Steffen L. Jørgensen
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View article: Environmental consequences of sulphide-ore tailing disposal in freshwater bodies: A case study of Storavatnet at Litlabø, western Norway
Environmental consequences of sulphide-ore tailing disposal in freshwater bodies: A case study of Storavatnet at Litlabø, western Norway Open
View article: Iron Oxyhydroxide‐Rich Hydrothermal Deposits at the High‐Temperature Fåvne Vent Field, Mohns Ridge
Iron Oxyhydroxide‐Rich Hydrothermal Deposits at the High‐Temperature Fåvne Vent Field, Mohns Ridge Open
The recently discovered Fåvne vent field, located at 3,040 m depth on the slow‐spreading Mohns mid‐ocean ridge between Greenland and Norway, is a high‐temperature (≥250°C) vent field that is characterized by Fe oxyhydroxide‐rich and S‐poor…
View article: An abundant bacterial phylum with nitrite-oxidizing potential in oligotrophic marine sediments
An abundant bacterial phylum with nitrite-oxidizing potential in oligotrophic marine sediments Open
Nitrite-oxidizing bacteria (NOB) are important nitrifiers whose activity regulates the availability of nitrite and dictates the magnitude of nitrogen loss in ecosystems. In oxic marine sediments, ammonia-oxidizing archaea (AOA) and NOB tog…
View article: Hydrothermal activity fuels microbial sulfate reduction in deep and distal marine settings along the Arctic Mid Ocean Ridges
Hydrothermal activity fuels microbial sulfate reduction in deep and distal marine settings along the Arctic Mid Ocean Ridges Open
Microbial sulfate reduction is generally limited in the deep sea compared to shallower marine environments, but cold seeps and hydrothermal systems are considered an exception. Here, we report sulfate reduction rates and geochemical data f…
View article: A new abundant nitrite-oxidizing phylum in oligotrophic marine sediments
A new abundant nitrite-oxidizing phylum in oligotrophic marine sediments Open
Nitrite-oxidizing bacteria (NOB) are important nitrifiers whose activity regulates the availability of nitrite and links reduced ammonium and oxidized nitrate in ecosystems. In oxic marine sediments, ammonia-oxidizing archaea (AOA) and NOB…
View article: Nitrite accumulation and anammox bacterial niche partitioning in Arctic Mid-Ocean Ridge sediments
Nitrite accumulation and anammox bacterial niche partitioning in Arctic Mid-Ocean Ridge sediments Open
By consuming ammonium and nitrite, anammox bacteria form an important functional guild in nitrogen cycling in many environments, including marine sediments. However, their distribution and impact on the important substrate nitrite has not …
View article: Structure and metabolic potential of the prokaryotic communities from the hydrothermal system of Paleochori Bay, Milos, Greece
Structure and metabolic potential of the prokaryotic communities from the hydrothermal system of Paleochori Bay, Milos, Greece Open
Introduction Shallow hydrothermal systems share many characteristics with their deep-sea counterparts, but their accessibility facilitates their study. One of the most studied shallow hydrothermal vent fields lies at Paleochori Bay off the…
View article: Production and Destruction of Novel Organic Species during simulated Hydrothermal Alteration of Seafloor Sediment
Production and Destruction of Novel Organic Species during simulated Hydrothermal Alteration of Seafloor Sediment Open
View article: Occurrence, Diversity, and Genomes of “ <i>Candidatus</i> Patescibacteria” along the Early Diagenesis of Marine Sediments
Occurrence, Diversity, and Genomes of “ <i>Candidatus</i> Patescibacteria” along the Early Diagenesis of Marine Sediments Open
Ultrasmall-celled “ Ca. Patescibacteria” have been estimated to account for one-quarter of the total microbial diversity on Earth, the parasitic lifestyle of which may exert a profound control on the overall microbial population size of th…
View article: Nitrite accumulation and the associated anammox bacteria niche partitioning in marine sediments
Nitrite accumulation and the associated anammox bacteria niche partitioning in marine sediments Open
By consuming ammonium and nitrite, anammox bacteria form an important functional guild in nitrogen cycling in many environments including marine sediments. Recent studies have shown that anammox bacteria can consume most of the upwardly di…
View article: Introducing <i>Candidatus</i> Bathyanammoxibiaceae, a family of bacteria with the anammox potential present in both marine and terrestrial environments
Introducing <i>Candidatus</i> Bathyanammoxibiaceae, a family of bacteria with the anammox potential present in both marine and terrestrial environments Open
Anaerobic ammonium oxidation (Anammox) bacteria are a group of extraordinary bacteria exerting a major impact on the global nitrogen cycle. Their phylogenetic breadth and diversity, however, are not well constrained. Here we describe a new…
View article: Mapping Microbial Abundance and Prevalence to Changing Oxygen Concentration in Deep-Sea Sediments Using Machine Learning and Differential Abundance
Mapping Microbial Abundance and Prevalence to Changing Oxygen Concentration in Deep-Sea Sediments Using Machine Learning and Differential Abundance Open
Oxygen constitutes one of the strongest factors explaining microbial taxonomic variability in deep-sea sediments. However, deep-sea microbiome studies often lack the spatial resolution to study the oxygen gradient and transition zone beyon…
View article: Measurements of the inclination of the SE-03 Borehole on Surtsey Volcano
Measurements of the inclination of the SE-03 Borehole on Surtsey Volcano Open
The inclined SE-03 borehole drilled in 2017 provides a unique opportunity to further examine the stratigraphy and submarine structure of Surtsey. The borehole was drilled towards west (azimuth 264°) with inclination of 35° from vertical. D…
View article: Ammonia-oxidizing archaea have similar power requirements in diverse marine oxic sediments
Ammonia-oxidizing archaea have similar power requirements in diverse marine oxic sediments Open
