A5015555004- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Wastewater Treatment and Nitrogen Removal
- Freezing and Crystallization Processes
- Polar Research and Ecology
- Marine and fisheries research
- Marine animal studies overview
- Aquaculture Nutrition and Growth
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Environmental DNA in Biodiversity Studies
- Climate change and permafrost
- Marine and Coastal Research
- Algal biology and biofuel production
- Marine Biology and Ecology Research
- Meteorological Phenomena and Simulations
- Food Industry and Aquatic Biology
- COVID-19 impact on air quality
- Crustacean biology and ecology
- Sustainability and Ecological Systems Analysis
University of Bergen
2020-2024
Norwegian Polar Institute
2016-2021
Aalborg University
2020
Norwegian University of Science and Technology
2002-2015
Oak Ridge National Laboratory
2004
Abstract The Arctic icescape is rapidly transforming from a thicker multiyear ice cover to thinner and largely seasonal first-year with significant consequences for primary production. One critical challenge understand how productivity will change within the next decades. Recent studies have reported extensive phytoplankton blooms beneath ponded sea during summer, indicating that satellite-based annual production estimates may be significantly underestimated. Here we present unique...
AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 2:267-283 (2012) - DOI: https://doi.org/10.3354/aei00044 REVIEW Discharge of nutrient wastes from salmon farms: environmental effects, and potential for integrated multi-trophic aquaculture Xinxin Wang1,*, Lasse Mork Olsen1, Kjell Inge Reitan2, Yngvar Olsen1 1Trondheim Biological Station, Department...
During the N-ICE2015 drift expedition north-west of Svalbard, we observed establishment and development algal communities in first-year ice (FYI) ridges at snow-ice interface. Despite some indications being hot spots for biological activity, are under-studied largely because they complex structures that difficult to sample. Snow infiltration can grow interface when flooded. They have been commonly Antarctic, but rarely Arctic, where flooding is less common mainly due a lower snow-to-ice...
The decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude composition phytoplankton production with cascading effects on marine food-webs biogeochemical cycles. Here, we elucidate environmental drivers shaping composition, abundance, biomass, trophic state vertical flux protists (unicellular eukaryotes), including phytoplankton, Barents Sea late August 2018 2019. two years were characterized by contrasting conditions. In...
During the Norwegian young sea ICE expedition (N-ICE2015) from January to June 2015 pack ice in Arctic Ocean north of Svalbard was studied during four drifts between 83° and 80°N. This consisted a mix second year, first ice. The physical properties algal community composition investigated three different types winter-spring-summer transition. Our results indicate that algae remaining survived summer melt season are subsequently trapped upper layers column winter may function as an seed...
The large declines in Arctic sea-ice age and extent over the last decades could have altered diversity of associated unicellular eukaryotes (referred to as protists). A time series from Russian ice drift stations 1980s 2010s revealed changes community composition protists central Ocean. However, these observations been biased by varying levels taxonomic resolution sampling effort, both which were higher early years at on multiyear sea (MYI) We here combine ice-drift station data with more...
Phytoplankton blooms in the Arctic Ocean's seasonal sea ice zone are expected to start earlier and occur further north with retreating thinning cover. The current study is first compilation of phytoplankton bloom development fate seasonally variable Svalbard from winter late summer, using short-term sediment trap deployments. Clear patterns were discovered, low pre-bloom standing stocks export fluxes, a short intense productive season May June, Chl but moderate carbon fluxes autumn...
Abstract The Arctic Ocean is rapidly changing from thicker multiyear to thinner first‐year ice cover, with significant consequences for radiative transfer through the pack and light availability algal growth. A thinner, more dynamic cover will possibly result in frequent leads, covered by newly formed little snow cover. We studied a refrozen lead (≤0.27 m ice) drifting north of Svalbard (80.5–81.8°N) May–June 2015 during Norwegian young sea ICE expedition (N‐ICE2015). measured downwelling...
Short-term temperature effects on photosynthesis were investigated by measuring O2 production, PSII-fluorescence kinetics, and (14) C-incorporation rates in monocultures of the marine phytoplankton species Prorocentrum minimum (Pavill.) J. Schiller (Dinophyceae), Prymnesium parvum f. patelliferum (J. C. Green, D. Hibberd et Pienaar) A. Larsen (Coccolithophyceae), Phaeodactylum tricornutum Bohlin (Bacillariophyceae), grown at 15°C 80 μmol photons · m(-2) s(-1) . Photosynthesis versus...
