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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.
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crossref(2024)
AQUACULTURE (2024): 740131-740131
Shuang‐lin Dong,Yun‐wei Dong,Ling Cao,Johan Verreth,Yngvar Olsen, Wen‐jing Liu, Qi‐zhi Fang,Yan‐gen Zhou,Li Li, Jing‐yu Li, Yong‐tong Mu, Patrick Sorgeloos
Reviews in Aquacultureno. 3 (2022)
Kasper Hancke,Ole Jacob Broch,Yngvar Ôlsen,Trine Bekkby, Pia Kupka Hansen, Reinhold Fieler,Karl M. Attard,Gunhild Borgersen,Hartvig Christie
36 (2021)
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Advances in Biological Sciences ResearchJoint proceedings of the 2nd and the 3rd International Conference on Food Security Innovation (ICFSI 2018-2019) (2021)
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