Assessment of nonpoint-source runoff in a stream using in situ and laboratory approaches

Anthropogenic activities that change a watershed can cause adverse impacts to receiving water. Agricultural and urban runoff are the two leading causes of surface-water impairment in the United States. When assessing pollutant sources and their effects on aquatic ecosystems, and prior to implementin...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 1999-12, Vol.18 (12), p.2797-2803
Main Authors: Tucker, Kathryn A., Jr, G. Allen Burton
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chironomidae
Chironomus tentans
Ecotoxicology, biological effects of pollution
Fresh water environment
Fundamental and applied biological sciences. Psychology
Habitat
Hyalella azteca
In situ
Invertebrate
Nonpoint source
Toxicity
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Summary:Anthropogenic activities that change a watershed can cause adverse impacts to receiving water. Agricultural and urban runoff are the two leading causes of surface-water impairment in the United States. When assessing pollutant sources and their effects on aquatic ecosystems, and prior to implementing source controls, it is necessary to define the systems stressors and receptors of exposure. Toxicity assays are a key component to integrative assessments that include habitat (physical), chemical, and indigenous community characterization. Traditional toxicity assay methods and the use of water-quality criteria are often inappropriate because of exposure design and effect assumptions. Hyalella azteca and Chironomus tentans were exposed in situ for varying time periods during both low- and high-flow conditions to determine the effect of urban and agricultural runoff. Short-term chronic and acute toxicity of urban and agricultural runoff was then measured in the laboratory and related to in situ test results. Nonpoint-source (NPS) runoff from urban areas was often more acutely toxic to organisms in the laboratory as compared to in situ results. Conversely, toxicity to the organisms was greater at the agricultural site during in situ exposures when compared to laboratory. In situ assays were an essential and integral component of NPS runoff assessments. They provided unique information that complemented laboratory toxicity, habitat, benthic community, and physicochemcial characterizations.
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5620181221