Functional genes, genome size, GC content and small subunit 16S rRNA presence in MAGs. Heat maps indicate total MAG scaffold size, number of contigs, GC content, completeness and contamination. Presence and absence of all SSU rRNA genes >300 bp and presence of genes encoding functional genes are indicated by black boxes: pmoA, particulate methane monooxygenase; nrfAD, nitrite reductase; norBC, nitric oxide reductase; nosZDFY, nitrous oxide reductase; dsrAB, dissimilatory sulfite reductase; napABC, periplasmic nitrate reductase; narABDG, nitrate reductase; nirBDG, nitrite reductase; hydB, sulfur reductase; phsA, thiosulfate reductase; redH, reductive dehalogenase; ICL, isocitrate lyase.