Fig. 4
The co-occurrence networks of microbial communities in the surface layer (yellow), middle layer (red) and deep layer (blue) sediments. A The network nodes were separated by within-module connectivity (Zi) and among-module connectivity (Pi). Threshold values of Zi and Pi for categorizing microbial taxa were 2.5 and 0.62, respectively. B The overall topological characteristics at different sediment layers