Fig. 5
From: Contrasting Nitrogen Fixation Between Arctic and Atlantic Waters in the Fram Strait
Maximum-likelihood phylogenetic tree (partial nifH amino acid sequences) for the 20 most abundant amplicon sequence variants (AVSs) and ASVs dominant at the stations where nitrogen fixation was measurable (shown in green; see Table S3). Reference sequences are nearest relatives from the NCBI database. Arctic reference sequences are displayed in blue. Clusters are nifH phylogenetic clusters [83]. Cluster I includes Cyanobacteria, Firmicutes, Beta- and Gammaproteobacteria whereas Cluster III includes Deltaproteobacteria