Fig. 2

Taxonomic composition and phylogenetic placement of reads from metagenomics sequences from vertebrate fish skin microbiomes and level 1 gene function subsystems. a) The relative abundance of microbial classes identified from the metagenomic libraries of elasmobranch and teleost fishes. Taxonomic identity was assigned by aligning reads to conserved protein-coding genes [38] and mapping their placement onto a tree generated from the conserved reads. b) Phylogenetic diversity of elasmobranch and teleost skin microbiomes samples. Reference tree from PhyloSift which contains 4165 identified microbial species based on 37 conserved gene regions. Phylogenetic placement for conserved genes identified in elasmobranch or teleost fish microbiomes is labeled as bars on the periphery of the tree. Bar height represents the relative proportion of genes identified to that microbial leaf on the reference tree. Each circle represents an elasmobranch or teleost fish species. Letters identify the region of the tree where major microbial clades occur. Major clades include (A) Eukaryota superkingdom, (B) Archaea superkingdom, (C) Bacteroidetes, (D) Alphaproteobacteria, (E) Betaproteobacteria, (F) Gammaproteobacteria, (G) Bacillus, (H) Firmicutes, (I) Cyanobacteria, and (J) Actinobacteria. c The relative abundance of microbial gene function subsystems to the level 1 categorization identified from the metagenomic libraries in elasmobranch and teleost fishes