Fig. 1. Volumetric distribution and flux of sediment, cells, organic carbon, and energy across major marine sediment catabolic zones in global Quaternary subseafloor sediment.

(A) The proportion of total sediment volume (cubic centimeters), number of microbial cells, POC stored (petagrams of C) and degraded (petagrams of C per year), and power used (gigawatts) in each catabolic zone in Quaternary sediment. (B) Frequency distribution of cell-specific power utilization in Quaternary-age sediment. Green denotes oxic, lilac signifies sulfate-reducing, and orange represents methanogenic sediment.