PCoA ordinates of all 56 global ocean samples are primarily driven by geographical location. (a) Geographic locations of all samples. (b) PCoA plot with k = 5 and dissimilarity measure d2S|M0. For the location, Sargasso Sea samples are colored blue, North America East Costal samples are colored black, Caribbean Sea samples are colored cyan, Eastern Tropical Pacific samples are colored green, Galapagos Islands samples are colored pink, Tropical South Pacific samples are colored red and Polynesian Archipelagos samples are colored yellow. For the habitat type, open ocean samples are marked as discs, coastal samples are marked as squares, and other habitat samples are marked with open circles.
Jiang et al. BMC Genomics 2012 13:730 doi:10.1186/1471-2164-13-730