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
- (2020) Initial short-term nitrate uptake in juvenile, cultivated Saccharina latissima (Phaeophyceae) of variable nutritional state. Aquatic Botany. vol. 168.
- (2020) Latitudinal, seasonal and depth-dependent variation in growth, chemical composition and biofouling of cultivated Saccharina latissima (Phaeophyceae) along the Norwegian coast. Journal of Applied Phycology. vol. 32.
- (2020) Phenylalanine Hydroxylase RNAi Knockdown Negatively Affects Larval Development, Molting and Swimming Performance of Salmon Lice. Frontiers in Marine Science. vol. 7 (608463).
- (2020) The Effect of Nutrient Availability and Light Conditions on the Growth and Intracellular Nitrogen Components of Land-Based Cultivated Saccharina latissima (Phaeophyta). Frontiers in Marine Science. vol. 7 (557460).
- (2020) Biofouling on salmon pen nets and cleaner fish shelters does not harbor planktonic stages of sea lice. Frontiers in Marine Science. vol. 7 (727).
- (2020) Comparative transcriptomics reveals domestication‐associated features of Atlantic salmon lipid metabolism. Molecular Ecology. vol. 29 (10).
- (2019) Incorporation of feed and fecal waste from salmon aquaculture in great scallops (Pecten Maximus) co-fed by different algal concentrations. Frontiers in Marine Science. vol. 5.
- (2019) Dietary fatty acid source has little effect on the development of the immune system in the pyloric caeca of Atlantic salmon fry. Scientific Reports. vol. 9 (27).
- (2019) Atlantic salmon raised with diets low in long-chain polyunsaturated n-3 fatty acids in freshwater have a Mycoplasma-dominated gut microbiota at sea. Aquaculture Environment Interactions. vol. 11.
- (2019) Effect of hydroxamate and catecholate siderophores on iron availability in the diatom Skeletonema costatum: Implications of siderophore degradation by associated bacteria. Marine Chemistry. vol. 209.
- (2018) The potential for upscaling kelp (Saccharina latissima) cultivation in salmon-driven integrated multi-trophic aquaculture (IMTA). Frontiers in Marine Science. vol. 9:418.
- (2018) A systemic study of lipid metabolism regulation in salmon fingerlings and early juveniles fed plant oil. British Journal of Nutrition. vol. 120 (6).
- (2018) Transcriptional development of phospholipid and lipoprotein metabolism in different intestinal regions of Atlantic salmon (Salmo salar) fry. BMC Genomics. vol. 19.
- (2018) Transcriptional regulation of lipid metabolism when salmon fry switches from endogenous to exogenous feeding. Aquaculture. vol. 503.
- (2018) Effect of Siderophore on Iron Availability in a Diatom and a Dinoflagellate Species: Contrasting Response in Associated Bacteria. Frontiers in Marine Science. vol. 5 (118).
- (2018) Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study. The ISME Journal. vol. 12 (11).
- (2018) Managing the microbial community of marine fish larvae: a holistic perspective for larviculture. Frontiers in Microbiology. vol. 9.
- (2018) K-selection as microbial community management strategy: A method for improved viability of larvae in aquaculture. Frontiers in Microbiology. vol. 9.
- (2018) Rearing water treatment induces microbial selection influencing the microbiota and pathogen associated transcripts of Cod (Gadus morhua) Larvae. Frontiers in Microbiology. vol. 9 (MAY).
- (2017) Responses in bacterial community structure to waste nutrients from aquaculture: an in situ microcosm experiment in a Chilean fjord. Aquaculture Environment Interactions. vol. 9.