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193297 
Journal Article 
Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca) 
Brausch, JM; Smith, PN 
2009 
Yes 
Environmental Pollution
ISSN: 0269-7491
EISSN: 1873-6424 
157 
2 
481-487 
English 
18977573 
WOS:000262971900018 
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 (R) 4ec, Tempo (R) SC Ultra, Karmex (R) 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 (R) 4ec, Tempo (R) SC Ultra, and Karmex (R) 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. (c) Published by Elsevier Ltd.