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Abstract
Despite accounting for a significant portion of the Earth’s prokaryotic biomass, controls on the abundance and biodiversity of microorganisms residing in the continental subsurface are poorly understood. To redress this, we compiled cell concentration and microbial diversity data from continental subsurface localities around the globe. Based on considerations of global heat flow, surface temperature, depth and lithology, we estimated that the continental subsurface hosts 2 to 6 × 1029 cells and found that other variables such as total organic carbon and groundwater cellular abundances do not appear to be predictive of cell concentrations in the continental subsurface. Although we were unable to identify a reliable predictor of species richness in the continental subsurface, we found that bacteria are more abundant than archaea and that their community composition was correlated to sample lithology. Using our updated continental subsurface cellular estimate and existing literature, we estimate that the total global prokaryotic biomass is approximately 23 to 31 Pg of carbon C (PgC), roughly 4 to 10 times less than previous estimates.
Details
; L-H, Lin 2 ; Dong, H 3 ; Bomberg, M 4
; Ghiorse, W 5 ; Stan-Lotter, H 6 ; Pedersen, K 7 ; Kieft, T L 8 ; E van Heerden 9 ; Onstott, T C 10 1 Flatiron Institute Center for Computational Biology, Simons Foundation, New York, NY, USA
2 Department of Geosciences, National Taiwan University, Taipei, Taiwan
3 Department of Geology and Environmental Earth Science, Miami University, Oxford, OH, USA
4 VTT Technical Research Centre of Finland, Espoo, Finland
5 Department of Microbiology, Cornell University, Ithaca, NY, USA
6 Division of Molecular Biology, University of Salzburg, Salzburg, Austria
7 Microbial Analytics Sweden AB, Mölnlycke, Sweden
8 Department of Biology, New Mexico Institute of Mining and Technology, Socorro, NM, USA
9 Department of Microbial, Biochemical, and Food Biotechnology, University of the Free State, Bloemfontein, South Africa; Biosaense Solutions, Bloemfontein, South Africa
10 Department of Geosciences, Princeton University, Princeton, NJ, USA