Abstract
The cladocerans Ceriodaphnia dubia and Daphnia magna are widely used in environmental toxicity testing and the test methodologies for these species are well developed. However, copepods are a much more abundant contributor to zooplankton in many lakes, but they are not routinely used in toxicity tests. Therefore, we propose toxicity test methods for the freshwater copepod, Cyclops vernalis assessing effects on its survival and growth. A case study is presented in which the proposed test was performed with a range of concentrations of total dissolved solids (TDS) and used as part of a test battery to develop a site-specific water quality objective. C. vernalis was less sensitive to TDS compared to D. magna and C. dubia, but similarly sensitive to an alga, a diatom, a rotifer, a chironomid, and two fish species. No adverse effects were observed on survival or growth of C. vernalis at TDS concentrations up to 1500 mg/L.
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Acknowledgments
The authors thank the De Beers Canada Inc. Snap Lake Mine for funding this research as part of studies done to enable the environmentally safe operation of the Snap Lake Diamond Mine in the Northwest Territories of Canada. Dr. Peter Chapman is acknowledged for his useful contributions in reviewing an initial version of this manuscript.
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Marus, E.M., Elphick, J.R. & Bailey, H.C. A New Toxicity Test Using the Freshwater Copepod Cyclops vernalis . Bull Environ Contam Toxicol 95, 357–362 (2015). https://doi.org/10.1007/s00128-015-1592-7
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DOI: https://doi.org/10.1007/s00128-015-1592-7