pone.0019223.g002.png

Phylogeny and relative composition of the sequenced nifH

assemblages.

Neighbor-joining phylogenetic tree of 92% similarity clustered

nifH sequences (79 090) and nearest relatives from ten

sampling locations. The relative number of sequences in each cluster is

shown in a heatmap with the median value of the dataset indicated in dark

blue and the highest value in pink. White indicates that there are no

sequences from the cluster present in the sample. Bootstrap values (500

replicates) >50% are indicated with grey circles proportional to

the size of the bootstrap value. Accession numbers of reference sequences,

sequence codes for each cluster and the absolute number of sequences for

each sample are shown in Figure S4.

Done