1. Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA
2. Department of Biology, Middlebury College, Middlebury, VT 05753, USA
3. Hollings Marine Lab, College of Charleston, Charleston, SC 29412, USA
4. Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, UK
5. Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, USA
6. Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA
7. Institute for Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, CA 92093, USA
8. Department of Geology and Environmental Geosciences Northern, Illinois University, DeKalb, IL 60115, USA
9. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA
10. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
11. Bristol Glaciology Centre, Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK