2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2018 | 10:15 AM - 10:30 AM | ENVIRONMENTAL FACTORS AFFECTING BACTERIAL COMMUNITY COMPOSITION IN THE HYPEREUTROPHIC MACATAWA WATERSHED | 420 B

ENVIRONMENTAL FACTORS AFFECTING BACTERIAL COMMUNITY COMPOSITION IN THE HYPEREUTROPHIC MACATAWA WATERSHED

Project Clarity works to mitigate the impact of urbanization and agricultural activity in the Macatawa Watershed, including high sediment, nutrient and fecal coliform loading. We are assessing project impact on water quality in order to aid decisions about public access to recreational waters and mitigation strategies. Weekly samples over the course of a 1 year period from 12 representative sites were analyzed for biological (e.g., community 16S rRNA sequencing, fecal indicator bacteria, Escherichia coli genome sequencing), chemical (e.g., DO/BOD, nutrients), and physical parameters (e.g., temperature, pH). Results indicate continued high phosphorous, total suspended solids, and E. coli levels, exceeding total maximum daily load targets for the watershed. Patterns in microbial communities show variation influenced by season and geographical location (e.g., stream or lake location). Rain events impact the communities to a lesser degree. Diversity of microbial communities increases in late fall and winter. Identification of microbial taxa acting as signatures of environmental conditions could lead to new methods of monitoring water quality. These data provide a baseline for monitoring remediation efforts in the Macatawa Watershed and may serve as a comparison for hypereutrophic watersheds around the nation.

Monitoring
Bacteria
Watershed

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Presenters/Authors

Aaron Best (), Hope College, best@hope.edu;