A5042041621- Microbial Community Ecology and Physiology
- Methane Hydrates and Related Phenomena
- Wastewater Treatment and Nitrogen Removal
- Genomics and Phylogenetic Studies
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Water Treatment and Disinfection
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Epigenetics and DNA Methylation
- Paranormal Experiences and Beliefs
- Ammonia Synthesis and Nitrogen Reduction
- Bacteriophages and microbial interactions
- Geological Studies and Exploration
- Aquatic Invertebrate Ecology and Behavior
- Biofield Effects and Biophysics
- Protist diversity and phylogeny
- Infant Nutrition and Health
- Marine Biology and Ecology Research
- Gut microbiota and health
- Magnetic and Electromagnetic Effects
- Geology and Paleoclimatology Research
- Microbial Fuel Cells and Bioremediation
- Marine Bivalve and Aquaculture Studies
University of Southern Denmark
2021-2024
University of Vienna
2016-2017
Nitrification, the oxidation of ammonia via nitrite to nitrate, has always been considered be catalyzed by concerted activity ammonia- and nitrite-oxidizing microorganisms. Only recently, complete oxidizers ('comammox'), which oxidize nitrate on their own, were identified in bacterial genus Nitrospira, previously assumed contain only canonical oxidizers. Nitrospira are widespread nature, but for assessments distribution functional importance comammox ecosystems, cultivation-independent tools...
Hadal trench sediments are hotspots of biogeochemical activity in the deep sea, but and ecological factors that shape benthic hadal microbial communities remain unknown. Here, we sampled ten sites from two regions with a vertical resolution down to 1 cm. We sequenced 16S rRNA gene amplicons using universal archaea-specific primer sets compared results parameters. Despite bathymetric depositional heterogeneity found high similarity within each axes, while composition at phylum level varied...
Abstract Identifying and quantifying nitrogen pools is essential for understanding the cycle in aquatic ecosystems. The ubiquitous diatoms represent an overlooked nitrate pool as they can accumulate intracellularly utilize it assimilation, dissipation of excess photosynthetic energy, Dissimilatory Nitrate Reduction to Ammonium (DNRA). Here, we document global co-occurrence intracellular phototrophic microbial communities freshwater ( n = 69), coastal 44), open marine 4) habitats. Diatom...
Significance Hadal trenches represent the deepest part of oceans, apparently offering adverse conditions for life, given their high hydrostatic pressure and wide separation from productive surface waters. However, focusing reactive organic matter in trench axis sediments potentially promotes complex yet unexplored microbial communities associated biogeochemical processes. We demonstrate that hadal at depths reaching 10 km are hotbeds anaerobic nitrogen transformations, dominated by anammox...
Abstract Hadal trenches represent the deepest part of ocean and are dynamic depocenters with intensified prokaryotic activity. Here, we explored distribution drivers viral abundance from surface 40 cm into sediments in two hadal trench regions contrasting productivity. In water column, decreased depth before reaching a rather stable level at ~ 4000 m both systems, while virus to prokaryote ratios were increasing depth, presumably reflecting declining availability organic material....
Abstract Hadal sediments are hotspots of microbial activity in the deep sea and exhibit strong biogeochemical gradients. But although these gradients widely assumed to exert selective forces on hadal communities, actual relationship between biogeochemistry, functional traits, community structure remains poorly understood. We tested whether conditions select for microbes based their genomic capacity respiration carbohydrate utilization via a metagenomic analysis over 153 samples from Atacama...
Shallow coastal waters are dynamic environments that dominate global marine methane emissions. Particularly high concentrations found in seasonally anoxic waters, which spreading eutrophic systems, potentially leading to increased emissions the atmosphere. Here we explore how seasonal development of anoxia influenced concentrations, rates oxidation, and community composition methanotrophs shallow water column Mariager Fjord, Denmark. Our results show steep concentration gradients toward...
Abstract In the hadal zone of ocean (6–11 km), characteristics sinking marine snow particles and their attached microbial communities remain elusive, despite potential importance for benthic life thriving at extreme pressures (60–110 MPa). Here, we used simulation experiments to explore how increasing pressure levels modify degradation, organic matter composition, microbiome diatom aggregates. Individual aggregates were incubated in rotating tanks which was incrementally increased simulate a...
Our knowledge concerning the initial gut microbiome assembly in human neonates is limited, and scientific progression this interdisciplinary field hindered due to individuality composition of microbiota. study addresses ecological processes that result observed microbes gastrointestinal tract between extremely premature term-born infants.
Ammonia-oxidizing archaea of the phylum Thaumarchaeota play a central role in biogeochemical cycling nitrogen benthic sediments, at interface between pelagic and subsurface ecosystems. However, our understanding their niche separation processes controlling population structure hadal abyssal surface sediments is still limited. Here, we reconstructed 47 AOA metagenome-assembled genomes (MAGs) from Atacama Kermadec trench systems. They formed deep-sea-specific groups within family...
Coastal waters are a major source of marine methane to the atmosphere. Particularly high concentrations this potent greenhouse gas found in anoxic waters, but it remains unclear if and what extent anaerobic methanotrophs mitigate flux. Here we investigate long-term dynamics methanotrophic activity methanotroph community coastal oxygen minimum zone (OMZ) Golfo Dulce, Costa Rica, combining biogeochemical analyses, experimental incubations 16S rRNA gene sequencing over 3 consecutive years. Our...
Microbial communities in marine sediments are highly diverse, yet the processes that give rise to this complexity unclear. It has been proposed benthic microbial must be continuously re-seeded from water column because dispersal within sediment is severely limited. Previous studies consistently report composition of community gradually changes with depth. However, relative contributions underlie these compositional gradients have not determined, and it unknown whether indeed too slow outpace...
Abstract Nitrification, the oxidation of ammonia via nitrite to nitrate, has always been considered be catalyzed by concerted activity ammonia- and nitrite-oxidizing microorganisms. Only recently, complete oxidizers (‘comammox’), which oxidize nitrate on their own, were identified in bacterial genus Nitrospira , previously known contain only canonical oxidizers. are widespread nature, but for assessments distribution functional importance comammox ecosystems cultivation-independent tools...
Abstract Microbial exopolymeric substances (EPSs) form the organic, polysaccharide-rich matrix of marine microbial mats and can mediate binding precipitation carbonate minerals therein. Here, we investigate molecular ecology carbohydrate degradation production in pustular from Shark Bay, Western Australia, by analyzing 84 metagenome-assembled genomes (MAGs) composition communities enriched a mat on various polysaccharide substrates. The annotation 4000 genes hundreds carbohydrate-active...