\section{Acknowledgements}

This research was conducted as part of the 2010 Marine Biological
Laboratory{'}s Microbial Diversity Course. Funding was supplied by the MBL, the
Bernard Davis Endowed Scholarship Fund, and the Selman A. Waksman Endowed
Scholarship. We would like to thank Dan Buckley and Steve Zinder for
organizing the course, Marshall Otter, Mathew Erickson, Hugh Ducklow and Jay T.
Lennon for analytical support and the Austrian FWF MICDIF award to Tom Battin
for salary support.

