Timothy G. Ferdelman

Max Planck Institute for Marine Microbiology

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Bo Barker Jørgensen

Aarhus University

Benjamin Brunner

The University of Texas at El Paso

Marcel M. M. Kuypers

Max Planck Institute for Marine Microbiology

Tobias Goldhammer

Leibniz Institute of Freshwater Ecology and Inland Fisheries

Sten Littmann

Max Planck Institute for Marine Microbiology

Laura M. Wehrmann

Stony Brook University

Henrik Fossing

Aarhus University

Alexey Kamyshny

Ben-Gurion University of the Negev

Steven D’Hondt

University of Rhode Island

Jens Kallmeyer

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Cooperative Institutions

Max Planck Institute for Marine Microbiology

126

Max Planck Society

University of Bremen

Carl von Ossietzky Universität Oldenburg

Aarhus University

University of Rhode Island

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Roger Williams University

Woods Hole Oceanographic Institution

International Ocean Discovery Program

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Microbial sequestration of phosphorus in anoxic upwelling sediments

Nature Geoscience (2010)

Tobias Goldhammer Volker Brüchert Timothy G. Ferdelman Matthias Zabel

Phosphorite

10.1038/ngeo913

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Citations (242)

Single-cell imaging of phosphorus uptake shows that key harmful algae rely on different phosphorus sources for growth

Scientific Reports (2018)

Niels J. Schoffelen Wiebke Mohr Timothy G. Ferdelman Sten Littmann Julia Duerschlag

Abstract Single-cell measurements of biochemical processes have advanced our understanding of cellular physiology in individual microbes and microbial populations. Due to methodological limitations, little is known about single-cell phosphorus (P) uptake and its importance for microbial growth within mixed field populations. Here, we developed a nanometer-scale secondary ion mass spectrometry (nanoSIMS)-based approach to quantify single-cell P uptake in combination with cellular CO 2 and N 2 fixation. Applying this approach during a harmful algal bloom (HAB), we found that the toxin-producer Nodularia almost exclusively used phosphate for growth at very low phosphate concentrations in the Baltic Sea. In contrast, the non-toxic Aphanizomenon acquired only 15% of its cellular P-demand from phosphate and ~85% from organic P. When phosphate concentrations were raised, Nodularia thrived indicating that this toxin-producer directly benefits from phosphate inputs. The phosphate availability in the Baltic Sea is projected to rise and therefore might foster more frequent and intense Nodularia blooms with a concomitant rise in the overall toxicity of HABs in the Baltic Sea. With a projected increase in HABs worldwide, the capability to use organic P may be a critical factor that not only determines the microbial community structure, but the overall harmfulness and associated costs of algal blooms.

Aphanizomenon

Bloom

10.1038/s41598-018-35310-w

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Citations (54)

Distributions of Microbial Activities in Deep Subseafloor Sediments

Science (2004)

Steven D’Hondt Bo Barker Jørgensen D.J. Miller Anja Batzke Ruth E. Blake

Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rely on electron acceptors and electron donors from the photosynthetic surface world. At open-ocean sites, nitrate and oxygen are supplied to the deepest sedimentary communities through the underlying basaltic aquifer. In turn, these sedimentary communities may supply dissolved electron donors and nutrients to the underlying crustal biosphere.

Electron acceptor

10.1126/science.1101155

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Citations (748)

Mechanisms of damage to corals exposed to sedimentation

Proceedings of the National Academy of Sciences (2012)

