Extended Data Figure 4: Association between abundant viral clusters and abundance and diversity of host groups.
From: Ecogenomics and potential biogeochemical impacts of globally abundant ocean viruses
a, Abundance and diversity of bacterial and archaeal host groups associated with the 38 abundant viral clusters (see Fig. 2a). For each host group (at the phylum level, except for Proteobacteria where the class level is used), the different panels display, from top to bottom: (i) the number of viral clusters associated with this host group; (ii) the global relative abundance of this group estimated from the microbial metagenomic OTU counts; (iii) the global diversity of this group based on a Chao index computation including all Tara Oceans microbial metagenome samples (that is, including both alpha and beta diversity); (iv) the distribution of Chao indexes by sample for this group (the alpha diversity); and (v) the average Sorensen index between pairs of samples that include at least one OTU of this group (the beta diversity). OTU counts were derived from the 109 epipelagic microbial metagenomes described previously18. b, Pearson correlations between host-group relative abundance or diversity indices (global Chao index, average Chao index across samples and average Sorensen index across samples) and the number of viral clusters.