Microbial mediation of benthic biogenic silica dissolution |
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| Authors: | Jan M Holstein Christian Hensen |
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| Institution: | 1. Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, P.O.?Box 2503, 26111, Oldenburg, Germany
2. Leibniz-Institut für Meereswissenschaften, IFM-GEOMAR, Wischhofstr.?1–3, 24148, Kiel, Germany
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| Abstract: | Pore water profiles from 24 stations in the South Atlantic (located in the Guinea, Angola, Cape, Guyana, and Argentine basins)
show good correlations of oxygen and silicon, suggesting microbially mediated dissolution of biogenic silica. We used simple
analytical transport and reaction models to show the tight coupling of the reconstructed process kinetics of aerobic respiration
and silicon regeneration. A generic transport and reaction model successfully reproduced the majority of Si pore water profiles
from aerobic respiration rates, confirming that the dissolution of biogenic silica (BSi) occurs proportionally to O2 consumption. Possibly limited to well-oxygenated sediments poor in BSi, benthic Si fluxes can be inferred from O2 uptake with satisfactory accuracy. Compared to aerobic respiration kinetics, the solubility of BSi emerged as a less influential
parameter for silicon regeneration. Understanding the role of bacteria for silicon regeneration requires further investigations,
some of which are outlined. The proposed aerobic respiration control of benthic silicon cycling is suitable for benthic–pelagic
models. The empirical relation of BSi dissolution to aerobic respiration can be used for regionalization assessments and estimates
of the silicon budget to increase the understanding of global primary and export production patterns. |
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