Browsing Department of Biological Sciences by Title
Now showing items 1567-1586 of 2273
-
Ontogenetic Change in Behavioral Responses to Structural Enrichment From Fry to Parr in Juvenile Atlantic Salmon (Salmo salar L.)
(Journal article; Peer reviewed, 2021)Enrichment is widely used as a tool for studying how changes in environment affect animal behavior. Here, we report an experimental study investigating if behaviors shaped by stimuli from environmental enrichment depending ... -
Ontogenetic movements of cod in Arctic fjords and the Barents Sea as revealed by otolith microchemistry
(Journal article; Peer reviewed, 2020-04-06)The distribution of Atlantic cod (Gadus morhua) in northern Norwegian waters is expanding eastward and northward in the Barents Sea and along western Svalbard. In the Arctic fjords of Svalbard, cod has become abundant, but ... -
Ontogenetic niche shifts in a locally endangered tree species (Olea europaea subsp. cuspidata) in a disturbed forest in Northern Ethiopia: Implications for conservation
(Journal article; Peer reviewed, 2021)Understanding the responses of different ontogenetic stages to environmental and human disturbance factors is essential for developing efficient conservation strategies for endangered plant species. We examined how three ... -
The ontogeny and brain distribution dynamics of the appetite regulators NPY, CART and pOX in larval Atlantic cod (Gadus morhua L.)
(Peer reviewed; Journal article, 2016-04-21)Similar to many marine teleost species, Atlantic cod undergo remarkable physiological changes during the early life stages with concurrent and profound changes in feeding biology and ecology. In contrast to the digestive ... -
An open pilot study of an internet-delivered intervention targeting self-perceived residual cognitive symptoms after major depressive disorder
(Journal article; Peer reviewed, 2021)Residual cognitive symptoms are associated with reduced daily life functioning, quality of life and represent a risk factor for relapse of major depressive disorder (MDD). There are few studies targeting self-perceived ... -
Open water zooplankton communities in North African wetland lakes: the CASSARINA Project
(Peer reviewed; Journal article, 2001)Zooplankton (Copepoda, Cladocera, Ostracoda, Rotifera and Diptera larvae) in nine North African lakes was collected from open water areas over twenty months during 1997/99. The results were used to monitor changes in the ... -
Open-source data reveal how collections-based fungal diversity is sensitive to global change
(Peer reviewed; Journal article, 2019)Premise of the Study Fungal diversity (richness) trends at large scales are in urgent need of investigation, especially through novel situations that combine long‐term observational with environmental and remotely sensed ... -
Operational analysis for COVID-19 testing: Determining the risk from asymptomatic infections
(Journal article; Peer reviewed, 2023)Testing remains a key tool for managing health care and making health policy during the coronavirus pandemic, and it will probably be important in future pandemics. Because of false negative and false positive tests, the ... -
Operculum PIT tagging: a viable alternative to avoid human consumption in processed salmon
(Journal article; Peer reviewed, 2021)Background: Passive integrated transponder (PIT) tags are commonly used to identify individual fish. However, use of PIT tags in commercial aquaculture research is limited by consumer safety concerns. For farmed fish, it ... -
Opposite selection on behavioural types by active and passive fishing gears in a simulated guppy Poecilia reticulata fishery
(Peer reviewed; Journal article, 2015-03)This study assessed whether fishing gear was selective on behavioural traits, such as boldness and activity, and how this was related with a productivity trait, growth. Female guppies Poecilia reticulata were screened for ... -
Optimal defense strategies in an idealized microbial food web under trade-off between competition and defense
(Peer reviewed; Journal article, 2014-07-07)Trophic mechanisms that can generate biodiversity in food webs include bottom-up (growth rate regulating) and top-down (biomass regulating) factors. The top-down control has traditionally been analyzed using the concepts ... -
Optimal reproductive phenology under size-dependent cannibalism
(Journal article; Peer reviewed, 2020)Intra-cohort cannibalism is an example of a size-mediated priority effect. If early life stages cannibalize slightly smaller individuals, then parents face a trade-off between breeding at the best time for larval growth ... -
Optimal response to lousy circumstances: The impact of salmon lice (Lepeophtheirus salmonis) on depth preference of sea trout (Salmo trutta)
(Master thesis, 2018-06-12)Sea trout are known for seeking out sources of freshwater to rid themselves of salmon lice. Still, the effect of natural haloclines in fjords on parasite dynamics is not well understood. We tagged 48 wild caught sea trout, ... -
Optimalisering av vektordesign for en mukosal DNA-vaksine mot lakselus (Lepeophtheirus salmonis) i laks (Salmo salar)
(Master thesis, 2023-06-02)Den marine hoppekrepsen Lepeophtheirus salmonis (lakselus) er en blodspisende ektoparasitt som infiserer vill laksefisk, deriblant oppdrettslaks. Lakselusen utgjør det viktigste problemet i oppdrettsnæringen, da skadene ... -
Optimisation of dietary n-3 and n-6 fatty acids for a robust Atlantic salmon (Salmo salar)
(Doctoral thesis, 2022-06-28)An optimal diet for Atlantic salmon (Salmo salar) should promote a healthy fish that is robust to changes in its environmental conditions and can withstand the handling it will encounter under farming conditions, all while ... -
Optimisation of trace mineral supplementation in diets for Atlantic salmon smolt with reference to holistic fish performance in terms of growth, health, welfare, and potential environmental impacts
(Journal article; Peer reviewed, 2023)The aquafeed ingredient inventory is ever changing, from marine to plant based, and recently evolving to incorporate increasing amounts of low trophic, side stream and circular economy based raw materials, each one ... -
Optimization of high-throughput lipid screening of the microalga Nannochloropsis oceanica using BODIPY 505/515
(Journal article; Peer reviewed, 2021-03)Background Microalgae are considered a promising platform for sustainable lipid production. Despite this, productivities need to be improved to facilitate an economically viable production process. This can be achieved ... -
Optimization of Low-Biomass Sample Collection and Quantitative PCR-Based Titration Impact 16S rRNA Microbiome Resolution
(Journal article; Peer reviewed, 2022)The major aquatic interface between host and environment in teleost finfish species is the gill. The diversity of this infraclass, high complexity of the organ, and its direct exposure to the surrounding environment make ... -
Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea
(Peer reviewed; Journal article, 2011-01-12)To evaluate the role of bacteria in the transformation of organic matter in subarctic waters, we investigated the effect of mineral nutrients (ammonia and phosphate) and organic carbon (glucose) enrichment on heterotrophic ...