This work was supported by the Joint Oceanographic Institutions-Science Support Program (JOI-USSSP) (grant 418920-BA344 to B. Flower). This research used samples and/or data provided by the Ocean Drilling Program (ODP) (under sample request 18034B). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under the management of Joint Oceanographic Institutions (JOI), Inc. Kate Chisholm was supported by a University of South Florida College of Marine Science/Eckerd College summer internship for 2004. We thank Ann Holbourn and Mark Leckie for thoughtful reviews, Ilsa Johansen for laboratory assistance, and Ethan Goddard for maintenance of the SIRMS in the College of Marine Science.