Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca)

John M. Brausch, Philip N. Smith

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Extensive pesticide usage in modern agriculture represents a considerable anthropogenic stressor to freshwater ecosystems throughout the United States. Acute toxicity of three of the most commonly used agricultural pesticides (Methyl Parathion® 4ec, Tempo® SC Ultra, Karmex® DF, and DDT) was determined in two different wild-caught strains of the fairy shrimp Thamnocephalus platyurus. Fairy shrimp collected from playas surrounded by native grasslands were between 200% and 400% more sensitive than fairy shrimp derived from playas in agricultural watersheds for Methyl Parathion® 4ec, Tempo® SC Ultra, and Karmex® DF, likely due to the development of resistance. Additionally, reduced sensitivity to DDT was observed among fairy shrimp from agriculturally-impacted playas as compared to those from native grassland-dominated playas. These data suggest that fairy shrimp inhabiting playas in agricultural regions have developed some degree of resistance to a variety of agrochemicals in response to historical usage.

Original languageEnglish
Pages (from-to)481-487
Number of pages7
JournalEnvironmental Pollution
Volume157
Issue number2
DOIs
StatePublished - Feb 1 2009

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Keywords

  • Agrochemicals
  • Fairy shrimp
  • Pesticides
  • Resistance
  • Thamnocephalus platyurus

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