Fig. 5

Distribution and co-occurrence of selected metabolic genes represented various biofunctions in MAGs. A Percentages of selected metabolic genes across class level in MAGs found in ME only, MT only, and both. Percentages of genomes of each class were shown in four levels: > 50% in dark red, 20–50% in orange, < 20% in light orange, while none in white. All MAGs used are above middle-quality (> 50% completeness and < 10% contamination). Key genes are corresponding to the gene IDs in Fig. 4 and Additional file 3: Table S2. B Co-occurrence network of selected metabolic genes in MAGs of ME or MT. All nodes with edges that binary-Jaccard distance > 0.3 are presented with circles. Colors of each node are corresponding to the color bar of biofunctions for selected metabolic genes in A