Fig. 2: Abundance of metabolic genes encoded by marine communities.
From: Molecular hydrogen in seawater supports growth of diverse marine bacteria
The abundance of metabolic marker genes is shown on the basis of the metagenomic short reads across the seawater sampled from the three study sites (left; n = 14), metagenomic short reads from the Tara Oceans dataset (middle; n = 213; replicates averaged) and metatranscriptomic short reads from the Tara Oceans dataset (right; n = 89; replicates averaged). Homology-based searches were used to calculate the relative abundance of marker genes as average gene copies per organism for the metagenomes (abundance relative to a set of universal single-copy marker genes; equivalent to the estimated proportion of the community encoding a given gene as a single copy) and RPKM for the metatranscriptomes. Where multiple marker genes are listed, values are summed. The bottom panels show the hydrogenase subgroups present in each sample. SUR, surface; DCM, deep chlorophyll maximum; MES, mesopelagic ocean layers.
