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个人简介
I study life in marine sediment, deep beneath the seafloor. This deep subsurface world contains one of the very few ecosystems not yet pervasively altered by humans. With my students and collaborators, I study the abundance, activities and evolution of life in this remote microbial ecosystem. In doing so, we explore fundamental limits to life on Earth. Very little energy is available to support life in this ecosystem. We have demonstrated that these microbes respire orders of magnitude more slowly than microbes in the surface world. On average, they take hundreds of years to turn over the molecules in their bodies. Despite these very slow rates of activity, the total amount of life in marine sediment rivals the total amount in all the waters of the entire ocean. Some of my students are currently testing the possibility that many subseafloor microbes live on hydrogen produced by natural radioactive splitting of water. Other members of my group are documenting (i) microbial exchange between the ocean and this deep subsurface world, and (ii) the nature of taxonomic selection in this extraordinarily challenging environment.
研究兴趣
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EARTHS FUTUREno. 5 (2023)
GEOPHYSICAL RESEARCH LETTERSno. 7 (2022)
Goldschmidt2022 abstracts (2022)
Bulletin of the AASVol 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers)no. 4 (2021)
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