Nature Search

Urea use drives niche separation between dominant marine ammonia oxidizing archaea

Two groups of ammonia-oxidizing archaea drive marine nitrification. Stuehrenberg et al. reveal that their distribution reflects substrate use, with one relying on urea and the other on ammonia to maintain nitrification in open-ocean waters.

Joerdis Stuehrenberg
Katharina Kitzinger
Marcel M. M. Kuypers
ResearchOpen Access06 Dec 2025
Nature Communications

Volume: 16, P: 1-12
The 4.2 ka event is not remarkable in the context of Holocene climate variability

A study of more than 1000 paleoclimate datasets reveals that the ”4.2 ka event” is not a globally significant climate excursion, unlike the prominent 8.2 ka event. In the Holocene, site-level excursions are common, but global-scale events are rare.

Nicholas P. McKay
Darrell S. Kaufman
Frank Telles
ResearchOpen Access02 Aug 2024
Nature Communications

Volume: 15, P: 1-12
Denitrifying community in coastal sediments performs aerobic and anaerobic respiration simultaneously

Hannah K Marchant
Soeren Ahmerkamp
Marcel M M Kuypers
Research02 May 2017
The ISME Journal

Volume: 11, P: 1799-1812
Reply to ‘Pseudoreplication and greenhouse-gas emissions from rivers'

Sophie A. Comer-Warner
Paul Romeijn
Stefan Krause
ResearchOpen Access26 Nov 2019
Nature Communications

Volume: 10, P: 1-2
Single cell analyses reveal contrasting life strategies of the two main nitrifiers in the ocean

Ammonia oxidizing archaea and Nitrospinae are the main known nitrifiers in the ocean, but the much greater abundance of the former is puzzling. Here, the authors show that differences in mortality, rather than thermodynamics, cell size or biomass yield, explain the discrepancy, without the need to invoke yet undiscovered, abundant nitrite oxidizers.

Katharina Kitzinger
Hannah K. Marchant
Marcel M. M. Kuypers
ResearchOpen Access07 Feb 2020
Nature Communications

Volume: 11, P: 1-12
Rhizobia–diatom symbiosis fixes missing nitrogen in the ocean

A symbiosis between a diatom and a newly discovered species of alphaproteobacteria, ‘Candidatus Tectiglobus diatomicola’, can fix nitrogen in the ocean, providing evidence that nitrogen fixers other than cyanobacteria have a key role in the marine environment.

Bernhard Tschitschko
Mertcan Esti
Marcel M. M. Kuypers
ResearchOpen Access09 May 2024
Nature

Volume: 630, P: 899-904
Purple sulfur bacteria fix N₂ via molybdenum-nitrogenase in a low molybdenum Proterozoic ocean analogue

N₂ fixation was key to the expansion of life on Earth, but which organisms fixed N₂ and if Mo-nitrogenase was functional in the low Mo early ocean is unknown. Here, the authors show that purple sulfur bacteria fix N₂ using Mo-nitrogenase in a Proterozoic ocean analogue, despite low Mo conditions.

Miriam Philippi
Katharina Kitzinger
Marcel M. M. Kuypers
ResearchOpen Access06 Aug 2021
Nature Communications

Volume: 12, P: 1-12
The microbial nitrogen-cycling network

Nitrogen-transforming microorganisms shape global biogeochemical nutrient cycles. In this Review, Kuypers, Marchant and Kartal explore the vast diversity of these microorganisms and their enzymes, highlighting novel pathways, and discuss how nitrogen-transforming microorganisms form complex nitrogen-cycling networks in different environments.

Marcel M. M. Kuypers
Hannah K. Marchant
Boran Kartal
Reviews05 Feb 2018
Nature Reviews Microbiology

Volume: 16, P: 263-276
Terrestrial-type nitrogen-fixing symbiosis between seagrass and a marine bacterium

The N₂-fixing symbiont ‘Candidatus Celerinatantimonas neptuna’ lives inside the root tissue of the seagrass Posidonia oceanica, providing ammonia and amino acids to its host in exchange for sugars and enabling highly productive seagrass meadows to thrive in the nitrogen-limited Mediterranean Sea.

Wiebke Mohr
Nadine Lehnen
Marcel M. M. Kuypers
ResearchOpen Access03 Nov 2021
Nature

Volume: 600, P: 105-109
Cyanate and urea are substrates for nitrification by Thaumarchaeota in the marine environment

Thaumarchaeota isolates are capable of utilizing urea and cyanate for nitrification in vitro. Here, the authors show that this occurs in situ and that Thaumarchaeota are able to use urea and cyanate as an energy and nitrogen source in the marine environment.

Katharina Kitzinger
Cory C. Padilla
Laura A. Bristow
Research10 Dec 2018
Nature Microbiology

Volume: 4, P: 234-243
Small sinking particles control anammox rates in the Peruvian oxygen minimum zone

Up to 40% of the ocean’s fixed nitrogen is lost in oxygen minimum zones (OMZs) by anammox, but despite the importance of this process, nitrogen loss patterns in OMZs are difficult to predict. Here the authors show that ammonium release from small particles is a major control of anammox in the Peruvian OMZ.

Clarissa Karthäuser
Soeren Ahmerkamp
Marcel M. M. Kuypers
ResearchOpen Access28 May 2021
Nature Communications

Volume: 12, P: 1-12
Thermal sensitivity of CO₂ and CH₄ emissions varies with streambed sediment properties

Rivers and streams are important sources of carbon dioxide and methane; however, the drivers of these streambed gas fluxes are poorly understood. Here, the authors show that temperature sensitivity of streambed greenhouse gas emissions varies with substrate, organic matter content and geological origin.

Sophie A. Comer-Warner
Paul Romeijn
Stefan Krause
ResearchOpen Access18 Jul 2018
Nature Communications

Volume: 9, P: 1-9
Microenvironments on individual sand grains enhance nitrogen loss in coastal sediments

Farooq Moin Jalaluddin
Soeren Ahmerkamp
Marcel M. M. Kuypers
ResearchOpen Access11 May 2025
Scientific Reports

Volume: 15, P: 1-14
The effect of sediment grain properties and porewater flow on microbial abundance and respiration in permeable sediments

Soeren Ahmerkamp
Hannah K Marchant
Moritz Holtappels
ResearchOpen Access27 Feb 2020
Scientific Reports

Volume: 10, P: 1-12
Rapid microbial diversification of dissolved organic matter in oceanic surface waters leads to carbon sequestration

Philipp F. Hach
Hannah K. Marchant
Marcel M. M. Kuypers
ResearchOpen Access03 Aug 2020
Scientific Reports

Volume: 10, P: 1-10

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