Woods Hole Oceanographic Institution

Tim Verslycke

»Copepod diapause
»Lobster Shell Disease
»Crustacean molting receptor
»Lobster Shell Disease
»Mysids as test models for endocrine disruption testing
»Chlorotriazines in the Scheldt estuary
»Energy allocation in grasshopper
»Estrogens in Scheldt estuary
»Marsupial development in mysids to evaluate endocrine disruption
»B[a]P effects on steroid metabolism in mysid
»Ciona CYP3 genes
»Methoprene, nonylphenol, and estrone effects on mysid vitellogenesis
»Methoprene effects on mysid molting
»Mysid growth
»Mysid vitellin ELISA
»Mysid vitellin
»An analytical method to detect estrogens in water
»High levels of endocrine disruptors in wild mysid populations
»Energy allocation in wild mysid populations
»Cellular energy allocation validation with scope for growth
»Dolphin delivery prediction
»PhD thesis
»Endocrine disruptor effects on steroid and energy metabolism in mysid
»Mysid review
»TBT effects on steroid metabolism in mysid
»Metal mixture toxicity to mysid
»TBT effects on energy metabolism in mysid
»dichlorobenzene effects in zebrafish
»Ethinylestradiol effects on amphipod sexual development
»Metabolic studies with mysids
»Abiotic stress and energy metabolism in mysid
»Induced vitellogenesis in rainbow trout
»Steroid metabolism in mysid
»Endocrine disruption in freshwater snails
»Invasive mysid in Belgium

Tim Verslycke, Marnix Vangheluwe, Dagobert Heijerick, Karel De Schamphelaere, Patrick Van Sprang, Colin Janssen, The toxicity of metal mixtures to the estuarine mysid Neomysis integer (Crustacea: Mysidacea) under changing salinity, Aquatic Toxicology 64: 307-315, 2003

Water quality criteria are mainly based on data obtained in toxicity tests with single toxicants. Several authors have demonstrated that this approach may be inadequate as the joint action of the chemicals is not taken into account. In this study, the combined effects of six metals on the European estuarine mysid Neomysis integer (Leach, 1814) were examined. Acute 96-h toxicity tests were performed with mercury, copper, cadmium, nickel, zinc and lead, and this as single compounds and as a mixture of all six. The concentrations of the individual metals of the equitoxic mixtures were calculated using the concentration/addition model. The 96-h LC50s for the single metals, at a salinity of 5, ranged from 6.9 to 1140 mg/l, with the following toxicity ranking: Hg>Cd>Cu>Zn>Ni>Pb. Increasing the salinity from 5 to 25 resulted in lower toxicity and lower concentrations of the free ion (as derived from speciation calculations) for all metals. This salinity effect was strongest for cadmium and lead and could be attributed to complexation with chloride ions. The toxicity of nickel, copper and zinc was affected to a smaller extent by salinity. The 96-h LC50 for mercury was the same for both salinities. In order to evaluate the influence of changing salinity conditions on the acute toxicity of metal mixtures, tests were performed at different salinities (5, 10, 15 and 25). The 96-h LC50 value (1.49 T.U.) of the metal mixture, at a salinity of 5, was clearly lower than the expected value (6 T.U.) based on the nonadditive hypothesis, thus confirming the additive effect of these metals in the marine/estuarine environment. Changing salinity had a profound effect on the toxicity of the mixture. The toxicity clearly decreased with increasing salinity until 15. Higher salinities (25) had no further influence on the 96-h LC50 of the mixture which is situated at a value between 4.4 and 4.6. Finally, the relative sensitivity to the selected metals was compared with the relative sensitivity of the commonly used mysid Americamysis (= Mysidopsis) bahia. doi:10.1016/S0166-445X(03)00061-4

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