2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | STIMULATORY ROLE OF NUTRIENTS ON THE BREAKDOWN OF ORGANIC MATTER IS MINIMIZED BY LOCAL ENVIRONMENTAL STRESSORS | Virtual Platform
STIMULATORY ROLE OF NUTRIENTS ON THE BREAKDOWN OF ORGANIC MATTER IS MINIMIZED BY LOCAL ENVIRONMENTAL STRESSORS
Nutrients can increase the breakdown rate of organic material in streams, however the power of nutrients to stimulate breakdown becomes less clear when streams become impaired by chemical stressors and vary in watershed size. We examined the effects of water chemistry on the breakdown rate of wood veneers at 30 sites across a range of watershed sizes, nutrients levels, and water chemistries to test the hypothesis that the effects of nutrients on breakdown are observable across diverse insitu conditions. Our study sites ranged from 1st order headwaters streams to an 8th order river, and from biologically intact to severely impaired. Dissolved inorganic nitrogen (DIN) ranged from ~100-2500 µgL-1 and SRP from ~8-35 µgL-1. We found no consistent positive effects of nutrients; rather we found a negative influence of DIN and iron on breakdown rate. Water temperature was the only parameter significantly positively correlated with increased breakdown rate across our range of study sites. Our highest DIN and lowest breakdown rates were observed at sites impacted by acid mine drainage. Our results indicate the local condition can overshadow the stimulatory effects of nutrients on the breakdown rate of organic materials.
- Organic matter
- Stressor
- Nutrients
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Presenters/Authors
James Wood
(), West Liberty University, James.Wood@westliberty.edu;
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Marisa Tordella
(), Weset Liberty University, mntordella@westliberty.edu ;
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Emily Huff
(), West Liberty University, ethuff@westliberty.edu;
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