Fig. 4

The co-occurrence network interactions of straw decomposition bacteria at each experimental site based on random matrix theory (RMT) analysis from OTU profiles (a). Subnetworks to visualize interactions between Actinobacteria and other members at each experimental site (b). Each node represents a bacterial phylotype (an OTU clustered at 97% identity threshold). Red and blue lines respectively represent negative and positive correlations between nodes. The size of each node is proportional to the relative abundance of OTU. For more detailed information on (b), see Additional file 2: Table S6