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Current aquatic environmental risk assessment of plant protection products or biocides does not consider effects on organisms involved in leaf litter breakdown, a fundamental ecosystem process in streams. Therefore, direct ecotoxicological implications of tebuconazole, a frequently used triazole fungicide, on the leaf-shredding amphipod Gammarus fossarum, were assessed. While acute toxicity was low (96h-LC(50) = 1347 mu g/L), feeding rate, a sublethal endpoint, was significantly reduced after...Current aquatic environmental risk assessment of plant protection products or biocides does not consider effects on organisms involved in leaf litter breakdown, a fundamental ecosystem process in streams. Therefore, direct ecotoxicological implications of tebuconazole, a frequently used triazole fungicide, on the leaf-shredding amphipod Gammarus fossarum, were assessed. While acute toxicity was low (96h-LC(50) = 1347 mu g/L), feeding rate, a sublethal endpoint, was significantly reduced after seven days of exposure to 600 mu g/L. At the same concentration, but during a three week exposure under semi-static conditions, gammarids showed significant reductions in feeding, but also in assimilation and growth. At 200 mu g/L, however, only assimilation was significantly affected. As these endpoints can be used to evaluate the ecotoxicity of a broad range of chemicals and to deduce possible implications in the functioning of ecosystems, the inclusion of similar experimental set-ups might further improve aquatic environmental risk assessment. (C) 2010 Elsevier Inc. All rights reserved. » weiterlesen» einklappen

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