Background and activities
Research interests and experience
The research activities of Yngvar Olsen have basically been related to different aspects of nutrition of plankton organisms, the first 10 years in freshwater and later on in marine coastal water. Early work involved studies of uptake and use of mineral nutrient in phytoplankton and food intake and allocation in zooplankton. Later work includes more integrated ecological studies of planktonic food webs with a focus on the important functional plankton groups and their trophic interactions in coastal waters. Experimental studies have been most important, and culture systems include batch cultures and chemostat for single organisms, mesocosms for experimental ecosystems, and lakes/lagoons for full scale ecosystem experiments (see list of publications in http://scholar.google.com/citations?user=Vc6KjlIAAAAJ&hl=no).
The majority of the biological activity in the marine ecosystems (>90%) takes place in microorganisms of the planktonic food web, which includes organisms feeding on at least 4 different trophic levels (level 1-4). This is different in terrestrial ecosystems where carnivores eating other carnivores (trophic level 4) are not that common. The functional and structural characteristics of the planktonic food web are most important for the environmental state of the marine ecosystem, for its productivity and fishing yields, and for its ability to take up and sequester carbon through the so called “Biological Carbon Pump” (see Figure). Plankton nutrition and interactions between organisms and functional groups are instrumental for a fully understanding all these aspects.
Fields of research related to plankton nutrition:
- General mechanisms of coastal eutrophication - over-fertilization of coastal water leading to unacceptable environmental state in coastal waters
- Environmental influence of salmon aquaculture on surface water ecosystems, carrying capacity of production
- Planktonic stages of salmon lice, transfer mechanisms in and in between stocks of salmonids
- Lipid nutrition in fish larvae (classified as plankton) and juveniles
- Rotifer culture and their lipid/phospholipids metabolism, lipid enrichment procedures
- Lipid and mineral nutrition of copepods; with focus on red feed Calanus finmarchicus
- Experimental studies of microalgae; growth characteristics and biochemical composition
Fields of research related to aquaculture ecology:
- Integrated multi-trophic aquaculture (IMTA), salmon driven with a focus on waste generation of salmon and macroalgae in IMTA
- Nutrient physiology and growth characteristics of farmed and wild macroalgae
MsC and Phd studies can be advised within all mentioned fields of research.
Specialty Chief Editor: Marine Fisheries, Aquaculture and Living Resources, Frontiers in Marine Science (http://journal.frontiersin.org/journal/marine-science)
Scientific, academic and artistic work
A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database
- (2017) Can inorganic nutrients released from aquaculture fish cages change the seawater bacterial community? A microcosm study from a Chilean fjord. Aquaculture Environment Interactions.
- (2017) Responses in the bacterial community structure to waste nutrients from aquaculture: an in situ microcosm experiment in a Chilean fjord. Aquaculture Environment Interactions. vol. 9 (1).
- (2016) Correlation between microbiota and growth in Mangrove Killifish (Kryptolebias marmoratus) and Atlantic cod (Gadus morhua). Scientific Reports. vol. 6.
- (2016) Effects of different wavelengths and intensities of visible light on the hatching success of Acartia tonsa Dana eggs. Aquaculture International. vol. Published ahead of print.
- (2016) Effects of light and short-term temperature elevation on the 48-h hatching success of cold-stored Acartia tonsa Dana eggs. Aquaculture International. vol. 24 (1).
- (2016) Time kinetics of fatty acid changes in phospholipids following enrichment and starvation of Artemia franciscana with a main focus on docosahexaenoic acid. Aquaculture Nutrition. vol. 22 (1).
- (2016) The effect of essential fatty acids for the somatic growth in nauplii of Calanus finmarchicus. Frontiers in Marine Science. vol. 3:33.
- (2015) Manipulation of the fatty acid composition of phosphatidylcholine and phosphatidylethanolamine in rotifers Brachionus Nevada and Brachionus Cayman. Aquaculture Nutrition. vol. 21 (1).
- (2015) Atlantic cod (Gadus morhua) larvae can biosynthesis phospholipid de novo from 2-oleoyl-glycerol and glycerol precursors. Fish Physiology & Biochemistry. vol. 42 (1).
- (2015) Effect of enrichment time and dietary DHA and non-highly unsaturated fatty acid composition on the efficiency of DHA enrichment in phospholipid of rotifer (Brachionus Cayman). Aquaculture. vol. 446.
- (2015) Gene regulation of lipid and phospholipid metabolism in Atlantic cod (Gadus morhua) larvae. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. vol. 190.
- (2015) How can mariculture better help feed humanity?. Frontiers in Marine Science. vol. 2 (26).
- (2014) RAS and microbial maturation as tools for K-selection of microbial communities improve survival in cod larvae. Aquaculture. vol. 432.
- (2014) Feeding selectivity of Calanus finmarchicus in the Trondheimsfjord. Journal of Sea Research. vol. 85.
- (2014) Inferring time-variable effects of nutrient enrichment on marine ecosystems using inverse modelling and ecological network analysis. Science of the Total Environment. vol. 493.
- (2014) Responses in the microbial food web to increased rates of nutrient supply in a southern Chilean fjord: Possible implications of cage aquaculture. Aquaculture Environment Interactions. vol. 6 (1).
- (2014) DHA content in dietary phospholipids affects DHA content in phospholipids of cod larvae and larval performance. Aquaculture. vol. 428-429.
- (2014) Responses of biological and chemical components in North East Atlantic coastal water to experimental nitrogen and phosphorus addition - A full scale ecosystem study and its relevance for management. Science of the Total Environment. vol. 473-474 (March).
- (2014) Assimilation of inorganic nutrients from salmon (Salmo salar) farming by the macroalgae (Saccharina latissima) in an exposed coastal environment: Implications for integrated multi-trophic aquaculture. Journal of Applied Phycology. vol. 26 (4).
- (2013) Variability of biofouling communities on fish cage nets: A 1-year field study at a Norwegian salmon farm. Aquaculture. vol. 416-417.