2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 2:30 PM - 2:45 PM | IS IT ALL ABOUT THE SLIME? UNDERSTANDING DENITRIFICATION AND PHARMACEUTICAL DYNAMICS IN WATER CHESTNUT (TRAPA) BEDS | 151 ABC

IS IT ALL ABOUT THE SLIME? UNDERSTANDING DENITRIFICATION AND PHARMACEUTICAL DYNAMICS IN WATER CHESTNUT (TRAPA) BEDS

Pharmaceuticals have been detected in freshwater systems world-wide. Intrinsically biologically active, pharmaceuticals have the potential to act on non-target organisms at sub-lethal concentrations, including microbes that provide important ecosystem services. Shallow backwaters along the edge of the Hudson River (NY), a tidal freshwater river system, are densely vegetated with the invasive floating macrophyte Trapa natans. Trapa beds play an integral role in the Hudson River’s ecology due to their considerable capacity for denitrification, a microbially-mediated process that is vital for reducing eutrophication and harmful algal blooms. This study examines how several commonly used pharmaceuticals affect denitrifying microbial communities within the water column, root biofilm and sediment of Trapa beds. Pharmaceutical diffusing substrates (PhaDS) were used to expose biofilm microbial communities to an antibiotic (ciprofloxacin), an antidiabetic (metformin), and a histamine-2 blocker (ranitidine). Denitrification rates were measured as dinitrogen production using Membrane Inlet Mass Spectrometry, and microbial community structure was assessed with 16S profiling and whole genome metagenomics.

Bacteria
Nitrogen
Biogeochemistry

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Presenters/Authors

Cami Plum (), Monash University, cami.plum@monash.edu;