In PLoS Biology, volume 3, issue 4, DOI:
The figure credits for Figures 1 and 2 are missing from the PDF versions
of the article. For
Figure 1, images are
courtesy of Langdon Quetin and Robin Ross, researchers at the Marine Science Institute, University of California, Santa Barbara, and funded by the Office of Polar Programs, National Science Foundation. For Figure 2, images are courtesy of Donna Fraser.