2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | AN ASSESSMENT OF THE SALINIZATION OF U.S. LAKES AND STREAMS FROM PROBABILITY SURVEY DATA | Virtual Platform
AN ASSESSMENT OF THE SALINIZATION OF U.S. LAKES AND STREAMS FROM PROBABILITY SURVEY DATA
The U.S. EPA began the NARS (National Aquatic Resource Surveys) program in 2000 to quantify the status and extent of ecological condition in the Nation’s aquatic resources and to track the changes in these conditions over time. As part of NARS, lakes, streams, and rivers have been sampled using a probabilistic design on a five-year cycle across the conterminous U.S. so that quantitative estimates of the entire population can be made. In recent surveys, 84% of the lakes and 82% of the stream/river length were freshwater using a threshold of <500 ppm salt (conductivity ~700 uS). At the other end of the spectrum, 4% of lakes and 2% of stream/river length were saline (>2000 ppm Salt). Salinity patterns varied between ecoregions, with no lakes or streams in the Northern Appalachians being saline compared to 48% of the lakes and 22% of the streams being saline in the Northern Plains, the ecoregion with the highest proportion of saline systems. Temporal analysis of the data showed little or no change in spatial salinity patterns across surveys from 2000-2019. Comparisons of ecological condition to background salinity levels will also be discussed.
- Monitoring
- Biological effects
- Stream
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Presenters/Authors
Alan Herlihy
(), Oregon State University, Alan.Herlihy@oregonstate.edu;
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Richard Mitchell
(), U.S. Environmental Protection Agency, mitchell.richard@epa.gov;
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Steven Paulsen
(), US EPA, Pacific Ecological Systems Division, Corvallis, OR, Paulsen.Steve@epa.gov;
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