Articles | Volume 18, issue 18
Biogeosciences, 18, 5203–5222, 2021
https://doi.org/10.5194/bg-18-5203-2021
Biogeosciences, 18, 5203–5222, 2021
https://doi.org/10.5194/bg-18-5203-2021

Research article 23 Sep 2021

Research article | 23 Sep 2021

Sedimentation rate and organic matter dynamics shape microbiomes across a continental margin

Sabyasachi Bhattacharya et al.

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Cited articles

Acharya, S. S. and Panigrahi, M. K.: Eastward shift and maintenance of Arabian Sea oxygen minimum zone: understanding the paradox, Deep-Sea Res. Pt. I, 115, 240–252, https://doi.org/10.1016/j.dsr.2016.07.004, 2016. 
Alam, M., Pyne, P., Mazumdar, A., Peketi, A., and Ghosh, W.: Kinetic enrichment of 34S during proteobacterial thiosulfate oxidation and the conserved role of SoxB in S–S bond breaking, Appl. Environ. Microb., 79, 4455–4464, https://doi.org/10.1128/AEM.00956-13, 2013. 
Alam, M., Fernandes, S., Mandal, S., Rameez, M. J., Bhattacharya, S., Peketi, A., Mazumdar, A., and Ghosh, W.: 34S enrichment as a signature of thiosulfate oxidation in the “Proteobacteria”, FEMS Microbiol. Lett., 368, fnab073, https://doi.org/10.1093/femsle/fnab073, 2021. 
Aller, R. C.: Sedimentary diagenesis, depositional environments, and benthic fluxes treatise on geochemistry, in: Treatise on Geochemistry, vol. 8, edited by: Holland, H. and Turekian, K. K., Elsevier, Oxford, UK, 293–334, https://doi.org/10.1016/B978-0-08-095975-7.00611-2, 2014. 
Aller, R. C. and Blair, N. E.: Early diagenetic remineralization of sedimentary organic C in the Gulf of Papua deltaic complex (Papua New Guinea): net loss of terrestrial C and diagenetic fractionation of C isotopes, Geochim. Cosmochim. Ac., 68, 1815–1825, https://doi.org/10.1016/j.gca.2003.10.028, 2004. 
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Physicochemical determinants of microbiome architecture across continental shelves–slopes are unknown, so we explored the geomicrobiology along 3 m sediment horizons of seasonal (shallow coastal) and perennial (deep sea) hypoxic zones of the Arabian Sea. Nature, concentration, and fate of the organic matter delivered to the sea floor were found to shape the microbiome across the western Indian margin, under direct–indirect influence of sedimentation rate and water column O2 level.
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