2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | Ten years later, how well has the U.S. EPA’s field-based method for conductivity held up? | Virtual Platform
Ten years later, how well has the U.S. EPA’s field-based method for conductivity held up?
How well has the 2011 U.S. EPA’s field-based method for deriving aquatic life benchmarks for conductivity held up over time? To find out, we examined the assumptions and discriminatory power of genus and community level effects. For genus level effects, we assessed confidence of the response of individual genera, number of occurrences needed for estimating effects, and influence of common and uncommon taxa. For community level effects, we assessed the ability of data sets to estimate the effect level by removing potential confounders such as seasonal influences, and we assessed the discriminatory power of the data set by making genus a random variable in permutation tests. We also critically examined independent studies of specific biological responses and quantitative results in different places with different approaches. On the bases of these analyses, the field-based method works well and can provide a reliable representation of the effects of increased ion concentrations on invertebrates in regions with low natural mineral content. Furthermore, more than ten years of scrutiny and challenges and subsequent research have made the science better and provided additional methods for using field observational data.
- Biological effects
- Stream
- Models
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Presenters/Authors
Susan Cormier
(), U.S. Environmental Protection Agency, cormier.susan@epa.gov;
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Mark Fernandez
(), TetraTech, Inc., mark.fernandez@tetratech.com;
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Glenn Suter
(), retired from U.S. Environmental Protection Agency, suterpro@earthlink.net;
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Lei Zheng
(), previously with Tetra Tech, Inc., lei.zheng@hotmail.com;
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