Temporal and spatial trends in sediment contaminants associated with toxicity in California watersheds
| Autor: | Bryn M. Phillips, Ronald S. Tjeerdema, Katie Siegler, Jennifer P. Voorhees, Brian S. Anderson |
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| Rok vydání: | 2015 |
| Předmět: |
Pollution
Geologic Sediments Health Toxicology and Mutagenesis media_common.quotation_subject Bifenthrin Toxicology California chemistry.chemical_compound Rivers Pyrethrins parasitic diseases Animals Amphipoda Pesticides media_common Pyrethroid biology Hyalella azteca Sediment General Medicine Pesticide biology.organism_classification chemistry Environmental chemistry Toxicity Environmental science Seasons Water quality Water Pollutants Chemical |
| Zdroj: | Environmental Pollution. 206:1-6 |
| ISSN: | 0269-7491 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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