Peter Stief
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View article: Seasonal and stable heterotrophic guilds drive Arctic benthic microbiome functioning across polar day and night
Seasonal and stable heterotrophic guilds drive Arctic benthic microbiome functioning across polar day and night Open
The remineralization of organic matter by benthic bacteria is an essential process in the marine carbon cycle. In polar regions, strong variation in daylength causes pronounced seasonality in primary productivity, but the responses of sedi…
View article: Hydrostatic pressure impedes the degradation of sinking copepod carcasses and fecal pellets
Hydrostatic pressure impedes the degradation of sinking copepod carcasses and fecal pellets Open
Fast-sinking zooplankton carcasses and fecal pellets appear to contribute significantly to the vertical transport of particulate organic carbon (POC), partly because of low temperature that decreases microbial degradation during the descen…
View article: Hydrostatic pressure induces transformations in the organic matter and microbial community composition of marine snow particles
Hydrostatic pressure induces transformations in the organic matter and microbial community composition of marine snow particles Open
In the hadal zone of the ocean (6–11 km), the characteristics of sinking marine snow particles and their attached microbial communities remain elusive, despite their potential importance for benthic life thriving at extreme pressures (60–1…
View article: Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic
Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic Open
Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower trophic levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinet…
View article: ICNO3-Screening_Supplementary Data 2.docx
ICNO3-Screening_Supplementary Data 2.docx Open
Sampling sites for which diatom cell abundance and total diatom biovolume were determined
View article: Intracellular nitrate storage by diatoms - Source data
Intracellular nitrate storage by diatoms - Source data Open
Intracellular nitrate storage by diatoms can be an important nitrogen pool in freshwater and marine ecosystems Peter Stief, Clemens Schauberger, Marie B. Lund, Andreas Greve, Raeid M. M. Abed, Mohammad A. A. Al-Najjar, Karl Attard, Stefan…
View article: ICNO3-Screening_Supplementary Data 1.docx
ICNO3-Screening_Supplementary Data 1.docx Open
Sampling sites, collection method, and sample type
View article: ICNO3-Screening_Supplementary Data 3.docx
ICNO3-Screening_Supplementary Data 3.docx Open
Sampling sites for which diatom community composition was determined through 18S rRNA gene sequencing
View article: ICNO3-Screening_Supplementary Data 4.docx
ICNO3-Screening_Supplementary Data 4.docx Open
Intracellular nitrate storage capacity in different microalgal classes
View article: Temperature effects on carbon mineralization of sinking copepod carcasses
Temperature effects on carbon mineralization of sinking copepod carcasses Open
Copepod carcasses are prevalent in marine ecosystems and might represent an important component of the sinking flux of particulate organic carbon in the ocean. The extent to which copepod carcasses contribute to the biological carbon pump …
View article: Respiration by “marine snow” at high hydrostatic pressure: Insights from continuous oxygen measurements in a rotating pressure tank
Respiration by “marine snow” at high hydrostatic pressure: Insights from continuous oxygen measurements in a rotating pressure tank Open
It is generally anticipated that particulate organic carbon (POC) for most part is degraded by attached microorganisms during the descent of “marine snow” aggregates toward the deep sea. There is, however, increasing evidence that fresh ag…
View article: Feeding-related controls on microbial nitrogen cycling associated with the Arctic marine copepod Calanus hyperboreus
Feeding-related controls on microbial nitrogen cycling associated with the Arctic marine copepod Calanus hyperboreus Open
The copepod Calanus hyperboreus, a key species of Arctic marine ecosystems, has a partially anoxic gut that is suspected to host anaerobic microbial activities. So far, however, only dead specimens have been studied in which gut processes …
View article: Freshwater copepod carcasses as pelagic microsites of dissimilatory nitrate reduction to ammonium
Freshwater copepod carcasses as pelagic microsites of dissimilatory nitrate reduction to ammonium Open
A considerable fraction of freshwater zooplankton was recently found to consist of dead specimens that sink to the lake bottom. Such carcasses host intense microbial activities that may promote oxygen depletion at the microscale. Therefore…
