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Effects of the pesticides captan, deltamethrin, isoproturon, and pirimicarb on the microbial community of a freshwater sediment
Department of Environmental Assessment, Swedish University of Agricultural Sciences, P.O. Box 7050, SE-750 07 Uppsala, Sweden.
Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
Department of Environmental Assessment, Swedish University of Agricultural Sciences, P.O. Box 7050, SE-750 07 Uppsala, Sweden.
2004 (English)In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 23, no 8, p. 1920-1927Article in journal (Refereed) Published
Abstract [en]

In three microcosm experiments, we exposed microbial communities of a natural sediment to environmentally relevant concentrations of the fungicide captan, the herbicide isoproturon, and the insecticides deltamethrin and pirimicarb. Exposure concentrations were estimated negligible concentrations (NCs), maximum permissible concentrations (MPCs), and 100 times MPC (100MPC). Experimental endpoints were microbial community respiration and biomass, bacterial activity, and denitrification. All four pesticides inhibited bacterial activity by 20 to 24% at MPC, which corresponded to concentrations in the range of μg/kg dry-weight sediment. Treatments with deltamethrin and isoproturon showed inhibiting effects on bacterial activity at NC exposures. Surprisingly, for captan, deltamethrin, and isoproturon, this inhibiting effect was not observed at 100MPC treatments. Microbial biomass was negatively effected in MPC treatments with deltamethrin and in NC treatments with isoproturon. The tested pesticides did not affect community respiration and denitrification rates. These results show that exposure to the tested pesticides may induce toxic responses in sediment microbial communities at concentrations that are predicted to be environmentally safe.

Place, publisher, year, edition, pages
Hoboken: John Wiley & Sons, 2004. Vol. 23, no 8, p. 1920-1927
Keywords [en]
Pesticides, Microbial communities, Natural sediment, Bacterial activity, Denitrification
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-326DOI: 10.1897/03-345ISI: 000222740400015Scopus ID: 2-s2.0-3442883334Local ID: 2082/628OAI: oai:DiVA.org:hh-326DiVA, id: diva2:237505
Available from: 2006-12-13 Created: 2006-12-13 Last updated: 2017-12-13Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • ieee
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