Energy/power availability is regarded as one of the ultimate controlling factors of microbial abundance in the deep biosphere, where fewer cells are found in habitats of lower energy availability. A critical assumption driving the proporti…
View article: Shallow-water hydrothermalism at Milos (Greece): Nature, distribution, heat fluxes and impact on ecosystems
Shallow-water hydrothermalism at Milos (Greece): Nature, distribution, heat fluxes and impact on ecosystems Open
View article: Genomes of Thaumarchaeota from deep sea sediments reveal specific adaptations of three independently evolved lineages
Genomes of Thaumarchaeota from deep sea sediments reveal specific adaptations of three independently evolved lineages Open
Marine sediments represent a vast habitat for complex microbiomes. Among these, ammonia oxidizing archaea (AOA) of the phylum Thaumarchaeota are one of the most common, yet little explored, inhabitants, which seem extraordinarily well adap…
View article: Ammonia-oxidizing archaea have similar power requirements indiverse marine oxic sediments
Ammonia-oxidizing archaea have similar power requirements indiverse marine oxic sediments Open
View article: Geochemical transition zone powering microbial growth in subsurface sediments
Geochemical transition zone powering microbial growth in subsurface sediments Open
Significance The marine sedimentary subsurface is a vast and inhospitable ecosystem, often described as a place where microbes “race to their death,” as microbial cells are buried and available energy is severely diminished with increasing…
View article: Chlamydial contribution to anaerobic metabolism during eukaryotic evolution
Chlamydial contribution to anaerobic metabolism during eukaryotic evolution Open
Genomic analysis of newly identified Chlamydiae reveals that their ancestors contributed to the evolution of anaerobic eukaryotes.
View article: Presentation_1_Microbial Community Structure in Arctic Lake Sediments Reflect Variations in Holocene Climate Conditions.pdf
Presentation_1_Microbial Community Structure in Arctic Lake Sediments Reflect Variations in Holocene Climate Conditions.pdf Open
The reconstruction of past climate variability using physical and geochemical parameters from lake sedimentary records is a well-established and widely used approach. These geological records are also known to contain large and active micr…
View article: Microbial Community Structure in Arctic Lake Sediments Reflect Variations in Holocene Climate Conditions
Microbial Community Structure in Arctic Lake Sediments Reflect Variations in Holocene Climate Conditions Open
The reconstruction of past climate variability using physical and geochemical parameters from lake sedimentary records is a well-established and widely used approach. These geological records are also known to contain large and active micr…
View article: Genomes of Thaumarchaeota from deep sea sediments reveal specific adaptations of three independently evolved lineages
Genomes of Thaumarchaeota from deep sea sediments reveal specific adaptations of three independently evolved lineages Open
Marine sediments represent a vast habitat for complex microbiomes. Among these, ammonia oxidizing archaea (AOA) of the phylum Thaumarchaeota are one of the most common, yet little explored inhabitants, that seem extraordinarily well adapte…
View article: Surface reaction kinetics of volcanic materials at hydrothermal conditions &#8211; an in-situ experiment at the Surtsey volcano
Surface reaction kinetics of volcanic materials at hydrothermal conditions – an in-situ experiment at the Surtsey volcano Open
<p><strong>Surface reaction kinetics of volcanic materials at hydrothermal conditions – an in-situ experiment at the Surtsey volcano</strong></p><p>The diversity and functioning of microbial life is …
View article: Integrated regional scale view of Milos submarine hydrothermalism
Integrated regional scale view of Milos submarine hydrothermalism Open
<p>Submarine hydrothermal activity is common at the flanks of volcanic islands, and in some cases, occurring at very shallow water (0-100 meter depth). These sites are a key target for systematic seafloor mapping to understand the lo…
View article: Indigenous Ammonia-Oxidizing Archaea in Oxic Subseafloor Oceanic Crust
Indigenous Ammonia-Oxidizing Archaea in Oxic Subseafloor Oceanic Crust Open
Ridge flanks represent the major avenue of chemical and heat exchange between the Earth’s oceans and the lithosphere and are thought to harbor an enormous and understudied biosphere. However, little is known about the diversity and functio…
View article: Marine Sediments Illuminate Chlamydiae Diversity and Evolution
Marine Sediments Illuminate Chlamydiae Diversity and Evolution Open
View article: Evaluation of a new probiotic concept for broilers
Evaluation of a new probiotic concept for broilers Open
SUMMARY Probiotics were introduced as a spray directly in the hatcher when chickens started to leave the eggs which potentially could reduce the horizontal transmission and colonization with pathogenic bacteria. The single introduction of …
View article: <i>In situ</i>growth of anammox bacteria in subseafloor sediments
<i>In situ</i>growth of anammox bacteria in subseafloor sediments Open
The deep biosphere buried in marine sediments was estimated to host an equal number of microbes as found in the above oceans 1 . It has been debated if these cells are alive and active 2 , and their per cell energy availability does not se…
View article: Nitrifier abundance and diversity peak at deep redox transition zones
Nitrifier abundance and diversity peak at deep redox transition zones Open
View article: Design of the subsurface observatory at Surtsey volcano, Iceland
Design of the subsurface observatory at Surtsey volcano, Iceland Open
Surtsey, the youngest of the islands of Vestmannaeyjar, is an oceanic volcano created by explosive basaltic eruptions during 1963–1967 off the southern coast of Iceland. The subsurface deposits of the volcano were first sampled by a cored …