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Publications
Publications (10)
Increasing the marine carbon dioxide (CO2) absorption capacity by adding alkaline minerals into the world's oceans is a promising marine carbon dioxide removal (mCDR) approach to increase the ocean's CO2 storage potential and mitigate ocean acidification. Still, the biological impacts of dispersion of alkaline minerals need to be evaluated prior to...
Egge E, Deininger A, Bekkby T, Eikrem W, Mengeot C, Frigstad H, Moyano M, Kvile KØ, Baur AK, Tobiesen A, Harvey TE, Saesin P. 2023. Økokyst - DP Norskehavet sør, Årsrapport 2022. NIVA-rapport 7898, Miljødirektoratet rapport 2595. ISBN: 978-82-577-7634-3
The ability to quantify vital aquatic organisms in the 2–50 µm size range was compared between five different flow cytometers and several different microscopes. Counts of calibration beads, algal monocultures of different sizes as well as organisms in a Wadden Sea sample were compared. Flow cytometers and microscopes delivered different bead concen...
Disinfection of microbes is of importance to prevent the spread of pathogens and non-indigenous species in the environment. Here we test the applicability of using flow cytometry (FCM) to evaluate inactivation of the phytoplankter Tetraselmis suecica after UV irradiation and labeling with the esterase substrate 5-carboxyfluorescein diacetate acetox...
Since 2005, five different ballast water management systems (BWMSs) based on chlorination treatment have been tested by Norwegian Institute for Water Research (NIVA) according to guidelines from the International Maritime Organization (IMO). 25% and >50% of all the tested discharge samples exhibited acute and chronic toxic effects on algae, respect...
Approximately 460,000 ton of rubber are dispersed annually along the European roads due to tire wear. Tire rubber is known to leach compounds that are toxic to aquatic organisms. However, the potential effects of tire wear material on aquatic organisms at environmental relevant concentrations, and over time have so far not been extensively studied....
Bacterivory in obligate phototrophic algal flagellates may be an important strategy for acquiring nutrients during periods of inorganic nutrient limitation. Several marine algal flagellates were shown to increase bactivory when phosphate was limited. Grazing on bacteria by algal flagellates was found during blooms of Prymnesium parvum in Sandsfjord...
Chrysochromulina polylepis caused in the spring of 1988 one of the most severe toxic blooms in the Kat-tegat/Skagerrak area ever recorded. Though the bloom was not massive in terms of biomass its unialgal nature indicated that it had a strong and unspecific toxin. Microscopy did not reveal any likely predators on C. polylepis. However adding a samp...
The relative proportions of autotrophs, heterotrophic protozoa and bacteria were studied by epifluorescence microscopy at
three depths in Oslofjorden Cell volume estimates allowed direct comparison of groups. Analyses of size frequency showed heterotrophic
dinoflagellates to be an important member of the microbial loop In the period August-Septembe...
The uptake rates of nitrate and ammonium at six depths at one station in Oslofjorden were measured on eleven dates by means of the 15N-isotope method. Other measured variables were nitrate and ammonium concentration, light extinction and irradiance, tempearture, salinity, phytoplankton composition and biomass, mean cell volume, chlorophyll a, and p...
