Ecological effects of Spring and late Summer applications of Lambda-Cyhalothrin on freshwater microcosms

R.P.A. van Wijngaarden, T.C.M. Brock, P.J. van den Brink, R. Gylstra, S.J. Maund

Research output: Contribution to journalArticleAcademicpeer-review

34 Citations (Scopus)

Abstract

The aim of the study was to compare the effects of the pyrethroid insecticide lambda-cyhalothrin (treated at 10, 25, 50, 100, 250 ng active ingredient a.i./L) on a drainage ditch ecosystem in spring and late summer. Microcosms (water volume approximately 430 L) were established using enclosures in a 50-cm¿deep experimental ditch system containing communities typical of macrophyte-dominated freshwater ecosystems. Effects on macroinvertebrates, zooplankton, phytoplankton, macrophytes, and community metabolism were assessed and evaluated using univariate and multivariate statistical techniques. The macroinvertebrate community responded most clearly to treatment and, as anticipated, insects and crustaceans were among the most sensitive organisms. Statistical analysis showed that the underlying community structure was significantly different between the spring and summer experiments. However, the most sensitive species (Chaoborus obscuripes and Gammarus pulex) were abundant in spring as well as in late summer. In spring and late summer, only slight and transient effects were observed at the community level in the 10-ng/L treatment. Overall, the study did not show substantial differences in the responses of sensitive taxa between spring and late summer treatments, and effects thresholds were similar irrespective of season of treatment.
Original languageEnglish
Pages (from-to)220-239
JournalArchives of Environmental Contamination and Toxicology
Volume50
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • toxicity
  • freshwater ecology
  • lambda-cyhalothrin
  • seasons
  • spring
  • summer
  • surface water
  • ditches
  • active ingredient chlorpyrifos
  • insecticide dursban(r) 4e
  • aquatic risk-assessment
  • community responses
  • fate
  • zooplankton
  • organisms
  • mesocosms
  • recovery

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