Methamidophos application effects on Pasimachus elongatus (Coleoptera: Carabidae): an update

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Population densities of the predatory ground beetle, P. elongatus, were examined at the Central Plains Experimental Range, Colorado. Using distance sampling theory, density estimates dating from before an application of the insecticide methamidophos (1988) and three beetle generations afterward (1994) were analyzed. Higher population densities were found in shrub dominated than in grass dominated sites, regardless of past methamidophos exposure. The P. elongatus density patterns seen are discussed in relation to possible long-term disruption of the arthropod prey community by metyhamidophos and in relation to competitive release and physiological resistance. -from Author

Original languageEnglish
Pages (from-to)559-563
Number of pages5
JournalEnvironmental Entomology
Issue number3
StatePublished - 1995


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