Concentrations of pesticides in multiple matrices to measure exposure of wild bees visiting pollinator hedgerows in northern California

Dates

Publication Date: 2022-01-21
Start Date: 2016-03-07
End Date: 2016-06-28

Citation

Hladik, M.L., and Ward, L.T., 2022, Concentrations of pesticides in multiple matrices to measure exposure of wild bees visiting pollinator hedgerows in northern California: U.S. Geological Survey data release, https://doi.org/10.5066/P9S8TRLX.

Summary

To better understand the exposure of wild bees to pesticides in an agricultural landscape, samples were collected from fields in northern California. Hedgerows are known to provide habitat for wild bees, but these bees may also be exposed to pesticides from nearby agricultural fields. The study included eight hedgerow sites located in an intensively managed agricultural landscape that includes almonds, (wine) grapes, rice, tomatoes, and walnuts. In addition to collecting both wild bees and honey bees, soil, flowers, and silicone passive sampling devices (PSD; staked near the hedgerows to sample the air) were also included. Sampling was conducted from April to June 2016, to coincide with peak bloom and bee activity for comparison with [...]

Summary

To better understand the exposure of wild bees to pesticides in an agricultural landscape, samples were collected from fields in northern California. Hedgerows are known to provide habitat for wild bees, but these bees may also be exposed to pesticides from nearby agricultural fields. The study included eight hedgerow sites located in an intensively managed agricultural landscape that includes almonds, (wine) grapes, rice, tomatoes, and walnuts. In addition to collecting both wild bees and honey bees, soil, flowers, and silicone passive sampling devices (PSD; staked near the hedgerows to sample the air) were also included. Sampling was conducted from April to June 2016, to coincide with peak bloom and bee activity for comparison with pesticide use records from the surrounding landscape. PSDs were extracted via sonication with an organic solvent while the other matrices (soil, flowers, bees) were extracted via pressurized liquid extraction and solid phase extraction cleanup. Samples were analyzed for 168 pesticides and degradates using both gas and liquid chromatography-tandem mass spectrometry. Overall, 38 pesticides were detected in all matrices (10 insecticides and degradates, 12 fungicides, 15 herbicides and degradates, and 1 plant growth regulator). The number and type of pesticides detected varied by matrix; 24 compounds were detected in the PSDs, 24 in soil, 15 in flowers, 18 in native bees, and 10 in honeybees. These results can help determine which matrices are best at estimating wild bee pesticide exposure and which pesticides should be targeted for future effects work.

Contacts

Point of Contact :: Michelle L Hladik
Process Contact :: Michelle L Hladik
Originator :: Michelle L Hladik, Laura T. Ward
Metadata Contact :: Michelle L Hladik
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase
USGS Mission Area :: Water Resources
SDC Data Owner :: California Water Science Center

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Pesticides in pollinator hedgerows metadata.xml Original FGDC Metadata	View	85.82 KB	application/fgdc+xml
Floral tissue and bees.jpg “Photos of flower and bee samples”		80.23 KB	image/jpeg
Hedgerow pesticides compounds.csv “Compounds Analyzed”		9.36 KB	text/csv
Hedgerow pesticides passive samplers.csv “Pesticides in Passive Samplers”		3.14 KB	text/csv
Hedgerow pesticides soil.csv “Pesticides in Soil”		2.28 KB	text/csv
Hedgerow pesticides flowers.csv “Pesticides in Flowers”		6.07 KB	text/csv
Hedgerow pesticides bees by mass.csv “Pesticides in Bees by Mass”		6.17 KB	text/csv
Hedgerow pesticides bees by number.csv “Pesticides in Bees by Number”		4.68 KB	text/csv

Related External Resources

Type: Related Primary Publication

Ward, L.T., Hladik, M.L., Guzman, A., Winsemius, S., Bautista, A., Kremen, C., Mills, N.J., 2022, Pesticide exposure of wild bees and honey bees foraging from field border flowers in intensively managed agriculture areas, Sci. Total Environ., v. 831, pp. 154697 https://doi.org/10.1016/j.scitotenv.2022.154697	https://doi.org/10.1016/j.scitotenv.2022.154697

Purpose

Data were collected to better understand the pesticide exposure of wild bees and honey bees visiting agricultural lands with pollinator planting. Passive samplers (to collect aerial spraying to atmospheric deposition), flowers, soil, and bees were collected and analyzed for pesticides.

Concentrations of pesticides in multiple matrices to measure exposure of wild bees visiting pollinator hedgerows in northern California

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