Fig. 2.

Prokaryotic community composition shown as the relative abundance of 16S rRNA genes in the Black Sea water column at 1000 m with and without the addition of OM.A. Water column community from collected suspended particulate matter (SPM) using the metagenomic data, 2013 and 2017 amplicon data sets.B. Incubations with unlabelled dissolved organic matter (DOM) and ¹³C/¹⁵N labelled dissolved organic matter (L‐DOM).C. Incubations with unlabelled protein (PRO) and ¹³C/¹⁵N labelled protein (L‐PRO).D. The community composition of the active operational taxonomic units (OTUs). E. Absolute abundance of prokaryotes (estimated as 16S rRNA gene copies L⁻¹) for the different treatments, with red areas depicting the amount of copies that were assigned to labelled OTUs calculated by using the relative abundance of OTUs assigned as active. [Color figure can be viewed at wileyonlinelibrary.com]