FIG. 6.

Presence or absence of phylogenetic groups in LCHF carbonate chimney and fluid samples. Colored and empty boxes indicate the presence and absence, respectively, of specific phylogenetic groups identified in Fig. 3 to 5. The gray box indicates the presence of a peak corresponding to LCMS of very low relative peak height, and the question marks indicate that TRFs corresponding to the “subsurface” clade were identified in the samples but did not match the sample profile within ±2 bp (see the text for details). “C” and “F” in the top row indicate carbonate chimney or fluid samples, respectively. “nd,” no data are available. Abbreviations: ANME-1, anaerobic methanotrophic Archaea; LCMS, Lost City Methanosarcinales; Thermoc., Thermococcus; Unc. Eury., uncultured Euryarchaeota; Unc. Cren, uncultured Crenarchaeota; MG I, MG II, and MG III, marine groups I, II, and III, respectively; CFB, Cytophaga-Flavobacterium-Bacteroides. Desulfotom., Desulfotomaculum. Unc. Epsilon, uncultured epsilon-proteobacteria.