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norskFakultet for biovitenskap, fiskeri og økonomi
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Handelshøgskolen ved UiT [757]
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Discontinuity in the molecular neuroendocrine response to increasing daylengths in Ile-de-France ewes: Is transient Dio2 induction a key feature of circannual timing?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-24)In mammals, melatonin is responsible for the synchronisation of seasonal cycles to the solar year. Melatonin is secreted by the pineal gland with a profile reflecting the duration of the night and acts via the pituitary pars tuberalis (PT), which in turn modulates hypothalamic thyroid hormone status via seasonal changes in the production of locally‐acting thyrotrophin. Recently, we demonstrated that, ... -
Marine fish traits follow fast-slow continuum across oceans
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-29)A fundamental challenge in ecology is to understand why species are found where they are and predict where they are likely to occur in the future. Trait-based approaches may provide such understanding, because it is the traits and adaptations of species that determine which environments they can inhabit. It is therefore important to identify key traits that determine species distributions and ... -
Assessing winter pasture quality in Sunnfjord wild reindeer area
(Master thesis; Mastergradsoppgave, 2019-11-30)Winter pastures are bottlenecks for population trends for wild reindeer, and the quality and availability are important parameters when managing populations. Sunnfjord, considered on of the smallest wild reindeer districts in Norway, have never had a comprehensive evaluation of accessible winter pasture within. The aim of study is to assess the quality of winter forage in all tree sub- areas within ... -
Relationship between carbon- and oxygen-based primary productivity in the Arctic Ocean, svalbard archipelago
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-02)Phytoplankton contribute half of the primary production (PP) in the biosphere and are the major source of energy for the Arctic Ocean ecosystem. While PP measurements are therefore fundamental to our understanding of marine biogeochemical cycling, the extent to which current methods provide a definitive estimate of this process remains uncertain given differences in their underlying approaches, and ... -
Effect of Diet Supplemented With Rapeseed Meal or Hydrolysable Tannins on the Growth, Nutrition, and Intestinal Microbiota in Grass Carp (Ctenopharyngodon idellus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-25)Grass carp (<i>Ctenopharyngodon idellus; n</i> = 320) were received four different diets for 56 days. The experimental diets were: fishmeal (FM) containing 10% fishmeal (without rapeseed meal), and rapeseed meal (RM) containing 50% rapeseed meal (without fishmeal), and two semi-purified diets either without (T0) or with 1.25% (T1) supplemental hydrolysable tannin. The approximate content of tannin ... -
Activity patterns in mammals: Circadian dominance challenged
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-15)The evidence that diel patterns of physiology and behaviour in mammals are governed by circadian ‘clocks’ is based almost entirely on studies of nocturnal rodents. The emergent circadian paradigm, however, neglects the roles of energy metabolism and alimentary function (feeding and digestion) as determinants of activity pattern. The temporal control of activity varies widely across taxa, and ungulates, ... -
Seroprevalence of pestivirus in Eurasian tundra reindeer in Finland, Sweden, Norway, Iceland and Russian Federation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-29)Reindeer herding is of great importance for the indigenous people of the Fennoscandia peninsula and northern Russia. There are also free-ranging feral populations of reindeer in Finland, Iceland, Norway and Russian Federation. The genus Pestivirus contains several viral species that infect ungulates and often show capacity to transmit between different host species. Sera from 520 Eurasian tundra ... -
Evidence of seawater drinking in fasting subadult hooded seals (Cystophora cristata)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-29)The purpose of this study was to investigate the total water turnover rate of fasting subadult hooded seals in order to elucidate to what extent these animals rely in seawater drinking/mariposia at this life stage. Considering mariposia is important for later accurate estimations of food consumption using water turnover rate as a proxy. Five subadult hooded seals were kept fasting for 4 days in a ... -
Dypvannsrunddorg – Potensial for effektivt nytt redskap for den norske kystflåten
(Master thesis; Mastergradsoppgave, 2015-02-15)I denne oppgaven vil jeg presentere utviklingsprosessen av og mulighetene for et nytt redskap for kyst- og fjordflåten, dypvannsrunddorg. Dypvannsrunddorgen som redskap er basert på den tradisjonelle runddorgen. Forskjellen er at med en dypvannsrunddorg kan en styre dybden fritt og dermed ha bedre tilgang til fisk som står dypt. Systemet muliggjør også at en kan benytte større bruk sammenlignet med ... -
“All along the curves”: Bridging the gap between comparative statics and simultaneous econometric models
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-31)A simultaneous econometric model of supply and demand provides estimates of own-price effects and the effect of exogenous variables on supply or demand. Most of the time economists use elasticities derived from econometric analysis in a ceteris paribus context, more seldom in a total elasticity setting (Buse in J Farm Econ 40:881–891, 1958). Perhaps even more seldom net effects of exogenous changes ... -
