The objectives of this study were to measure benthic community conditions, physical habitat, basic water quality parameters, pyrethroids, sediment total organic carbon, grain size, and metals annually in two urban California streams (Arcade Creek and Salinas streams) from 2009 to 2011. Univariate and stepwise multiple regression techniques were used to determine the relationship between 14 benthic community metrics and physical habitat, pyrethroids, and metals. Tolerant benthic taxa, poor habitat, and potentially toxic metals and pyrethroids were reported in both study areas, but were more apparent in Salinas streams. Analysis of the three year data sets for Arcade Creek showed more significant and consistent relationships with benthic metrics and habitat metrics than with metals or pyrethroids. The three year data sets for Salinas streams showed that habitat, and not metals or pyrethroids, was the only stressor to show a significant relationship with benthic metrics.

Assessment of the potential influence of physical habitat, pyrethroids, and metals on benthic communities in urban California streams in 2009-2011

244th National Meeting (2012)

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