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Direct and indirect effects of the fungicide azoxystrobin in outdoor brackish water microcosms
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
Department of Ecology and Evolution/Limnology, Uppsala University.
Department of Aquatic Science and Assessment, Swedish University of Agricultural Sciences.
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2010 (English)In: Ecotoxicology, ISSN 0963-9292, E-ISSN 1573-3017, Vol. 19, no 2, 431-444 p.Article in journal (Refereed) Published
Abstract [en]

The effects of the strobilurin fungicide azoxystrobin were studied in brackish water microcosms, with natural plankton communities and sediment. Two experiments were conducted: Experiment 1 (nominal conc. 0, 15 and 60 μg/L, 24-L outdoor microcosms for 21 days) and a second, follow-up, Experiment 2 (nominal conc. 0, 3, 7.5, 15 μg/L, 4-L indoor microcosms for 12 days). The microcosms represent a simplified brackish water community found in shallow semi-enclosed coastal areas in agricultural districts in the Baltic Sea region. Measured water concentrations of the fungicide (Experiment 1) were, on average, 83 and 62% of nominal concentrations directly after application, and 25 and 30% after 21 days, for the low and high dose treatments, respectively, corresponding to mean DT50-values of 15.1 and 25.8 days, for low and high dose treatments, respectively. In Experiment 1, direct toxic effects on calanoid copepods at both test concentrations were observed. Similarly, in Experiment 2, the copepod abundance was significantly reduced at all tested concentrations. There were also significant secondary effects on zooplankton and phytoplankton community structure, standing stocks and primary production. Very few ecotoxicological studies have investigated effects of plant protection products on Baltic organisms in general and effects on community structure and function specifically. Our results show that azoxystrobin is toxic to brackish water copepods at considerably lower concentrations than previously reported from single species tests on freshwater crustaceans, and that direct toxic effects on this ecologically important group may lead to cascade effects altering lower food webs and ecosystem functioning.

Place, publisher, year, edition, pages
2010. Vol. 19, no 2, 431-444 p.
Keyword [en]
Baltic Sea; Strobilurin fungicides; Copepoda; Indirect effects; Model ecosystems; Toxicity
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URN: urn:nbn:se:su:diva-32847DOI: 10.1007/s10646-009-0428-9ISI: 000273979000019OAI: diva2:281785
authorCount :6Available from: 2009-12-17 Created: 2009-12-17 Last updated: 2011-01-13Bibliographically approved

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