Middle managers' roles after a hospital merger
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-09)<i>Purpose</i> - Mergers are important and challenging elements in hospital reforms. The authors study the social aspects of management and the roles of middle managers in the aftermath of a hospital merger. Especially, the purpose of this paper is to investigate how professional staff and middle managers perceive their relationships with top managers several years after the merger.<p><p> <i> ... -
Sedimentary ancient DNA: Exploring methods of ancient DNA analysis for different taxonomic groups
(Doctoral thesis; Doktorgradsavhandling, 2020-02-28)This thesis explores the potential of sedimentary ancient DNA (sedaDNA) from lakes as a tool for studying past communities. First it sets out to determine what taxa in the environment are most likely to be detected in lake sediments. For this, vegetation surveys were carried out around eleven different lakes in Norway and the taxa detected based on plant metabarcoding of the lake sediments were ... -
Self-presentation via electronic word of mouth - a reflective or impulsive activity?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-12)<i>Purpose</i> - Previous research suggests that self-presentation causes people to have a reflective tendency to produce electronic word-of-mouth (eWOM). Drawing on the theory of the reflective-impulsive model (RIM), this paper aims to examine whether self-presentation also could motivate an impulsive tendency to produce eWOM. Self-monitoring is suggested as a possible moderator in the relationship ... -
Women entrepreneurship in STEM fields: literature review and future research avenues
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-10)The aim of the paper is to explore the published management research on women entrepreneurs in Science, Technology, Engineering and Mathematics (also known as STEM) fields in order to offer a first, comprehensive state-of-the-art of this research. In doing so, a systematic literature review (SLR) of 32 papers has been undertaken. The results of this SLR show that the literature on this topic is still ... -
Sinking Organic Particles in the Ocean—Flux Estimates From in situ Optical Devices
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-18)Optical particle measurements are emerging as an important technique for understanding the ocean carbon cycle, including contributions to estimates of their downward flux, which sequesters carbon dioxide (CO<sub>2</sub>) in the deep sea. Optical instruments can be used from ships or installed on autonomous platforms, delivering much greater spatial and temporal coverage of particles in the mesopelagic ... -
Sjarkfiske og ressursforvaltning
(Doctoral thesis; Doktorgradsavhandling, 1997-11-07)<p>Med utgangspunkt i feltarbeid fra fiskevær i Troms, samt intervjuer med flere fiskere i Troms og Finnmark, drøfter jeg det nordnorske sjarkfisket i lys av to motstridende teorier om ressurshøsting og -regulering. Den ene sier at små enheter er mer ressursvennlige enn store. I småskalaproduksjon finnes innebygde begrensninger i produksjonsmåten, dels fordi vi står ovenfor husholdsbasert produksjon ... -
Optimizing rearing and welfare in Senegalese sole (Solea senegalesensis) broodstock: Effect of ambient light intensity and handling time on stress response
(Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2019-09-25)Broodstock rearing conditions and handling procedures should be optimized in aquaculture species in order to benefit fish welfare and guarantee optimal conditions for spawning. In teleosts, basal cortisol levels display daily rhythms, oscillating along the 24 h of the day. In this sense, handling fish at different moments of the day may lead to different stress responses. The present study aimed at ... -
Facilitation mediates species presence beyond their environmental optimum
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-01)Species distributions are driven by abiotic conditions that filter species with specific traits and physiological tolerances and match them with their suitable environment. Plant–plant interactions can constrict (through competition) or loosen (through facilitation) the strength of these environmental filters, which in turn inhibit or enhance establishment and recruitment of plant species at a finer ... -
Behavior and thermal environment of Chinook salmon Oncorhynchus tshawytscha in the North Pacific Ocean, elucidated from pop-up satellite archival tags
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-22)Chinook salmon are widely distributed in offshore waters of the North Pacific Ocean, and of great economical and subsistence importance; however, little is known about their oceanic ecology. To address this, we tagged 43 Chinook salmon <i>Oncorhynchus tshawytscha</i> (57–100 cm) with pop-up satellite archival tags (PSATs) in the eastern (October– December) and central Bering Sea (August) to provide ... -
East is East and West is West: Population genomics and hierarchical analyses reveal genetic structure and adaptation footprints in the keystone species Paracentrotus lividus (Echinoidea)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-14)<i>Aim</i> - The Atlanto‐Mediterranean edible purple sea urchin, <i>Paracentrotus lividus</i>, is a commercially exploited keystone species in benthic communities. Its browsing activity can deeply modify the littoral landscape, and changes in its abundance are of major conservation concern. This species is facing nowadays contrasting anthropogenic pressures linked to predator release, exploitation ...
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