A Serpentinite-Hosted Ecosystem: The Lost City Hydrothermal Field Deborah S. Kelley, Jeffrey A. Karson, Gretchen L. Früh-Green, Dana R. Yoerger, Timothy M. Shank, David A. Butterfield, John M. Hayes, Matthew O. Schrenk, Eric J. Olson, Giora Proskurowski, Mike Jakuba, Al Bradley, Ben Larson, Kristin Ludwig, Deborah Glickson, Kate Buckman, Alexander S. Bradley, William J. Brazelton, Kevin Roe, Mitch J. Elend, Adélie Delacour, Stefano M. Bernasconi, Marvin D. Lilley, John A. Baross, Roger E. Summons, and Sean P. Sylva

This supplement contains:

Materials and Methods
SOM Text
Figs. S1 and S2
Table S1
References
Movies S1 and S2

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• Movie S1.
  This structure, called the Nature pinnacle, rises 30 m above the seafloor and is actively venting fluids at temperatures up to 62°C. It is located on the eastern side of the field on a down-dropped bench (H on fig. S1). This video was taken from the submersible Alvin looking toward the north, and is shown at four times actual collection rates. The line on Marker H, shown at the summit of the tower, is 1 m in length.

• Movie S2.
  Strands of filamentous bacteria are abundant in areas of diffuse flow at Lost City. This video was taken with Alvin near the top of one of the edifices on Poseidon. The red dots in the first portion of the video are lasers spaced 10 cm apart. Venting temperatures measured around these zones were 60°C to 70°C. Small overhanging flanges of carbonate commonly trap pools of buoyantly rising hydrothermal fluids, providing excellent habitats for organisms. The red material in the second portion of the clip has not yet been identified, but we suspect that it is biological in origin.