Timothy G. Ferdelman

Algal glycans promote microbial turnover of organic matter through stabilization of subtidal permeable sandy sediments

Fabian Lange, Soeren Ahmerkamp, Aman Akeerath Mundanatt, Farooq Moin Jalaluddin et autres

Abstract Permeable sands on continental shelves host microbial communities that drive organic carbon turnover, oxygen fluxes and nitrogen loss. Advective porewater flow associated with sedimentary bedforms maintains these rates and fluxes. Modeling and laboratory studies suggest that advective porewater flow is tightly …

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Hypoxia increases microbial carbon assimilation of taurine in a seasonally anoxic fjord

Ömer K. Coskun, William D. Orsi, Ian P. G. Marshall, Katharina Muschler et autres

Hypoxic zones are expanding globally altering marine biogeochemical cycles. Within these low-oxygen regions, microbial communities play a key role in the production, degradation, and transformation of dissolved organic sulfur (DOS) compounds. Taurine is a bioavailable DOS compound widely utilized by marine microbes …

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Methane leakage through the sulfate–methane transition zone of the Baltic seabed

Timothy G. Ferdelman, Henrik Fossing, Sabine Flury, Wanda Holzhueter et autres

Anaerobic oxidation of methane at the sulfate–methane transition in marine sediments is generally considered to be a near-perfect barrier against methane release from the seabed, but the mechanisms involved are not well understood. On the basis of a survey of Baltic Sea …

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Sulfate reduction rates in Peru Margin sediments: From 1 cm to 100 m below seafloor

Jens Kallmeyer, Timothy G. Ferdelman, Bo Liu, R. John Parkes et autres

The Peruvian margin is one of the biologically most productive regions in the world ocean. The oxygen minimum zone impinges on the seabed over the outer continental shelf and across the upper slope to about 700 m water depth. Due to the …

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Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre

Mertcan Esti, Miriam Philippi, Julia Duerschlag, Timothy G. Ferdelman et autres

Abstract Nitrogen fixation is crucial for sustaining productivity in most of the open ocean. Cyanobacteria are the most prominent N2-fixers, but based on the nifH gene, a marker gene of the enzyme that fixes N2 into ammonia, non-cyanobacterial N2-fixers often predominate the …

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Methane leakage through the sulfate–methane transition zone of the Baltic seabed

L. Lapham, Karen G. Lloyd, Henrik Fossing, Sabine Flury et autres

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Particulate polysaccharides drive sediment stability and carbon-remineralization in coastal sediments

Fabian Lange, Aman Akeerath Mundanatt, Christian Winter, Jan‐Hendrik Hehemann et autres

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Simultaneous sulfate and nitrate reduction in coastal sediments

Olivia Bourceau, Timothy G. Ferdelman, Gaute Lavik, Marc Mußmann et autres

Abstract The oscillating redox conditions that characterize coastal sandy sediments foster microbial communities capable of respiring oxygen and nitrate simultaneously, thereby increasing the potential for organic matter remineralization, nitrogen (N)-loss and emissions of the greenhouse gas nitrous oxide. It is unknown to …

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Spatial dynamics of marine dissolved organic matter in the Benguela upwelling system

Gonzalo V. Gomez‐Saez, Ömer K. Coskun, Yanik Oertel, Jutta Niggemann et autres

Marine dissolved organic matter (DOM) is one of the largest active carbon pools on Earth, storing one thousand times more carbon than all living organisms in the ocean combined, and similar amounts of carbon than all CO2 in the atmospheric reservoir. Coastal …

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Behaviour of dissolved Neodymium Concentrations and Isotopes in the deep South Pacific Ocean

Henning Waltemathe, Torben Struve, Timothy G. Ferdelman, Katharina Pahnke

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Benthic biogeochemistry data from RV HEINCKE cruise HE582 to the German Bight, North Sea in late summer 2021

Fabian Lange, Soeren Ahmerkamp, Aman Akeerath Mundanatt, Gaute Lavik et autres

This dataset contains data from the RV Heincke cruise HE582 to the German Bight of the North Sea in late summer 2021. The aim of the research was to investigate the source of sedimentary glycan concentrations in subtidal sandy sediments. Glycans represent …

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Niche partitioning by photosynthetic plankton as a driver of CO2-fixation across the oligotrophic South Pacific Subtropical Ocean

Julia Duerschlag, Wiebke Mohr, Timothy G. Ferdelman, Julie LaRoche et autres

Abstract Oligotrophic ocean gyre ecosystems may be expanding due to rising global temperatures [1–5]. Models predicting carbon flow through these changing ecosystems require accurate descriptions of phytoplankton communities and their metabolic activities [6]. We therefore measured distributions and activities of cyanobacteria and …

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