Browsing Publikasjoner fra CRIStin - NTNU by Author "Vadstein, Olav"
Now showing items 1-20 of 61
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Anaerobic digestion of pig manure supernatant at high ammonia concentrations characterized by high abundances of Methanosaeta and non-euryarchaeotal archaea
Nordgård, Anna Synnøve Røstad; Bergland, Wenche Hennie; Vadstein, Olav; Mironov, Vladimir; Bakke, Rune; Østgaard, Kjetill; Bakke, Ingrid (Journal article; Peer reviewed, 2017)We examined the effect of ammonium and temperature on methane production in high rate upflow anaerobic sludge bed reactors treating pig manure supernatant. We operated four reactors at two ammonium concentrations (‘low’ ... -
Aquaculture rearing systems induce no legacy effects in Atlantic cod larvae or their rearing water bacterial communities
Gundersen, Madeleine S.; Vadstein, Olav; De Schryver, Peter; Attramadal, Kari (Peer reviewed; Journal article, 2022)The microbial rearing quality influences the survival of marine larvae. Microbially matured water treatment systems (MMS) provide a more favourable rearing water microbiome than flow-through systems (FTS). It has previously ... -
Bacterial community assembly in Atlantic cod larvae (Gadus morhua): Contributions of ecological processes and metacommunity structure
Vestrum, Ragnhild Inderberg; Attramadal, Kari; Vadstein, Olav; Gundersen, Madeleine Stenshorne; Bakke, Ingrid (Peer reviewed; Journal article, 2020)Many studies demonstrate the importance of the commensal microbiomes to animal health and development. However, the initial community assembly process is poorly understood. It is unclear to what extent the hosts select for ... -
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 ... -
Biofilms remember: Osmotic stress priming as a microbial management strategy for improving salinity acclimation in nitrifying biofilms
Navada, Sharada; Vadstein, Olav; Gaumet, Frederic; Tveten, Ann-Kristin; Spanu, Claudia; Mikkelsen, Øyvind; Kolarevic, Jelena (Peer reviewed; Journal article, 2020)With increasing freshwater scarcity and greater use of seawater,fluctuating salinities are becomingcommon in water treatment systems. This can be challenging for salinity-sensitive processes like nitri-fication, especially ... -
Changes in microbial water quality in RAS following altered feed loading
Rojas-Tirado, Paula; Pedersen, Per Bovbjerg; Vadstein, Olav; Pedersen, Lars-Flemming (Journal article; Peer reviewed, 2018)Intensive recirculating aquaculture systems (RAS) with its hyper-eutrophic water offer ideal conditions for bacterial growth, abundance and activity, potentially affecting fish and system performance. Feed composition and ... -
Changes in the microbial community of an anammox consortium during adaptation to marine conditions revealed by 454 pyrosequencing
Gonzalez Silva, Blanca Magdalena; Rønning, Are J.; Andreassen, Ingrid Krogrud; Bakke, Ingrid; Cervantes, Francisco J.; Østgaard, Kjetill; Vadstein, Olav (Journal article; Peer reviewed, 2017)The anammox activity of a freshwater anammox consortium was strongly inhibited at low-salinity level. Stepwise adaptation from 0 to 3 g NaCl L−1 took 153 days. Further adaptation to high-salinity concentration (from 3 to ... -
Commensal and opportunistic bacteria present in the microbiota in atlantic cod (Gadus morhua) larvae differentially alter the hosts’ innate immune responses
Vestrum, Ragnhild Inderberg; Forberg, Torunn; Luef, Birgit; Bakke, Ingrid; Winge, Per; Olsen, Yngvar; Vadstein, Olav (Journal article; Peer reviewed, 2022)The roles of host-associated bacteria have gained attention lately, and we now recognise that the microbiota is essential in processes such as digestion, development of the immune system and gut function. In this study, ... -
Comparative transcriptomics reveals domestication‐associated features of Atlantic salmon lipid metabolism
Jin, Yang; Olsen, Rolf Erik; Harvey, Thomas Nelson; Østensen, Mari-Ann; Li, Keshuai; Santi, Nina; Vadstein, Olav; Bones, Atle M.; Vik, Jon Olav; Sandve, Simen Rød; Olsen, Yngvar (Peer reviewed; Journal article, 2020)Domestication of animals imposes strong targeted selection for desired traits but can also result in unintended selection due to new domestic environments. Atlantic salmon was domesticated in the 1970s and has subsequently ... -
A comparison of two seawater adaptation strategies for Atlantic salmon post-smolt (Salmo salar) grown in recirculating aquaculture systems (RAS): Nitrification, water and gut microbiota, and performance of fish
Fossmark, Ragnhild Olsen; Attramadal, Kari; Kristian, Nordøy; Østerhus, Stein Wold; Vadstein, Olav (Peer reviewed; Journal article, 2021)The land-based production phase in Norwegian Atlantic salmon farming has the past years been extended to include post-smolt for an increasing number of farmers. Post-smolt production can involve introduction of brackish/seawater ... -
Correlation between microbiota and growth in Mangrove Killifish (Kryptolebias marmoratus) and Atlantic cod (Gadus morhua)
Forberg, Torunn; Sjulstad, Eli Bjørnø; Bakke, Ingrid; Olsen, Yngvar; Hagiwara, Atsushi; Sakakura, Yoshitaka; Vadstein, Olav (Journal article; Peer reviewed, 2016)The vertebrate gut is host to large communities of bacteria, and one of the beneficial contributions of this commensal gut microbiota is the increased nutritional gain from feed components that the host cannot degrade on ... -
Correlations of age and growth rate with microbiota composition in Atlantic cod (Gadus morhua) larvae
Trinh, Ly T. T.; Bakke, Ingrid; Vadstein, Olav (Journal article; Peer reviewed, 2017)Little information is available on the link between host development (growth rate and ontogeny) and the composition of the microbiota in fish larvae. This study was carried out to examine potential correlations of microbiota ... -
Dietary fatty acid source has little effect on the development of the immune system in the pyloric caeca of Atlantic salmon fry
Jalili, Mahsa; Jin, Yang; Bones, Atle M.; Olsen, Yngvar; Vadstein, Olav; Østensen, Mari-Ann; Buonocore, Francesco; Gerdol, Marco; Pallavicini, Alberto; Scapigliati, Giuseppe (Journal article; Peer reviewed, 2019)The quality and relative amounts of dietary lipids may affect the health and growth of cultured Atlantic salmon. So far, little is known about their effects on the performance of the fish immune system during early life ... -
Dietary Lipid Effects on Gut Microbiota of First Feeding Atlantic Salmon (Salmo salar L.)
