Fig. 5: Interactions of algae and bacteria in MBGS.

The co-occurrence networks between dominant microorganisms (top 20) of MBGS at phylum (a) and class (b) level. Notes: Nodes represented each dominant phylum or class, and the connections between nodes indicated a correlation between the two microorganisms. The red line indicated a positive correlation, while the blue line indicated a negative correlation. The size of the node was directly proportional to the relative abundance of the microorganisms in the entire sample. The edges thickness was proportional to the relevance degree.