Fig. 6: Representation of proposed ecological roles of Hebobacteria and Zipacnadia. | ISME Communications

Fig. 6: Representation of proposed ecological roles of Hebobacteria and Zipacnadia.

From: Expansion of Armatimonadota through marine sediment sequencing describes two classes with unique ecological roles

Fig. 6

Class distinctions are denoted by text and color; all unique environmental contributions are shown with the associated protein colored by the class in which it is present. Eight Hebobacteria MAGs were located in the anoxic sediments of the Bohai Sea with depths of 26–44 cm below the water-sediment interface. Zipacnadia MAGs and 5/13 Hebobacteria were located in the anoxic sediments of the Guaymas Basin with depths of 0–20 cm below the water-sediment interface. All MAGs are anaerobic, functioning primarily on the intermediate compounds sulfite, nitrite, and hydroxylamine provided by sulfate and nitrate reducing microbes in nearby sediments. Organic Matter (OM) includes buried sedimentary carbon metabolized by heterotrophs to produce CO2 used directly in the WLP of all MAGs. Both classes likely play a dominant role in supplying usable carbon through acetate secretion and additional degradation of refractory or inorganic matter. Complex carbon degradation is confirmed by the presence of specific extracellular CAZymes (GH62, GH141, GH136), shown here. More distinctions in identified metabolic pathways and capabilities are clearly differentiated between groups in Fig. 4. Created using BioRender.com.

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