies
Authors:Lyn C. Newton  J. Douglas McKenzie
Affiliation:1. Scottish Association for Marine Science , Dunstaffnage Marine Laboratory , Oban, Argyll, PA34 4AD, UK;2. Napier University , Edinburgh, UK;3. Faculty of Applied Science , University of the West of England , Bristol, UK;4. Scottish Association for Marine Science , Dunstaffnage Marine Laboratory , Oban, Argyll, PA34 4AD, UK
Abstract:Effects of drill cuttings on burrowing brittlestars (Amphiura chiajei and A. filiformls) were compared at different levels of response, from acute laboratory experiments to chronic field studies. Acute toxicity tests showed that drill cuttings containing oil-based muds had a very low toxicity (LC50 52,800 ppm total hydrocarbons in test sediment) but sub-lethal effects were detected at much lower levels using a variety of biomarkers and assays. Chronic sub-lethal effects were detected around the Beryl oil platform in the North Sea where the levels of oil in the sediment were very low (<3 ppm total hydrocarbons in sediment) and brittlestars were excluded from areas nearer the platform with higher sediment oil content. These results suggest that acute toxicity tests are a poor predictor of chronic response in these animals. the relationship between toxicity at different levels of response and the predictive power of laboratory studies is discussed.
Keywords:Oil drill cuttings  pollution  sub-lethal assays  linking levels of response  ophiuroids
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