View article: Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms
Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms Open
Intracellular nitrate is an important electron acceptor in oxygen-deficient aquatic environments, either for the nitrate-storing microbes themselves, or for ambient microbial communities through nitrate leakage. This study links the spatia…
View article: Editorial: Eukaryotic Microbes Store Nitrate for “Breathing” in Anoxia
Editorial: Eukaryotic Microbes Store Nitrate for “Breathing” in Anoxia Open
EDITORIAL article Front. Microbiol., 07 December 2017Sec. Aquatic Microbiology Volume 8 - 2017 | https://doi.org/10.3389/fmicb.2017.02439
View article: Effect of settled diatom‐aggregates on benthic nitrogen cycling
Effect of settled diatom‐aggregates on benthic nitrogen cycling Open
The marine sediment hosts a mosaic of microhabitats. Recently it has been demonstrated that the settlement of phycodetrital aggregates can induce local changes in the benthic O 2 distribution due to confined enrichment of organic material …
View article: Fixed-Nitrogen Loss Associated with Sinking Zooplankton Carcasses in a Coastal Oxygen Minimum Zone (Golfo Dulce, Costa Rica)
Fixed-Nitrogen Loss Associated with Sinking Zooplankton Carcasses in a Coastal Oxygen Minimum Zone (Golfo Dulce, Costa Rica) Open
Oxygen minimum zones (OMZs) in the ocean are of key importance for pelagic fixed-nitrogen loss (N-loss) through microbial denitrification and anaerobic ammonium oxidation (anammox). Recent studies document that zooplankton is surprisingly …
View article: Copepod swimming behavior, respiration, and expression of stress-related genes in response to high stocking densities
Copepod swimming behavior, respiration, and expression of stress-related genes in response to high stocking densities Open
Using copepod nauplii as live feed in aquaculture hatcheries could solve high mortality rates of first-feeding fish larvae due to malnutrition. However, implementing the use of copepod nauplii on an intensive production scale requires a st…
View article: Nitrogen cycling and bacterial community structure of sinking and aging diatom aggregates
Nitrogen cycling and bacterial community structure of sinking and aging diatom aggregates Open
Sinking phycodetrital aggregates can contribute to anaerobic nitrogen turnover as they may represent oxygen-depleted microbial hot spots in otherwise oxygenated waters. However, the dynamics of anaerobic nitrogen cycling during the long de…
View article: Intracellular Nitrate of Marine Diatoms as a Driver of Anaerobic Nitrogen Cycling in Sinking Aggregates
Intracellular Nitrate of Marine Diatoms as a Driver of Anaerobic Nitrogen Cycling in Sinking Aggregates Open
Diatom-bacteria aggregates are key for the vertical transport of organic carbon in the ocean. Sinking aggregates also represent pelagic microniches with intensified microbial activity, oxygen depletion in the center, and anaerobic nitrogen…
View article: Direct Nitrous Oxide Emission from the Aquacultured Pacific White Shrimp (Litopenaeus vannamei)
Direct Nitrous Oxide Emission from the Aquacultured Pacific White Shrimp (Litopenaeus vannamei) Open
The Pacific white shrimp ( Litopenaeus vannamei ) is widely used in aquaculture, where it is reared at high stocking densities, temperatures, and nutrient concentrations. Here we report that adult L. vannamei shrimp emit the greenhouse gas…
View article: Anaerobic Nitrogen Turnover by Sinking Diatom Aggregates at Varying Ambient Oxygen Levels
Anaerobic Nitrogen Turnover by Sinking Diatom Aggregates at Varying Ambient Oxygen Levels Open
In the world's oceans, even relatively low oxygen levels inhibit anaerobic nitrogen cycling by free-living microbes. Sinking organic aggregates, however, might provide oxygen-depleted microbial hotspots in otherwise oxygenated surface wate…
View article: Appendix A. Detailed description of PCLake.
Appendix A. Detailed description of PCLake. Open
Detailed description of PCLake.
View article: Appendix B. Relative contribution of NH4+ excretion, grazing on nitrifying bacteria, and respiration by C. riparius larvae to NH4+, O2, and CO2 fluxes across the sediment–water interface.
Appendix B. Relative contribution of NH4+ excretion, grazing on nitrifying bacteria, and respiration by C. riparius larvae to NH4+, O2, and CO2 fluxes across the sediment–water interface. Open
Relative contribution of NH4+ excretion, grazing on nitrifying bacteria, and respiration by C. riparius larvae to NH4+, O2, and CO2 fluxes across the sediment–water interface.