1. Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
2. Centre for Comparative Genomics and Evolutionary Bioinformatics, Dalhousie University, Halifax, Nova Scotia, Canada.
3. School of Environmental Sciences, University of Liverpool, Liverpool, UK.
4. Department of Mathematics and Statistics, Dalhousie University, Halifax, Nova Scotia, Canada.
5. GEOMAR Helmholtz Center for Ocean Research Kiel, Wischhofstrasse 1-3, 24148 Kiel, Germany.
6. Microbial and Environmental Genomics, J. Craig Venter Institute, La Jolla, CA 92037, USA.
7. Integrative Oceanography Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92037, USA.