Articles | Volume 19, issue 1
Biogeosciences, 19, 201–221, 2022
https://doi.org/10.5194/bg-19-201-2022
Biogeosciences, 19, 201–221, 2022
https://doi.org/10.5194/bg-19-201-2022

Research article 13 Jan 2022

Research article | 13 Jan 2022

Bacteriohopanetetrol-x: constraining its application as a lipid biomarker for marine anammox using the water column oxygen gradient of the Benguela upwelling system

Zoë R. van Kemenade et al.

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Short summary
Anaerobic ammonium oxidation (anammox) is an important nitrogen-removal process in the ocean. We assess the distribution of bacteriohopanetetrol-x (BHT-x), used to trace past anammox, along a redox gradient in the water column of the Benguela upwelling system. BHT-x / BHT ratios of >0.18 correspond to the presence of living anammox bacteria and oxygen levels <50 μmol L−1. This allows for a more robust application of BHT-x to trace past marine anammox and deoxygenation in dynamic marine systems.
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