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Sediments from a seasonally euxinic coastal ecosystem show high nitrogen cycling potential

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Název: Sediments from a seasonally euxinic coastal ecosystem show high nitrogen cycling potential
Autoři: Isabel M. L. Rigutto, Ştefania C. Sburlan, Lars W. P. de Bont, Tom Berben, Rob M. de Graaf, Caroline P. Slomp, Mike S. M. Jetten
Zdroj: Environ Microbiol
Environmental Microbiology, 27, 7, pp. 1-15
Informace o vydavateli: Cold Spring Harbor Laboratory, 2025.
Rok vydání: 2025
Témata: Nitrites/metabolism, Microbiota, Geologic Sediments/microbiology, Nitrous Oxide/metabolism, Eutrophication, Nitrates/metabolism, Nitrogen Cycle, Nitrification, Ammonium Compounds/metabolism, Ecological Microbiology, Bacteria/metabolism, Denitrification, Nitrogen/metabolism, Research programm of Radboud Institute for Biological and Environmental Sciences, Seasons, SDG 14 - Life Below Water, Lakes/microbiology, Oxidation-Reduction, Ecosystem, Research Article
Popis: Coastal ecosystems are susceptible to eutrophication and deoxygenation, which may alter their nitrogen cycle dynamics. Here, we investigated the microbial nitrogen cycling potential in the sediment of a seasonally euxinic coastal ecosystem (Lake Grevelingen, NL), in winter and summer. Porewater profiles showed ammonium (NH4+) concentrations exceeding 10 mM and rapid depletion of electron acceptors with depth. Activity tests revealed NH4+oxidation potential up to 53 µmol g−1day−1, even in anoxic sediment layers. A nitrifying microbial community was present in both oxic and anoxic sediment sections (up to 1.4% relative abundance). NO₃⁻, nitrite (NO2−) and nitrous oxide (N2O) reduction potential were prominent across all sediment sections, with the highest rates (167 µmol NO3−g−1day−1) in the surface sediment in summer. Denitrification (79.3-98.4%) and dissimilatory nitrate reduction to ammonium (DNRA; 1.6-20.7%) were the major NO3−removal pathways, as supported by the detection of thenarG/napA, nirK/nirS, norB, nosZandnrfA/otrgenes in all sediment sections. The DNRA contribution increased with depth and with the addition of electron donors, such as monomethylamine. Anaerobic ammonium oxidation (anammox) was not detected in these eutrophic sediments. Combined, our results show that there is high potential for nitrogen removal in eutrophic coastal ecosystems which may help further restoration measures.
Druh dokumentu: Article
Other literature type
ISSN: 1462-2920
1462-2912
DOI: 10.1101/2025.02.26.640368
DOI: 10.1111/1462-2920.70139
Přístupová URL adresa: https://research-portal.uu.nl/en/publications/211b691a-67e3-46e1-968b-e2b9f7d64730
https://doi.org/10.1111/1462-2920.70139
https://repository.ubn.ru.nl//bitstream/handle/2066/320801/320801.pdf
https://hdl.handle.net/2066/320801
Rights: CC BY NC ND
URL: https://www.biorxiv.org/about/FAQ#license
URL: http://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (http://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
Přístupové číslo: edsair.doi.dedup.....8715b874be94fbfbd0c2f16399aca1a0
Databáze: OpenAIRE
Popis
Abstrakt:Coastal ecosystems are susceptible to eutrophication and deoxygenation, which may alter their nitrogen cycle dynamics. Here, we investigated the microbial nitrogen cycling potential in the sediment of a seasonally euxinic coastal ecosystem (Lake Grevelingen, NL), in winter and summer. Porewater profiles showed ammonium (NH4+) concentrations exceeding 10 mM and rapid depletion of electron acceptors with depth. Activity tests revealed NH4+oxidation potential up to 53 µmol g−1day−1, even in anoxic sediment layers. A nitrifying microbial community was present in both oxic and anoxic sediment sections (up to 1.4% relative abundance). NO₃⁻, nitrite (NO2−) and nitrous oxide (N2O) reduction potential were prominent across all sediment sections, with the highest rates (167 µmol NO3−g−1day−1) in the surface sediment in summer. Denitrification (79.3-98.4%) and dissimilatory nitrate reduction to ammonium (DNRA; 1.6-20.7%) were the major NO3−removal pathways, as supported by the detection of thenarG/napA, nirK/nirS, norB, nosZandnrfA/otrgenes in all sediment sections. The DNRA contribution increased with depth and with the addition of electron donors, such as monomethylamine. Anaerobic ammonium oxidation (anammox) was not detected in these eutrophic sediments. Combined, our results show that there is high potential for nitrogen removal in eutrophic coastal ecosystems which may help further restoration measures.
ISSN:14622920
14622912
DOI:10.1101/2025.02.26.640368