A5060266476- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Soil and Water Nutrient Dynamics
- Wastewater Treatment and Nitrogen Removal
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Coastal wetland ecosystem dynamics
- Groundwater and Isotope Geochemistry
- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Fish Ecology and Management Studies
- Coastal and Marine Management
- Atmospheric chemistry and aerosols
- Protist diversity and phylogeny
- Peatlands and Wetlands Ecology
- Geological Studies and Exploration
- Hydrology and Watershed Management Studies
- Coral and Marine Ecosystems Studies
- Underwater Vehicles and Communication Systems
Leibniz Institute for Baltic Sea Research
2016-2025
University of Rostock
2001-2024
University of Wisconsin–Extension
2022
University of Wisconsin–Madison
2022
University of Utah
2022
Utah State University
2022
Texas A&M University
2008-2018
University of California, Los Angeles
2018
Mitchell Institute
2013-2018
Southern California University for Professional Studies
2018
We describe a simple, precise, and sensitive experimental protocol for direct measurement of N(inf2) fixation using the conversion (sup15)N(inf2) to organic N. Our greatly reduces limit detection by taking advantage high sensitivity modern, multiple-collector isotope ratio mass spectrometer. This instrument allowed natural assemblages plankton in incubations lasting several hours presence relatively low-level (ca. 10 atom%) tracer additions ambient pool N(inf2). The precision this method are...
ABSTR ACT
The ocean's nitrogen cycle is driven by complex microbial transformations, including fixation, assimilation, nitrification, anammox and denitrification. Dinitrogen the most abundant form of in sea water but only accessible nitrogen-fixing microbes. Denitrification nitrification are both regulated oxygen concentrations potentially produce nitrous oxide (N2O), a climate-relevant atmospheric trace gas. world's oceans, coastal areas upwelling areas, contribute about 30 per cent to N2O budget...
Hypoxia has occurred intermittently over the Holocene in Baltic Sea, but recent expansion from less than 10 000 km(2) before 1950 to >60 since 2000 is mainly caused by enhanced nutrient inputs land and atmosphere. With worsening hypoxia, role of sediments changes nitrogen removal release as ammonium. At present, denitrification water column equally important. Phosphorus currently buried organic form, with an additional contribution reduced Fe-phosphate minerals deep anoxic basins. Upon...
The use of stable isotopes to study food webs has increased rapidly, but there are still some uncertainties in their application. We examined the δ 15 N and 13 C values Antarctic euphausiids copepods from Polar Front, Lazarev Sea, Marguerite Bay against foodweb baseline particulate organic matter (POM). Interpretations trophic level were helped by comparison with other approaches calibration experiments Euphausia superba fed known diets. Results for well‐known mesozooplankters (e.g.,...
Abstract An important function of coastal ecosystems is the reduction nutrient flux from land to open sea, filter. In this study, we focused on two most biogeochemical processes that remove nitrogen and phosphorus permanently: denitrification burial. We compiled removal rates systems around Baltic Sea analyzed their spatial variation regulating environmental factors. These analyses were used scale up burial for entire zone. Denitrification ranged non‐detectable 12 mmol N m −2 d −1 ,...
Since the start of synthetic fertilizer production more than a hundred years ago, coastal ocean has been exposed to increasing nutrient loading, which led eutrophication and extensive algal blooms. Such hypereutrophic waters might harbor anaerobic nitrogen (N) cycling processes due low-oxygen microniches associated with abundant organic particles, but studies on nitrate reduction in pelagic environments are scarce. Here, we report 15N isotope-labeling experiments, metagenome, RT-qPCR data...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 214:1-14 (2001) - doi:10.3354/meps214001 Evidence of nitrogen fixation by non-heterocystous cyanobacteria in Baltic Sea and re-calculation a budget Norbert Wasmund*, Maren Voss, Karin Lochte Institut für Ostseeforschung Warnemünde, Postfach 301161, 18112 Rostock, Germany *E-mail:...
We studied the diet of Antarctic krill, Euphausia superba, at five stations across southwest Atlantic sector in summer 2003 by analyzing stomach content, fatty acids, and stable isotopes on same individuals. Our aim was to examine what each method could contribute our understanding krill nutrition whether differences seen growth rates were linked their food. All three methods indicated clear regional diet, but small ontogenetic sex-related differences. Overall, diatoms most abundant item...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 266:43-58 (2004) - doi:10.3354/meps266043 Trophic-level interpretation based on δ15N values: implications of tissue-specific fractionation and amino acid composition Katrin Schmidt1,5,*, James W. McClelland2,6, Eleni Mente3, Joseph P. Montoya2, Angus Atkinson4, Maren Voss1 1Institute for Baltic Sea Research...
Fowl adenoviruses were isolated and characterized from severe cases of hydropericardium syndrome in Ecuador Pakistan. All neutralized by antibodies against serotypes 4 11. Cross-neutralization tests restriction enzyme analysis strengthen the classification as serotype strains. The endonucleases used allowed differentiation among field isolates reference tested induced high embryo mortality. One-day-old specific pathogen free (SPF) chicks infected with 10(5) plaque-forming units natural...
Stable nitrogen isotope ratios ( 15 N/ 14 N; δ N) were determined in sediments, suspended matter, and water at selected sites the Baltic Sea area order to set up a source budget trace fate of anthropogenic N sources. Sediments shallow near‐coastal southern eastern have an average 7.3 ± 2.1‰, interpreted as characteristic residual delivered by rivers diffuse runoff. In contrast, values sediments deposited basins central are depleted (average 3.5 0.6‰), indicating significant contribution...
Abstract. Nitrate input to a river is largely controlled by land use in its catchment. We compared the information carried isotopic signatures of nitrate 12 Baltic rivers, relation vegetation cover, use, and fertilization agricultural their catchments. found isotope values ranging from −2 14‰ for δ15N 8 25‰ δ18O. The annual variability riverine presented detail one Nordic, Kemijoki, two southern Vistula Oder. Nordic rivers with relatively pristine catchments show not only low high δ18O-NO3−...