1. Department of Biology; University of Alabama at Birmingham; Birmingham, AL 35294 U.S.A.
2. Department of Biological Sciences, Florida Institute of Technology; 150 West University Boulevard; Melbourne, FL 32901 U.S.A.
3. Department of Applied Ocean Physics and Engineering; Woods Hole Oceanographic Institution; Woods Hole, MA 02543 U.S.A.
4. Ocean and Earth Science; University of Southampton; European Way Southampton, SO14 3ZH U.K.
5. Nature Imagery, under contract to Department of Applied Ocean Physics and Engineering; Woods Hole Oceanographic Institution; Woods Hole, MA 02543 U.S.A.