Fig. 4: Specific carbon uptake rates and genetic potential for carbon uptake in microbialite systems.

A In situ specific carbon uptake rates measured using 13C tracer. B Carbon energy metabolism gene clusters (KO) present in the metagenomes of stromatolite samples used for carbon uptake experiments. Listed are the relative abundances of genes/clusters involved in photosynthesis, photosynthesis-antenna proteins, photosynthetic carbon fixation, methane metabolism, and other carbon fixation pathways in prokaryotes. CR Cape Recife, SK Schoenmakerskop, TP Thyspunt, OV745: Cape St Francis.