Miriam Weber Dirk de Beer Christian Lott Lùbos Polerecký Katharina Kohls

We investigated the mechanisms leading to rapid death of corals when exposed to runoff and resuspended sediments, postulating that the killing was microbially mediated. Microsensor measurements were conducted in mesocosm experiments and in naturally accumulated sediment on corals. In organic-rich, but not in organic-poor sediment, pH and oxygen started to decrease as soon as the sediment accumulated on the coral. Organic-rich sediments caused tissue degradation within 1 d, whereas organic-poor sediments had no effect after 6 d. In the harmful organic-rich sediment, hydrogen sulfide concentrations were low initially but increased progressively because of the degradation of coral mucus and dead tissue. Dark incubations of corals showed that separate exposures to darkness, anoxia, and low pH did not cause mortality within 4 d. However, the combination of anoxia and low pH led to colony death within 24 h. When hydrogen sulfide was added after 12 h of anoxia and low pH, colonies died after an additional 3 h. We suggest that sedimentation kills corals through microbial processes triggered by the organic matter in the sediments, namely respiration and presumably fermentation and desulfurylation of products from tissue degradation. First, increased microbial respiration results in reduced O 2 and pH, initiating tissue degradation. Subsequently, the hydrogen sulfide formed by bacterial decomposition of coral tissue and mucus diffuses to the neighboring tissues, accelerating the spread of colony mortality. Our data suggest that the organic enrichment of coastal sediments is a key process in the degradation of coral reefs exposed to terrestrial runoff.

Mesocosm

Sedimentation

Microcosm

10.1073/pnas.1100715109

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Citations (246)

Large‐scale penetration of Gulf Stream water onto the Continental Shelf north of Cape Hatteras

Geophysical Research Letters (1992)

Glen Gawarkiewicz Thomas M. Church George W. Luther Timothy G. Ferdelman Michael J. Caruso

A hydrographic cruise on the continental shelf between Chesapeake Bay and Cape Hatteras on the east coast of the United States during the summer of 1990 revealed the presence of a large volume of Gulf Stream water. Gulf Stream water was observed on the shelf between the depths of 10 m to 30 m, and penetrated the shelfbreak front which normally separates the shelf water from slope water and Gulf Stream water. The layer of Gulf Stream water on the shelf extended 60 km north of Cape Hatteras, and reached at least as far shoreward as the 25 m isobath. Velocities of Gulf Stream water in the upper 110 m of the water column along the 1000 m isobath indicated a flow of 18 to 25 cm/s directed toward the northwest. The Gulf Stream water on the shelf was associated with low values of fluorescence, transmissivity, and nutrient concentrations relative to adjacent shelf water. The presence of the seasonal stratification during the summer may allow for mid‐level penetration of Gulf Stream water onto the continental shelf north of Cape Hatteras.

Gulf Stream

Cape

Stratification (seeds)

10.1029/92gl00225

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Citations (31)

Sulfate reduction rates in deeply, buried marine sediments

Jens Kallmeyer Timothy G. Ferdelman Bo Barker Jørgensen

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SiO 2 -rich metasomatizing agent in the Southern Patagonian lithospheric mantle

Geochimica et Cosmochimica Acta Supplement (2009)

Patrick Meister Sarah Freund Laura M. Wehrmann Benjamin Brunner Timothy G. Ferdelman

University Erlangen-Nurnberg, Geozentrum Nordbayern, Schlossgarten 5, 91056 Erlangen, Germany (sarahsfreund@web.de) The reductive dissolution of solid phase Fe-oxides is considered an important process in ocean sediments, however, the role of Fe as an electron acceptor remains poorly quantified. Reactions involving solid phase substrates are limited by dissolution kinetics but can significantly contribute to biogeochemical reactions in the deep biosphere over geological time scales. We report results from sequential Fe-extraction and solid phase S-distillation of sediment from a sequence drilled in the Eastern Equatorial Pacific (ODP Site 1226). These sediments contain a total of about 1 wt% solid phase Fe but only 10 % of it can be considered reactive (mainly ferrihydrite and lepidocrocite at this site). The degree of pyritization (DOP) with respect to reactive Fe is around 0.8 in the Fe-rich vs. 0.5 in the Fe-poor layers. Also, pyrite from the Fe-poor intervals shows about 10› more positive δ

Biogeochemical Cycle

Lepidocrocite

Ferrihydrite

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Carbon recycling efficiency and phosphate turnover by marine nitrifying archaea

Science Advances (2020)

Travis B. Meador Niels J. Schoffelen Timothy G. Ferdelman Osmond Rebello Alexander Khachikyan

Efficient thaumarchaeal chemoautotrophs recycle ~5% of remineralized C and P and release dissolved organics to the ocean.

Nitrifying Bacteria

Carbon fibers