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Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes.
Philos Trans A Math Phys Eng Sci. 2020 Oct 02; 378(2181):20200223.PT

Abstract

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 ecosystem functioning'.

Authors+Show Affiliations

School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK.School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.Department of Geography, Science Laboratories, Durham University, South Road, Durham DH1 3LE, UK.School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK.Department of Geology, Kent State University, Kent, OH 44240, USA.School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32862813

Citation

Stevenson, Mark A., et al. "Transformation of Organic Matter in a Barents Sea Sediment Profile: Coupled Geochemical and Microbiological Processes." Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, vol. 378, no. 2181, 2020, p. 20200223.
Stevenson MA, Faust JC, Andrade LL, et al. Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes. Philos Trans A Math Phys Eng Sci. 2020;378(2181):20200223.
Stevenson, M. A., Faust, J. C., Andrade, L. L., Freitas, F. S., Gray, N. D., Tait, K., Hendry, K. R., Hilton, R. G., Henley, S. F., Tessin, A., Leary, P., Papadaki, S., Ford, A., März, C., & Abbott, G. D. (2020). Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes. Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, 378(2181), 20200223. https://doi.org/10.1098/rsta.2020.0223
Stevenson MA, et al. Transformation of Organic Matter in a Barents Sea Sediment Profile: Coupled Geochemical and Microbiological Processes. Philos Trans A Math Phys Eng Sci. 2020 Oct 2;378(2181):20200223. PubMed PMID: 32862813.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes. AU - Stevenson,Mark A, AU - Faust,Johan C, AU - Andrade,Luiza L, AU - Freitas,Felipe S, AU - Gray,Neil D, AU - Tait,Karen, AU - Hendry,Katharine R, AU - Hilton,Robert G, AU - Henley,Sian F, AU - Tessin,Allyson, AU - Leary,Peter, AU - Papadaki,Sonia, AU - Ford,Ailbe, AU - März,Christian, AU - Abbott,Geoffrey D, Y1 - 2020/08/31/ PY - 2020/9/1/entrez PY - 2020/8/31/pubmed PY - 2021/6/16/medline KW - Barents sea KW - carbon cycling KW - geochemistry KW - marine sediment KW - microbial processes KW - organic matter reactivity SP - 20200223 EP - 20200223 JF - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences JO - Philos Trans A Math Phys Eng Sci VL - 378 IS - 2181 N2 - 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 ecosystem functioning'. SN - 1471-2962 UR - https://www.unboundmedicine.com/medline/citation/32862813/Transformation_of_organic_matter_in_a_Barents_Sea_sediment_profile:_coupled_geochemical_and_microbiological_processes_ L2 - https://royalsocietypublishing.org/doi/10.1098/rsta.2020.0223?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -