Effects of copper and the sea lice treatment Slice on nutrient release from marine sediments |
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| Authors: | DJ Mayor M Solan K Killham |
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| Institution: | a Oceanlab, University of Aberdeen, Main Street, Newburgh, Aberdeenshire AB41 6AA, UK
b School of Biological Sciences, Plant and Soil Department, Cruickshank Building, University of Aberdeen, St. Machar Drive, Aberdeen AB21 7AL, UK |
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| Abstract: | Copper-based antifoulant paints and the sea lice treatment Slice® are widely used, and often detectable in the sediments beneath farms where they are administered. Ten-day, whole sediment mesocosm experiments were conducted to examine how increasing sediment concentrations of copper or Slice® influenced final water column concentrations of ammonium-nitrogen (NH4-N), nitrate + nitrite-nitrogen (NOX-N) and phosphate-phosphorus (PO4-P) in the presence of the non-target, benthic organisms Corophium volutator and Hediste diversicolor. Nominal sediment concentrations of copper and Slice® had significant effects on the resulting concentrations of almost all nutrients examined. The overall trends in nutrient concentrations at the end of the 10-day incubations were highly similar between the trials with either copper or Slice®, irrespective of the invertebrate species present. This suggests that nutrient exchange from the experimental sediments was primarily influenced by the direct effect of copper/Slice® dose on the sediment microbial community, rather than the indirect effect of reduced bioturbation/irrigation due to increased macrofaunal mortality. |
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| Keywords: | Corophium volutator Hediste diversicolor Whole sediment bioassay Ecotoxicology Fish farming Biogeochemistry |
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