A5043976276- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Protist diversity and phylogeny
- Cassava research and cyanide
- Pharmaceutical and Antibiotic Environmental Impacts
- Marine Ecology and Invasive Species
- Environmental Toxicology and Ecotoxicology
- Marine Biology and Environmental Chemistry
- Indigenous Studies and Ecology
- Nuclear Physics and Applications
- Calcium Carbonate Crystallization and Inhibition
- Arctic and Russian Policy Studies
- Environmental DNA in Biodiversity Studies
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Mass Spectrometry Techniques and Applications
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- European and International Law Studies
- Ocean Acidification Effects and Responses
- Microplastics and Plastic Pollution
- Radioactive element chemistry and processing
- Marine Bivalve and Aquaculture Studies
Norwegian Institute for Water Research
2009-2024
University of Oslo
1987-1993
Bacterivory in obligate phototrophic algal flagellates may be an important strategy for acquiring nutrients during periods of inorganic nutrient limitation. Several marine were shown to increase bactivory when phosphate was limited. Grazing on bacteria by found blooms Prymnesium parvum Sandsfjorden, western Norway, 1989 and Chrysochromulina polylepis the south west coast Norway 1988. Dissolved not detectable these situations. Algal graze obtain phosphate, which permit develop becomes
Disinfection of microbes is importance to prevent the spread pathogens and non-indigenous species in environment. Here we test applicability using flow cytometry (FCM) evaluate inactivation phytoplankter Tetraselmis suecica after UV irradiation labeling with esterase substrate 5-carboxyfluorescein diacetate acetoxymethyl ester (CFDA-AM). Non-irradiated irradiated samples were analyzed plate count technique FCM for 24 days. The numbers colony forming units used as a standard develop protocol....
The ability to quantify vital aquatic organisms in the 2–50 µm size range was compared between five different flow cytometers and several microscopes. Counts of calibration beads, algal monocultures sizes as well a Wadden Sea sample were compared. Flow microscopes delivered bead concentrations. These differences instruments became larger for even higher sample. It observed that concentration significant cytometer microscope counts, this difference increased with objects counted. Microscope...
Abstract Chrysochromulina polylepis caused in the spring of 1988 one most severe toxic blooms Kat-tegat/Skagerrak area ever recorded. Though bloom was not massive terms biomass its unialgal nature indicated that it had a strong and unspecific toxin. Microscopy did reveal any likely predators on C. polylepis. However adding sample from water second stage chemostat with first gave growth heliozpan Heterophrys marina which grew well Growth studies were performed cell culture chambers. Maximal...
Abstract. Increasing the marine carbon dioxide (CO2) absorption capacity by adding alkaline minerals into world's oceans is a promising removal (mCDR) approach to increase ocean's CO2 storage potential and mitigate ocean acidification. Still, biological impacts of dispersion need be evaluated prior its field deployment, especially initial discharge causing local temporary extreme alkalinity/pH changes. In this study, toxicity effect on microalgae two commonly used minerals, calcium hydroxide...
Journal Article The succession of microheterotrophs and phytoplankton within the microbial loop in Oslofjorden, May-October 1984 Get access August Tobiesen Marine Botany Section, Department Biology, University OsloPO Box 1069 Blindern, N-0316 Oslo 3, Norway Search for other works by this author on: Oxford Academic Google Scholar Plankton Research, Volume 13, Issue 1, 1991, Pages 197–216, https://doi.org/10.1093/plankt/13.1.197 Published: 01 January 1991 history Received: 09 March 1990...
Abstract The uptake rates of nitrate and ammonium at six depths one station in Oslofjorden were measured on eleven dates by means the 15N-isotope method. Other variables concentration, light extinction irradiance, tempearture, salinity, phytoplankton composition biomass, mean cell volume, chlorophyll a, particulate nitrogen. Ammonium was more important N-nutrient summer 0, 2, 4 m depths, while dominant 6, 8, 16 winter. There no clear indication N-limitation any sampling dates. Statistical...