Fig. 2
From: Structure and function of the Arctic and Antarctic marine microbiota as revealed by metagenomics
Phylum-level (class level for Proteobacteria) taxonomic structure of the 60 polar seawater metagenomes. Relative abundance of the phyla was calculated based on 16S miTag numbers. The top 30 phyla in terms of maximum relative abundance among the metagenomes are shown with all other phyla and the unclassified miTags are grouped together as “Minor or unclassified.” The four groups: Arctic-Surface (0-100 m), Arctic-Deep (200-4000 m), Antarctic-Surface (0-100 m), and Antarctic-Deep (200-4000 m)