Fig. 3

Cross-domain co-occurrence networks were calculated across all fractions for total microbial (12C) community (A) and enriched community after a 13CO2 plant labelling experiment in sand-filled ingrowth bags in a grassland soil (B). Nodes are colored by domain (bacteria or fungi) and relative size within each network represents the degree of each node indicating the number of connections it has to other nodes. The node size in the enriched community (13C) network represents the excess atom fraction (EAF) of each bacterial ASV or fungal OTU