A total of 335 free-swimming puerulus stage larvae Panulirus longipes* were observed during five nights, using underwater lights, at Seven Mile Beach (29� 10'S., 114� 53'E.) in Western Australia. All found to be swimming alone and no contacts or reactions between individuals. Both the sinking postures are described. Swimming speeds approximately 33 cm/s (maximum) 15 (mean) recorded over a distance 1 m. Animals able swim these against water currents 9 13 cm/s, indicating potential speed with...
The importance of newly formed sea ice in spring is likely to increase with formation leads a more dynamic Arctic icescape. We followed the algal species succession young (≤0.27 m) at high temporal resolution (sampling every second day for one month May–June 2015) Ocean north Svalbard. document early development community based on abundance and chemotaxonomic marker pigments, relate young-ice communities under-ice water column surrounding older ice. seeding source seemed vary between groups....
In high altitude environments, extreme levels of solar radiation and important differences ionic concentrations over narrow spatial scales may modulate microbial activity. Salar de Huasco, a high-altitude wetland in the Andean mountains, diversity communities has been characterized associated with strong environmental variability. Communities that differed light history conditions, such as nutrient salinity from different locations, were assessed for bacterial secondary production...
Climate change related alterations in the Arctic have influences on marine ecosystems, particular phytoplankton bloom dynamics. Since blooms are main provider of carbon sources to microbial loop, bacterial and archaeal community affected by changes as well. Warmer water less sea ice can lead an earlier onset consequently also dynamics throughout summers. Here, we compared composition during three summers (2018, 2019, 2021) along a transect from Barents Sea Ocean north Svalbard. We used 16S...
Large changes in the sea ice regime of Arctic Ocean have occurred over last decades justifying development models to forecast physics and biogeochemistry. The main goal this study is evaluate performance Los Alamos Sea Ice Model (CICE) simulate physical biogeochemical properties at time scales a few weeks use model analyze algal bloom dynamics different types ice. atmospheric forcing data observations evolution collected from 18 April 4 June 2015, during Norwegian young ICE expedition, were...
The international and interdisciplinary sea-ice drift expedition “The Multidisciplinary drifting Observatory for the Study of Arctic Climate” (MOSAiC) was conducted from October 2019 to September 2020. aim MOSAiC study interconnected physical, chemical, biological characteristics processes atmosphere deep sea central system. ecosystem team addressed current knowledge gaps explored unknown properties over a complete seasonal cycle focusing on three major research areas: biodiversity,...
AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 9:21-32 (2017) - DOI: https://doi.org/10.3354/aei00212 Responses in bacterial community structure waste nutrients from aquaculture: an situ microcosm experiment a Chilean fjord Lasse Mork Olsen1,*, Klaudia L. Hernández2, Murat Van Ardelan3, Jose Luis Iriarte4,5, K. Can Bizsel6, Yngvar Olsen7 1Norwegian...
Diatoms are an ecologically successful group within the phytoplankton, and their special feature is a biofabricated silica cell encasement called frustule. These frustules attract interest in material technology, one potential application to use them solar technology. The frustule with its nanoscaled pattern interesting per se, but utility enhanced if we succeed incorporating other elements. Titanium element because oxide semi-conductor high band gap. However, doping relevant elements...
A dual isotope labelling technique was used to follow the distribution of carbon and phosphorus in plankton microcosms containing autotrophs (Tetraselmis sp.), heterotrophic bacteria herbivores (Brachionus plicatilis) at eight different total-P concentrations. P:C ratios algae, dissolved matter, as well general accumulation degradable organic carbon, indicated that both were P-limited all microcosms. According theory, such coexistence should only be possible if have higher predation losses...
AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 6:11-27 (2014) - DOI: https://doi.org/10.3354/aei00114 Responses in microbial food web increased rates of nutrient supply a southern Chilean fjord: possible implications cage aquaculture Lasse Mork Olsen1,*, Klaudia L. Hernández2,3, Murat Van Ardelan4, Jose Luis Iriarte5, Nicolas Sánchez4, Humberto E....
High-altitude wetland holds freshwater springs, evaporitic ponds and lagoon with variable salinity nutrients, potentially influencing the ecology of nitrifying communities. In this study, microorganisms in Salar de Huasco (Chile) were surveyed to determine bacterial archaeal contribution ammonium (AO), nitrite oxidation (NO), uptake (AU) during wet dry seasons. The activity signals from these groups assessed by specific amoA-qPCR transcription, 15N tracer studies addition group inhibitor...
Abstract In the Arctic Ocean ice algae constitute a key ecosystem component and algal spring bloom critical event in annual production cycle. The bulk of biomass is usually found bottom few cm sea dominated by pennate diatoms attached to matrix. Here we report red tide phototrophic ciliate Mesodinium rubrum located at ice-water interface newly formed pack high early spring. These planktonic ciliates are not able attach ice. Based on observations theory fluid dynamics, propose that convection...