Eleni, Nikouli; Konstantinos Ar., Kormas; Yang, Jin; Olsen, Yngvar; Bakke, Ingrid; Vadstein, Olav (Peer reviewed; Journal article, 2021)Decline in fish oil and fish meal availability has forced the aquaculture sector to investigate alternative and sustainable aquafeed ingredients. Despite that several studies have evaluated the effect of fish oil replacement ... -
Draft genome sequence of the docosahexaenoic acid producing thraustochytrid Aurantiochytrium sp. T66
Liu, Bin; Ertesvåg, Helga; Aasen, Inga Marie; Vadstein, Olav; Brautaset, Trygve; Heggeset, Tonje Marita Bjerkan (Journal article; Peer reviewed, 2016)Thraustochytrids are unicellular, marine protists, and there is a growing industrial interest in these organisms, particularly because some species, including strains belonging to the genus Aurantiochytrium, accumulate ... -
Dynamic responses to silicon in Thalassiosira pseudonana - Identification, characterisation and classification of signature genes and their corresponding protein motifs
Brembu, Tore; Chauton, Matilde Skogen; Winge, Per; Bones, Atle M.; Vadstein, Olav (Journal article; Peer reviewed, 2017)The diatom cell wall, or frustule, is a highly complex, three-dimensional structure consisting of nanopatterned silica as well as proteins and other organic components. While some key components have been identified, ... -
Effect of hydroxamate and catecholate siderophores on iron availability in the diatom Skeletonema costatum: Implications of siderophore degradation by associated bacteria
Sanchez, Nicolas; Peterson, Claire Katja; Villa Gonzalez, Susana; Vadstein, Olav; Olsen, Yngvar; Ardelan, Murat Van (Journal article; Peer reviewed, 2019)The bioavailability of iron (Fe) across marine ecosystems, mainly determined by Fe speciation and species-specific requirements of phytoplankton, remains largely unresolved. Siderophores are relevant within the pool of ... -
The effect of periodic disturbances and carrying capacity on the significance of selection and drift in complex bacterial communities
Gundersen, Madeleine S.; Vadstein, Olav; Bakke, Ingrid; Andersen, Tom; Morelan, Ian (Peer reviewed; Journal article, 2021)Understanding how periodical disturbances affect the community assembly processes is vital for predicting temporal dynamics in microbial communities. However, the effect of dilutions as disturbances are poorly understood. ... -
Effect of Siderophore on Iron Availability in a Diatom and a Dinoflagellate Species: Contrasting Response in Associated Bacteria
Sanchez, Nicolas; Brown, Eunice Nana Adjoa; Olsen, Yngvar; Vadstein, Olav; Iriarte, Jose Luis; Gonzalez, Humberto E.; Ardelan, Murat Van (Journal article; Peer reviewed, 2018)Organic ligands play a key role controlling trace metal bioavailability in the world's oceans, yet the species-specific requirements determining whether certain iron forms can be metabolized largely remain unclear. ... -
Effects of reduced organic matter loading through membrane filtration on the microbial community dynamics in recirculating aquaculture systems (RAS) with Atlantic salmon parr (Salmo salar)
Fossmark, Ragnhild Olsen; Vadstein, Olav; Rosten, Trond Waldemar; Bakke, Ingrid; Koseto, Deni; Bugten, Anette Voll; Helberg, Gaute Alexander Nedberg; Nesje, Jenny; Jørgensen, Niels O.G.; Raspati, Gema Sakti; Azrague, Kamal; Østerhus, Stein Wold; Attramadal, Kari (Peer reviewed; Journal article, 2020)A key challenge in recirculating aquaculture systems (RAS) is the accumulation of particulate organic matter, especially the fine and colloidal fraction due to low removal efficiency of today's technology. The supply of ...