Fig. 1: Phylogeny and functional module clustering of diazotrophs.
From: Distribution and survival strategies of endemic and cosmopolitan diazotrophs in the Arctic Ocean
a Three types of dendrograms representing nifH phylogeny, conserved marker gene phylogeny, and hierarchical clustering based on the functional module completion ratio (MCR) [33]. The seven Arctic MAGs listed in Table 1 (shown in bold) and cyanobacterial diazotrophs C. chwakensis and C. subtropica are included, along with MAGs constructed from a metagenomic dataset from samples collected in the subtropical ocean [14, 15]. Label colors represent phylum- or class-level taxonomy. The nifH phylogenetic tree is rooted with cyanobacterial sequences to be consistent with the other trees. The red arrow indicates MAGs with mismatch between nifH and conserved marker genes phylogeny. b nifH phylogenetic tree of UCYN-A, for which nearly the whole genome has been assembled (Supplementary Table S2). The phylogenetic tree was estimated with the maximum-likelihood method based on the full length of the nifH sequence and the conserved marker genes using PhyloPhlAn. The branches in the nifH phylogenetic trees belonging to Clusters I and III are shown with black and green lines, respectively.
