Abstract
Invertebrate communities of lentic habitats comprise, amongst others, the crustacean Asellus aquaticus (Isopoda) and the turbellarian Dendrocoelum lacteum (Tricladida). Because D. lacteum preferentially preys on A. aquaticus, contaminants introduced into the aquatic environment may affect this predator–prey interaction, finally influencing the performance of the predator. However, no studies investigating implications of organic pollutants on this food web subsystem currently exist. Hence, the present study assessed short-term implications of pesticides with different modes of action, namely, the triazole fungicide tebuconazole and the pyrethroid insecticide lambda-cyhalothrin, during a 72 h trial. The experiments for tebuconazole showed a statistically significant decrease in predatory success of D. lacteum. Lambda-cyhalothrin, in contrast, increased predation success by 40%, which is, however, not statistically significant. Both the decrease and the increase in predation seemed to be primarily driven by an altered activity of the prey A. aquaticus. This may be hypothesized because any shift in the prey’s activity influenced its probability to stick to mucus, a viscous substance released by D. lacteum, or to encounter the predator directly.
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Acknowledgments
The authors thank the Fix-Stiftung, Landau, for financial support of research infrastructure as well as T. Bürgi for assistance in the laboratory. Moreover, we are greatful to G. Gonsior is for the provision of A. aquaticus. The authors acknowledge J. P. Zubrod, B. Leask, and three anonymous reviewers for valuable comments on an earlier draft of this manuscript.
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Bundschuh, M., Appeltauer, A., Dabrunz, A. et al. Combined Effect of Invertebrate Predation and Sublethal Pesticide Exposure on the Behavior and Survival of Asellus aquaticus (Crustacea; Isopoda). Arch Environ Contam Toxicol 63, 77–85 (2012). https://doi.org/10.1007/s00244-011-9743-2
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DOI: https://doi.org/10.1007/s00244-011-9743-2