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Alvin measuring at Crab Spa

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At Crab Spa, a diffuse-flow hydrothermal vent site on the East Pacific Rise, Alvin’s manipulator arm holds a sensor developed by Nadine Le Bris that measures temperature, pH, and sulfide in situ. WHOI microbial ecologist Stefan Sievert and colleagues are using the site to gain insights into chemosynthetic processes at deep-sea vents. With Ramunas Stepanauskas, the group recently obtained single microbial cells directly from the environment and are sequencing the DNA of the abundant, yet little-known microbes to get information on their physiology and metabolic potential. (Photo courtesy of Stefan Sievert, Woods Hole Oceanographic Institution)

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