2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 3:15 PM - 3:30 PM | ASSESSING MULTIPLE STRESSORS ON STREAM DIATOM METRICS IN THE UPPER MIDWEST, USA | 302C
ASSESSING MULTIPLE STRESSORS ON STREAM DIATOM METRICS IN THE UPPER MIDWEST, USA
This study assessed the influence of physical and chemical stressors on benthic diatoms in the upper Midwest, USA. The dominant stressors of interest included nutrients, herbicides, sediment, and streamflow. Habitat, chemistry and benthic diatoms were assessed at 98 sites that spanned a range of agricultural land use intensity. Boosted Regression Tree was used to examine the importance of stressors on diatom metrics. Results indicated that percent sensitive taxa, percent highly motile taxa, and percent high phosphorus taxa were the diatom metrics with the strongest model performance. For all sites combined, physical habitat and total phosphorus were the best explanatory variables; however, when sites were partitioned into fine and coarse-grain dominated streams, herbicides increased in importance in both stream types. A Classification and Regression Tree model indicated that percent sensitive taxa decreased in streams dominated by fine-grain substrate when water temperatures were over 30 C and triazine concentrations exceeded 1500 ng/L. In contrast, streams dominated by coarse-grain substrate had a higher percentage of sensitive taxa when water temperatures were below 29 C and streams were less than 0.3 meters deep.
- C01 Algae
- C22 Disturbance
- S31 Moving forward in flow ecology: identifying and testing key hypotheses & C17 Bioassessment
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Presenters/Authors
Mark Munn
(), U.S. Geological Survey, Tacoma, WA, mdmunn@usgs.gov;
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Ian Waite
(), U.S. Geological Survey, Portland, OR, iwaite@usgs.gov;
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Christopher Konrad
(), US Geological Survey, cpkonrad@usgs.gov;
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