Browsing NTNU Open by Author "Leiknes, Øystein"
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Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study
Tsagaraki, Tatiana Margo; Pree, Bernadette; Leiknes, Øystein; Larsen, Aud; Bratbak, Gunnar; Øvreås, Lise; Egge, Jorun Karin; Spanek, Roman; Paulsen, Maria Lund; Olsen, Yngvar; Vadstein, Olav; Thingstad, T. Frede (Journal article; Peer reviewed, 2018)Combining a minimum food web model with Arctic microbial community dynamics, we have suggested that top-down control by copepods can affect the food web down to bacterial consumption of organic carbon. Pursuing this ... -
Experiment design and bacterial abundance control extracellular H2O2 concentrations during four series of mesocosm experiments
Hopwood, M. J.; Sanchez, Nicolas; Polyviou, Despo; Leiknes, Øystein; Gallego-Urrea, Julian Alberto; Achterberg, Eric P.; Ardelan, Murat Van; Aristegui, Javier; Bach, Lennart T.; Besiktepe, Sengul; Heriot, Yohann; Kalantzi, Ioanna; Terblylk Kurt, Tuba; Santi, Ioulia; Tsagaraki, Tatiana Margo; Turner, David (Peer reviewed; Journal article, 2020)The extracellular concentration of H2O2 in surface aquatic environments is controlled by a balance between photochemical production and the microbial synthesis of catalase and peroxidase enzymes to remove H2O2 from solution. ... -
Fe(II) stability in coastal seawater during experiments in Patagonia, Svalbard, and Gran Canaria
Hopwood, Mark J.; Santana-González, Carolina; Gallego-Urrea, Julian Alberto; Sanchez, Nicolas; Achterberg, Eric P.; Ardelan, Murat Van; Gledhill, Martha; González-Dávila, Melchor; Hoffmann, Linn; Leiknes, Øystein; Santana-Casiano, Juana Magdalena; Tsagaraki, Tatiana Margo; Turner, David (Peer reviewed; Journal article, 2020)The speciation of dissolved iron (DFe) in the ocean is widely assumed to consist almost exclusively of Fe(III)-ligand complexes. Yet in most aqueous environments a poorly defined fraction of DFe also exists as Fe(II), the ... -
Funksjonell økologi hos pikoplankton - med fokus på bottom-up og top-down effekter
Olsen, Aina Alice (Master thesis, 2017)Et mesokosme- og et mikrokosmeforsøk ble utført over 10 og 11 dager i Patagonia, Chile. To eksperimentelle variabler ble benyttet; tetthet av kopepoder med to nivåer (lav beiting, LB og høy beiting, HB) og tilsetning av ... -
Temporal dynamics of carbon sequestration in coastal North Atlantic fjord system as seen through dissolved organic matter characterisation
Mathew, K Avarachen; Ardelan, Murat Van; Villa Gonzalez, Susana; Vadstein, Olav; Sajith Vezhapparambu, Veena; Leiknes, Øystein; Mankettikkara, Rahman; Olsen, Yngvar (Peer reviewed; Journal article, 2021)Fjord systems in higher latitudes are unique coastal water ecosystems that facilitate the study of dissolved organic matter (DOM) dynamics from surface to deeper waters. The current work was undertaken in the Trondheim ... -
The Effect of Essential Fatty Acids for the Somatic Growth in Nauplii of Calanus finmarchicus
Leiknes, Øystein; Siv Anina, Etter; Nils Egil, Tokle; Maria, Bergvik; Vadstein, Olav; Olsen, Yngvar (Journal article; Peer reviewed, 2016) -
The effect of nutrition on important life-history traits in the marine copepod Calanus finmarchicus
Leiknes, Øystein (Doktoravhandlinger ved NTNU;2016:54, Doctoral thesis, 2016)Summary of thesis: Copepods dominates the zooplankton biomass in all seas of the world and are probably the most numerous multicellular organism on earth. Calanus finmarchicus (Gunnerus 1770) is the dominating ...