2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:00 PM - 2:15 PM | GOING WITH THE FLOW: SPATIAL AND TEMPORAL TRENDS IN STREAM MICROBIAL COMMUNITY STRUCTURE AND FUNCTION | 151 G
GOING WITH THE FLOW: SPATIAL AND TEMPORAL TRENDS IN STREAM MICROBIAL COMMUNITY STRUCTURE AND FUNCTION
Microbes play key roles in shaping stream nutrient cycles and food webs. Similar to the macrobiota, stream microbial communities are shaped by both geomorphology and ecological interactions. However, how these processes interact to drive community changes over space and time remains poorly understood. We have conducted a five-year study of microbial community composition across the Upper Oconee Watershed near Athens, GA. We have found strong, replicable longitudinal trends in microbial community composition across the watershed, with alpha and beta diversity both decreasing with downstream movement through the stream network. This decrease in diversity is accompanied by consistent enrichment of a small subset of microbial taxa, with the same microbes being enriched across large stream networks and over long periods of time. The end result of these processes are highly diverse and variable upstream microbial communities, and progressively greater temporal and spatial stability in community composition as you move downstream. Studies of stream microbial metagenomes show that these taxonomic diversity trends are associated with downstream decreases in microbial metabolic diversity, suggesting that position within the River Continuum plays a key role in shaping microbial community structure and function.
- Metagenomics
- Biodiversity
- Bacteria
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Presenters/Authors
Elizabeth Ottesen
(), University of Georgia, ottesen@uga.edu;
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