John Wiley & Sons, Ltd.

Comparison of aquatic and dietary exposure of heavy metals Cd, Cu and Zn to benthic ostracod Heterocypris incongruens

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Benthic ostracod Heterocypris incongruens is now becoming important tool for ecotoxicological assessment of contaminated sediments. However, there is not study yet performed on solid phase (dietary exposure) to ostracod. The present study examined the effects of metals to H. incongruens through aquatic and dietary exposures. The algal food Chlorella vulgaris was exposed to different concentrations of Cd, Cu and Zn and subcellular distributions of these metals in algal cells were determined. Parallel experiments were also performed to determine the toxic effect of dissolved metals to ostracod through aqueous exposure. Significant toxic effects on mortality were observed when ostracod was fed with Cd‐contaminated (47 to 100%) and Cu‐contaminated algae (55 to 100%). With increasing accumulated Zn in the algal cell, ostracod mortality also increased (20 to 83%). Aquatic exposure of ostracod to different concentrations of dissolved Cd (3.2 to 339 µg Cd/L) and Cu (260 to 2600 µg Cu/L) resulted in high observed mortalities (57 to 100% and 95 to 100%, respectively). Based on the results of aqueous and dietary exposure tests, it can be concluded that both exposure routes are important in evaluating the toxic effect of Cd to ostracod. Comparing these with the results of tests using other metals (i.e. Cu and Zn), similar results were observed thus, showing the importance of considering not only aquatic exposure but dietary exposure routes as well when evaluating metal toxicity to ostracod. Environ Toxicol Chem © 2014 SETAC

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