2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 8:30 AM - 10:30 AM | GLYPHOSATE EXPOSURE IMPACTS ON BENTHIC SEDIMENT MICROBIAL COMMUNITIES: A MICROCOSM EXPERIMENT IN THE NORTHERN GREAT PLAINS | Virtual Platform
GLYPHOSATE EXPOSURE IMPACTS ON BENTHIC SEDIMENT MICROBIAL COMMUNITIES: A MICROCOSM EXPERIMENT IN THE NORTHERN GREAT PLAINS
Increasing herbicide use frequently leads to contamination of aquatic ecosystems via spray drift, runoff, or groundwater transport. Glyphosate is the most commonly used herbicide worldwide and is widely distributed in wetland waters and sediments. Wetland sediments often serve as sinks where glyphosate and its metabolite aminomethylphosphonic acid (AMPA) can accumulate, leaving the benthic microbiome vulnerable to direct or indirect effects. Research suggests that exposure to glyphosate causes shifts in community composition or function by either inhibiting species growth and reproduction, or enhancing microbial communities by providing a novel phosphorus, nitrogen, and carbon source. We conducted a replicated microcosm experiment to assess how benthic sediment microbiomes respond to exposure of glyphosate, AMPA, or a glyphosate-based formula. Sediments were collected from a wetland with no immediate adjacent agricultural activity. Additionally, no glyphosate or AMPA residues were detected prior to the start of the experiment. Herbicides were added at 0.07, 0.7, or 7 ppm and sediment was collected pre-treatment, two hours post-treatment, and two weeks post-treatment for herbicide and microbial analyses. Preliminary results show no significant differences in microbial community composition between treatments, which could suggest an adapted resistance to the ubiquitous compound.
- Contaminants
- Genomics
- Biogeochemistry
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Presenters/Authors
Christine Cornish
(), North Dakota State University, christine.cornish@ndsu.edu;
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Peter Bergholz
(), North Dakota State University, peter.bergholz@ndus.edu;
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Kaycie Schmidt
(), North Dakota State University, kaycie.schmidt@ndsu.edu;
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Jon Sweetman
(), Environmental and Conservation Sciences Program and Department of Biological Sciences, North Dakota State University, sweetman.jon@ndsu.edu;
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