Fig. 6

Co-occurrence networks of lactate-based chain elongation microbial communities. A Reactor microbiomes developed throughout reactors operation (n = 15); B at pH 5.0 (n = 9); and C throughout R1 operation (n = 9). Co-occurrence networks were built using significant correlations (P < 0.05). Strong correlations are depicted with green (> 0.8, positive correlation) and red (< − 0.8, negative correlation) edges with boldness related to the strength of the correlation. Positive and negative correlations with absolute values > 0.6 are shown with blue and orange edges, respectively, with increasing shading up to < 0.8. Nodes are sized based on ASVs betweenness centrality scores and coloured according to taxonomic classification at genus level