The effects of a pesticide mixture on aquatic ecosystems differing in trophic status: responses of the macrophyte Myriophyllum spicatum and the periphytic algal community

L. Wendt-Rasch, P.J. van den Brink, S.J.H. Crum, P. Woin

Research output: Contribution to journalArticleAcademicpeer-review

32 Citations (Scopus)

Abstract

The effects of a pesticide mixture (asulam, fluazinam, lambda-cyhalothrin, and metamitron) on aquatic ecosystems were investigated in 20 outdoor aquatic microcosms. Ten of the microcosms simulated mesotrophic aquatic ecosystems dominated by submerged macrophytes (Elodea). The others simulated eutrophic ecosystems with a high Lemna surface coverage (Lemna). This paper describes the fate of the chemicals as well as their effects on the growth of Myriophyllum spicatum and the periphytic algal community. In the Elodea-dominated microcosms significant increase in the biomass and alterations of species composition of the periphytic algae were observed, but no effect on M. spicatum growth could be recorded in response to the treatment. The opposite was found in the Lemna-dominated microcosms, in which decreased growth of M. spicatum was observed but no alterations could be found in the periphytic community. In the Elodea-dominated microcosms the species composition of the periphytic algae diverged from that of the control following treatment with 0.5% spray drift emission of the label-recommended rate (5% for lambda-cyhalothrin), while reduced growth of M. spicatum in the Lemna-dominated microcosms was recorded at 2% drift (20% for lambda-cyhalothrin). This study shows that the structure of the ecosystem influences the final effect of pesticide exposure.
Original languageEnglish
Pages (from-to)383-398
JournalEcotoxicology and Environmental Safety
Volume57
Issue number3
DOIs
Publication statusPublished - 2004

Keywords

  • aquatic environment
  • aquatic plants
  • aquatic weeds
  • asulam
  • herbicide mixtures
  • lambda-cyhalothrin
  • metamitron
  • nontarget effects
  • nontarget organisms
  • pesticide residues
  • trophic levels
  • weeds
  • fresh-water microcosms
  • insecticide dursban(r) 4e
  • phytoplankton succession
  • pyrethroid insecticides
  • fungicide carbendazim
  • phosphorus release
  • final conclusions
  • primary producers
  • model-ecosystems
  • zooplankton

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