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Some Like It Hot! Microbial Communities Inhabiting Hydrothermal Systems

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Date(s) - 03/18/2021
6:30 pm - 7:00 pm

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Webinar Speaker: Dr. Jessica Labonté, Assistant Professor, Department of Marine Biology, Texas A&M University at Galveston

Microbes (including bacteria, archaea, and viruses) are ubiquitous on Earth and have been found under conditions where no animal can survive. Microbes known as extremophiles, inhabit extreme environments such as geothermal hot springs with pH < 3, hypersaline environments with a salinity as high as 35%, and environments with extremely low concentrations of nutrients. One factor that can limit life is temperature; There is currently no known microbe that can tolerate temperatures higher than 122 ˚CHydrothermal systems display diverse and unpredictable conditions of extremely high temperatures and acidic pH, offering a range of environments that naturally test the limits of life as we know it. Microbial communities have been found within hydrothermal fluids, microbial mats on basaltic rock and chimneys, as well as within the neutrally buoyant hydrothermal plume, with varying energetic constraints on microbial activity and abundance. Moreover, hydrothermal systems are hypothesized to be the epicenters of the origins of life, making them ideal for studying evolutionary processes. They also display extreme conditions similar to what we could find on other planets.

The environmental conditions at Brothers volcano (study site of IODP Expedition 376 Brothers Arc Flux) provided a perfect setting to test the limits and adaptations of life. Preliminary analyses of the borehole fluids revealed temperatures up to 350˚C, pH as low as 1.8, higher salinity than in the upper water column, and very low concentrations of organic nutrients. My research uses a combination of molecular approaches and cultivation to characterize the microbial communities’ diversity and interactions in hydrothermal systems to understand the life of extremophiles.

Dr. Labonté received her B.S. and M. Sc. from Laval University, and her Ph.D. from the University of British Columbia. She was a post-doctoral researcher at Bigelow Laboratory before heading to Texas A&M University at Galveston, where she currently is an Assistant Professor. Her research focuses on determining the role of viruses and their hosts in aquatic environments, from the surface to below the seafloor, through the characterization of their relationships. Dr. Labonté participated as a shipboard scientist on IODP Expedition 376 Brothers Arc Flux and worked on cores from Expeditions 337 Juan de Fuca Ridge-Flank Hydrogeology and 357 Atlantis Massif Serpentinization and Life.

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