John Wiley & Sons, Ltd.

Oil droplet ingestion and oil fouling in the copepod Calanus finmarchicus exposed to mechanically and chemically dispersed crude oil

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The rate of ingestion of oil micro droplets and oil fouling were investigated in the zooplankton filter‐feeder Calanus finmarchicus (Gunnerus, 1770) at three concentrations of oil dispersions ranging from 0.25 to 5.6 mg x L−1. In order to compare responses to mechanically and chemically dispersed oil, the copepods were exposed to comparable dispersions of micron‐sized oil droplets made with and without the use of a chemical dispersant (similar oil droplet size range and oil concentrations) together with a constant supply of microalgae for a period of four days. The filtration rates as well as accumulation of oil droplets decreased with increasing exposure concentration. Thus the estimated total amount of oil associated with the copepod biomass for the two lowest exposures in the range 11 ‐ 17 mL x kg−1 was significantly higher than the approximately 6 mL x kg‐1 found in the highest exposure. For the two lowest concentrations the filtration rates were significantly higher in the presence of chemical dispersant. Furthermore, a significant increase in the amount of accumulated oil in the presence of dispersant was observed in the low exposure group. This article is protected by copyright. All rights reserved

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