Abstract
Species of the harpacticoid copepod genus Microsetella are commonly reported to occur in Arctic and sub-Arctic coastal waters, but nothing has yet been reported on their sensitivity towards toxic substances. Effects of the polyaromatic hydrocarbon pyrene on Microsetella spp. from Western Greenland were investigated by looking at survival of females, feeding status, and nucleic acid content after a 96-h exposure. Less than 10% survived at 100 nM exposure concentration, and a 50% reduced survival was also evident at 0.1 and 10 nM. The RNA:DNA ratio was significantly higher, 2.1 ng/individual, at the lowest concentration of 0.01 nM compared to 0.9 ng/individual in the control, which indicates increased metabolic activities. A reduced DNA content in higher exposure concentrations of 1–100 nM suggests inhibition of egg development. Gut content was significantly declining with increasing exposure concentrations with only 2% of exposed females displaying full guts at 100 nM pyrene. Together with reduced feeding activity, effects at the population level can be anticipated, but would have to be confirmed in future experiments. The data suggests a higher sensitivity of Microsetella spp. compared to other Arctic copepods, which implies more severe effects from oil on the pelagic food web in the areas and periods where Microsetella spp. dominates Arctic plankton food webs.
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Acknowledgments
The Department of Arctic Technology at the Danish Technical University Sisimiut, Greenland, is gratefully acknowledged for providing laboratory facilities, and Morten Holtegaard Nielsen, also at ARKTEK/DTU, is acknowledged for assisting with CTD data.
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Hjorth, M., Dahllöf, I. A harpacticoid copepod Microsetella spp. from sub-Arctic coastal waters and its sensitivity towards the polyaromatic hydrocarbon pyrene. Polar Biol 31, 1437–1443 (2008). https://doi.org/10.1007/s00300-008-0483-3
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DOI: https://doi.org/10.1007/s00300-008-0483-3