Abundance and activity of the gammaproteobacterial taxa UBA10353 from the epi- to bathypelagic waters of the global ocean

Catalyzed reporter deposition fluorescence in situ hybridization combined with microautoradiography (MICRO-CARD-FISH) is used to obtain quantitative information on substrate uptake by prokaryotic communities. In this study, we used this methodology to quantify the abundance of a recently discovered gammaproteobacterial taxa, called UBA10353 and determine its activity. This study shows that UBA10353 is not only present in surface waters but throughout the water column in the global ocean. We found that UBA10353 is a mixotrophic organism being able to fix dissolved inorganic carbon at similar rates than taking up leucine.