Abstract
Subducting oceanic crusts release fluids rich in biologically relevant compounds into the overriding plate, fueling subsurface chemolithoautotrophic ecosystems. To understand the impact of subsurface geochemistry on microbial communities, we collected fluid and sediments from 14 natural springs across a ~200 km transect across the Costa Rican convergent margin and performed shotgun metagenomics. The resulting 404 metagenome-assembled genomes (MAGs) cluster into geologically distinct regions based on MAG abundance patterns: outer forearc-only (25% of total relative abundance), forearc/arc-only (38% of total relative abundance), and delocalized (37% of total relative abundance) clusters. In the outer forearc, Thermodesulfovibrionia, Candidatus Bipolaricaulia, and Firmicutes have hydrogenotrophic sulfate reduction and Wood-Ljungdahl (WL) carbon fixation pathways. In the forearc/arc, Anaerolineae, Ca. Bipolaricaulia, and Thermodesulfovibrionia have sulfur oxidation, nitrogen cycling, microaerophilic respiration, and WL, while Aquificae have aerobic sulfur oxidation and reverse tricarboxylic acid carbon fixation pathway. Transformation-based canonical correspondence analysis shows that MAG distribution corresponds to concentrations of aluminum, iron, nickel, dissolved inorganic carbon, and phosphate. While delocalized MAGs appear surface-derived, the subsurface chemolithoautotrophic, metabolic, and taxonomic landscape varies by the availability of minerals/metals and volcanically derived inorganic carbon. However, the WL pathway persists across all samples, suggesting that this versatile, energy-efficient carbon fixation pathway helps shape convergent margin subsurface ecosystems.
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Data availability
Metagenomic data are available in the NCBI SRA with project ID PRJNA627197. All MAGs analyzed in this study are also included under the same BioProject. BioSample accessions for each MAG are included in Supplementary Table S1. The full environmental dataset along with the R scripts for this analysis is available at https://github.com/TJrogers86/Costa-Rica-2017.git and released as a permanent version (v1.0.0) using Zenodo under https://doi.org/10.5281/zenodo.6259294.
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Acknowledgements
The authors acknowledge the Biology Meets Subduction Project, funded by the Alfred P. Sloan Foundation and the Deep Carbon Observatory (G-2016-7206) to PHB, JMdM, DG, and KGL, with DNA sequencing from the Census of Deep Life. Additional support came from NSF FRES (Award# 21211637) to PHB, JMdM and KGL. U. S. Department of Energy, Office of Science, Office of Biological and Environmental Research, Genomic Science Program (DE-SC0020369 to KGL) and FONDECYT Grant 11191138 (ANID Chile) and COPAS COASTAL ANID FB210021 to GLJ. DG, AC, and MS were partially supported by funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program Grant Agreement No. 948972—COEVOLVE—ERC-2020-STG.
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Conceptualization and funding acquisition were performed by PHB, JMdM, DG and KGL. Investigations and data acquisition were performed by TJR, KGL, DG, JB, GLJ, MOS, JAF, JMdM, CR, PHB, MY, MS, and AC. TJR performed data analysis, visualization, and drafted the paper with edits and feedback of from KGL, DG, JB, GLJ, MOS, JAF, JMdM, CR, PHB, MY, MS, and AC.
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Rogers, T.J., Buongiorno, J., Jessen, G.L. et al. Chemolithoautotroph distributions across the subsurface of a convergent margin. ISME J 17, 140–150 (2023). https://doi.org/10.1038/s41396-022-01331-7
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DOI: https://doi.org/10.1038/s41396-022-01331-7