2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 10:00 AM - 10:15 AM | DO HYDROLOGIC DISTURBANCES EXACERBATE OR MITIGATE THE EFFECTS OF CONTAMINANTS IN URBAN STREAMS? | 305B
DO HYDROLOGIC DISTURBANCES EXACERBATE OR MITIGATE THE EFFECTS OF CONTAMINANTS IN URBAN STREAMS?
Frequent flooding due to catchment urbanization tends to reduce the productivity and biomass of biofilms in urban streams, and may alter their ability to assimilate and transform contaminants. Understanding of how the timing of contaminant exposure (i.e. salt, pharmaceuticals, metals) may independently alter the recovery of biofilms between storms is limited. We conducted an artificial stream experiment in which treatment streams underwent a simulated storm. We then dosed streams with a chemical mixture mimicking a highly contaminated stream in Baltimore, MD in a pulse at different stages of biofilm recovery (1, 7, and 14 days post-storm). We did not observe changes in whole-stream gross primary productivity (P) relative to the control based on exposure timing. However, cumulative whole-stream respiration (R) was reduced by 47% in streams that received contaminant pulses, raising the P/R ratio of impacted streams. A week after exposure, nitrate uptake rates were 76% higher relative to the control in only the earliest exposure treatments. To understand the mechanisms underlying these changes in process rates, we calculated rates of contaminant bioaccumulation and investigated the composition of biofilm communities.
- C08 Urban Ecology
- C13 Ecotoxicology
- S03 Stressing the 'Eco' in Freshwater Ecotoxicology
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Presenters/Authors
Joanna Blaszczak
(), Global Water Center and Department of Natural Resources and Environmental Science, University of Nevada, Reno, jblaszczak@unr.edu;
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Jennifer Rocca
(), Duke University, jenny.rocca@gmail.com;
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Emma Rosi
(), Cary Institute of Ecosystem Studies, rosie@caryinstitute.org;
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Emily Bernhardt
(), Duke University, ebernhar@duke.edu;
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