Refined Processing of Pesticide Use Reports for Use in Data Analysis Conducted by the California Department of Pesticide Regulation’s Air Program

Craig, Kelsey; Vidrio, Edgar; Wofford, P.; Segawa, Randy

doi:10.1021/bk-2018-1283.ch013

Cited by 1 publication

(1 citation statement)

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“…Pesticide use data for urban and nonproduction agricultural uses are reported monthly on a county basis to the CDPR; use data for production agriculture are reported for the day and time of application on a Public Land Survey System (PLSS) 1 square mile section basis. 53 Data on specific crops on which pesticides were used were available only for production agriculture. Use data for January, February, March, and April 2017 were obtained for (a) the 10 most frequently detected pesticides ("top 10") or (b) those pesticides with a concentration in sediment that exceeded a TEB at any site.…”

Section: Site Selection Sample Collection and Ecologicalmentioning

confidence: 99%

Biofilms Provide New Insight into Pesticide Occurrence in Streams and Links to Aquatic Ecological Communities

Mahler

Schmidt

Nowell

et al. 2020

Environ. Sci. Technol.

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Streambed sediment is commonly analyzed to assess occurrence of hydrophobic pesticides and risks to aquatic communities. However, stream biofilms also have the potential to accumulate pesticides and may be consumed by aquatic organisms. To better characterize risks to aquatic life, the U.S. Geological Survey Regional Stream Quality Assessment measured 93 current-use and 3 legacy pesticides in bed sediment and biofilm from 54 small streams in California across a range of land-use settings. On average, 4 times as many current-use pesticides were detected in biofilm at a site (median of 2) as in sediment (median of 0.5). Of 31 current-use pesticides detected, 20 were detected more frequently in biofilm than in sediment and 10 with equal frequency. Pyrethroids as a class were the most potentially toxic to benthic invertebrates, and of the 9 pyrethroids detected, 7 occurred more frequently in biofilm than sediment. We constructed general additive models to investigate relations between pesticides and 6 metrics of benthic community structure. Pesticides in biofilm improved fit in 4 of the 6 models, and pesticides in sediment improved fit in 2. The results indicate that the sampling of stream biofilms can complement bed-sediment sampling by identification of more current-use pesticides present and better estimation of ecological risks.

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Section: Site Selection Sample Collection and Ecologicalmentioning

confidence: 99%