Fig. 2. Genome-wide abundance and activity profiling of marine prokaryotic genomes in the global surface ocean.

a World map of Tara Oceans sampling stations (N = 81) for which euphotic (SRF and DCM) metatranscriptomes are available for a prokaryote-enriched size fraction (0.22–3 μm). The percentage of mapped RNA reads are depicted for each euphotic sample (N = 118). b Genome-wide abundance and expression were significantly associated (Spearman rho=0.68, p = 0), albeit a number of genomes display lower expression levels. c Principal Coordinates Analyses (PCoA) for genome community abundances (across 107 samples with metagenomics data) and activities (across a subset of 71 samples with both metagenomics and metatranscriptomics data available). Genome community abundance and activity (PCo1) are significantly associated with temperature. Community abundance (PCo2) is also associated with pH and Photosynthetically Available Radiation (PAR), while community activity is associated with PO₄ and iron concentrations.