Temporal and spatial trends in sediment contaminants associated with toxicity in California watersheds

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Siegler, K., Phillips, B. M., Anderson, B. S., Voorhees, J. P., & Tjeerdema, R. S. (2015). Temporal and spatial trends in sediment contaminants associated with toxicity in California watersheds. Environmental Pollution, 206, 1-6. Retrieved from http://www.sciencedirect.com/science/article/pii/S0269749115003218
Metadata
TitleTemporal and spatial trends in sediment contaminants associated with toxicity in California watersheds
AuthorsK. Siegler, B. Phillips, B. Anderson, J. Voorhees, R. Tjeerdema
AbstractAbstract California's Stream Pollution Trends program (SPoT) assesses long-term water quality trends, using 100 base-of-the-watershed sampling sites. Annual statewide sediment surveys from 2008 to 2012 identified consistent levels of statewide toxicity (19%), using the freshwater amphipod Hyalella azteca. Significant contaminant trends included a decrease in PCBs, stable concentrations of metals and PAHs, and a statewide increase in detections and concentrations of pyrethroid pesticides. The pyrethroid pesticide bifenthrin was detected in 69% of samples (n = 410). Detection of toxicity increased in a subset of samples tested at a more environmentally relevant test temperature (15 °C), and the magnitude of toxicity was much greater, indicating pyrethroid pesticides as a probable cause. Pyrethroid toxicity thresholds (LC50) were exceeded in 83% of samples with high toxicity. Principal components analysis related pyrethroids, metals and total organic carbon to urban land use.
JournalEnvironmental Pollution
Date2015-11
Volume206
Start page1
End page6
ISSN0269-7491
SubjectsToxicity, Spatial–temporal, Pyrethroids, California, Sediment

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