John Wiley & Sons, Ltd.

Exploration of daphnia behavioral effect profiles induced by a broad range of toxicants with different modes of action

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Behavior is increasingly reported as a sensitive and early indicator of toxicant stress in aquatic organisms. However, the systematic understanding of behavioral effects and comparisons between effect profiles is hampered because the available studies are limited to few chemicals and differ in the exposure conditions and effect parameters examined. The aims of this study were (i) to explore behavioral responses of Daphnia magna exposed to different toxicants, (ii) to compare behavioral effect profiles with regard to chemical modes of action and (iii) to determine the sensitivity and response time of behavioral parameters in a new multi‐cell exposure system named “Multi‐DaphTrack” compared to currently utilized tests. Twelve compounds covering different modes of toxic action were selected to sample a wide range of potential effect profiles. Acute standard immobilization tests and 48 h of behavioral tracking were performed in the customized “Multi‐DaphTrack” system and a single‐cell commercialized biological early warning system (BEWS). Contrasting behavioral profiles were observed for average speed (i.e., intensity, time of effect onset, effect duration), but no distinct behavioral profiles could be drawn from the chemical mode of action. Most compounds tested in the “multi‐DaphTrack” system induced an early and significant average speed increase at concentrations near or below the EC10 (48 h) of the acute immobilization test, demonstrating that the “Multi‐DaphTrack” system is fast and sensitive. To conclude, behavior endpoints could be used as an alternative or complement to the current acute standard test or chemical analysis for the predictive evaluation of ecotoxic effects of effluents or water bodies. This article is protected by copyright. All rights reserved

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