ESS Wed Seminar: Possible Extreme Persistence Mechanisms of Uncultured Phyla in Marine Sediment BY Professor Karen Lloyd, University of Tennessee

Wednesday, May 23, 2018

12:30 pm

Y2E2, Room #111 Map

Sponsored by:
Department of Earth System Science

It is impossible to accurately quantify the abundance of different taxonomic groups across all Earth environments. However, we approximated this by determining the distance of all 16S rRNA gene sequences in public databases to their nearest cultured relative. We found that uncultured organisms, and in particular uncultured phyla are highly abundant in all Earth environments, except the human body, where uncultured microbes are only novel at the family level or lower. In order to determine the functions of these uncultured microbes in marine sediments, we examined environmental metabolites, single cell genomes, metatranscriptomes, and environmental enzyme activity measurements to assess their functions. These communities are capable of persisting for thousands of years with little growth. We identified mechanisms that may allow them to achieve this feat, and suggest that, although the total cell numbers decrease over time, these organisms are catabolically active and fill different ecological niches that distinguish them from better-studied high-energy ecological communities.

Wednesday, May 23, 2018
12:30 pm – 1:20 pm
Y2E2, Room #111 Map

Environment Seminar Science 

Faculty/Staff, Students
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