Supplementary material from "Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes"
Version 2 2020-07-24, 08:19
Version 1 2020-07-22, 07:58
Posted on 2020-07-24 - 08:19
Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling associated with ocean current change and sea ice retreat. Here, we focus on a high-resolution, multi-disciplinary set of measurements that illustrate how microbial processes involved in the degradation of organic matter are directly coupled with inorganic and organic geochemical sediment properties (measured and modelled) as well as the extent/depth of bioturbation. We find direct links between aerobic processes, reactive organic carbon and highest abundances of bacteria and archaea in the uppermost layer (0–4.5 cm depth) followed by dominance of microbes involved in nitrate/nitrite and iron/manganese reduction across the oxic-anoxic redox boundary (approx. 4.5–10.5 cm depth). Sulfate reducers dominate in the deeper (approx. 10.5–33 cm) anoxic sediments which is consistent with the modelled reactive transport framework. Importantly, organic matter reactivity as tracked by organic geochemical parameters (n-alkanes, n-alkanoic acids, n-alkanols and sterols) changes most dramatically at and directly below the SWI together with sedimentology and biological activity but remained relatively unchanged across deeper changes in sedimentology.This article is part of the theme issue ‘The Changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystems’.
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Stevenson, Mark A.; Faust, Johan C.; Andrade, Luiza L.; Freitas, Felipe S.; Gray, Neil D.; Tait, Karen; et al. (2020). Supplementary material from "Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.5069817.v2
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AUTHORS (15)
MS
Mark A. Stevenson
JF
Johan C. Faust
LA
Luiza L. Andrade
FF
Felipe S. Freitas
NG
Neil D. Gray
KT
Karen Tait
KH
Katharine R. Hendry
RH
Robert G. Hilton
SH
Sian F. Henley
AT
Allyson Tessin
PL
Peter Leary
SP
Sonia Papadaki
AF
Ailbe Ford
CM
Christian März
GA
Geoffrey D. Abbott