Toxicity of environmentally realistic concentrations of chlorpyrifos and terbuthylazine in indoor microcosms

Ana Santos Pereira, Maria José Cerejeira, Michiel A. Daam

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Few studies have been conducted into the evaluation of environmentally realistic pesticide mixtures using model ecosystems. In the present study, the effects of single and combined environmentally realistic concentrations of the herbicide terbuthylazine and the insecticide chlorpyrifos were evaluated using laboratory microcosms. Direct toxic effects of chlorpyrifos were noted on copepod nauplii and cladocerans and the recovery of the latter was likely related with the decrease observed in rotifer abundances. Terbuthylazine potentiated the effect of chlorpyrifos on feeding rates of Daphnia magna, presumably by triggering the transformation of chlorpyrifos to more toxic oxon-analogs. Possible food-web interactions resulting from multiple chemical (and other) stressors likely to be present in edge-of-field water bodies need to be further evaluated.

Original languageEnglish
Pages (from-to)348-355
Number of pages8
JournalChemosphere
Volume182
DOIs
Publication statusPublished - 2017

Keywords

  • Ecological risk assessment
  • Food web interactions
  • Mixture toxicity
  • Model ecosystems
  • Pesticides
  • Zooplankton

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