Host-parasite relationships in anthropogenically affected environments

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Parasites are widespread in the environment and are an integral part of natural ecosystems. They can have pronounced or subtle effects on their hosts affecting biochemical, physiological, morphological, and behavioural host traits. Parasites however, are also capable of accumulating pollutants in considerable amounts and thus reduce the negative impact of toxicants on the host. In environmental studies, parasites and their influence on infected individuals and populations are recognized, yet often overlooked, and host responses are often interpreted solely as a result of exposure to environmental pollutants. Overall, the proposed research program focuses on effects of selenium contamination on host-parasite interactions in aquatic systems. Through laboratory experiments the proposed research program will investigate combined effects of parasitism and selenium pollution on survival, swimming performance, energetics, and blood chemistry of fathead minnow (Pimephales promelas) and walleye (Sander vitreus). Dynamics of metal accumulation, distribution, and speciation in adult parasites (tapeworms) will be studied by means of mass spectrometry (ICP-MS) and synchrotron technology (x-ray absorption spectroscopy.)