Figure 4
From: Novel microbial assemblages inhabiting crustal fluids within mid-ocean ridge flank subsurface basalt
The abundant microbial lineages found within deep subseafloor basement fluids are rare or absent within sediments or seawater. (a) Heatmap of unique Illumina tag sequences rarefied to an even sampling depth (3250 reads) representing the 10 most abundant bacterial and archaeal lineages within borehole 1025C, U1301A, U1362A and U1362B deep subsurface fluids, and the 5 most abundant lineages within control, sediment and seawater samples. The scale bar indicates the total number of reads detected in the rarified samples. (b) Dufrêne–Legendre indicator species analysis of archaea and bacteria based on unique reads rarefied as in Figure 2 and using 1000 randomized iterations to calculate probabilities. The abundance of unique reads corresponding to each unique taxonomic lineage/sample source combination is indicated by circle size.
