English
norskBlar i forfatter "Iversen, Marianne"
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Approaches for delaying sexual maturation in salmon and their possible ecological and ethical implications
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-21)The aquaculture industry is under pressure to satisfy global demand for marine foods. Atlantic salmon has been bred for more than 40 years, and substantial progress has been made within the culturing and breeding programs. The improved growth rate of Atlantic salmon has been accompanied by an earlier onset of maturation. Among the factors controlling maturation in salmon are photoperiod, temperature, ... -
Detection of Transgenes in Local Maize Varieties of Small-Scale Farmers in Eastern Cape, South Africa
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-31)Small-scale subsistence farmers in South Africa have been introduced to genetically modified (GM) crops for more than a decade. Little is known about i) the extent of transgene introgression into locally recycled seed, ii) what short and longterm ecological and socioeconomic impacts such mixing of seeds might have, iii) how the farmers perceive GM crops, and iv) to what degree approval conditions ... -
The diet of polar bears (Ursus maritimus)from Svalbard, Norway, inferred from scat analysis
(Master thesis; Mastergradsoppgave, 2011-06-01)The diet of polar bears in the Svalbard area was assessed based analyses of scats (n=119) collected in the Archipelago between 2003 and 2010. Most of the samples were collected in spring. Morphological analysis of the prey remains together with genetic analyses of tissue fragments found in the scats showed that ringed seals (Pusa hispida) were the most important prey group present; this seal species ... -
Diversified regulation of circadian clock gene expression following whole genome duplication
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-08)Across taxa, circadian control of physiology and behavior arises from cell-autonomous oscillations in gene expression, governed by a networks of so-called ‘clock genes’, collectively forming transcription-translation feedback loops. In modern vertebrates, these networks contain multiple copies of clock gene family members, which arose through whole genome duplication (WGD) events during evolutionary ... -
Immunologic Profiling of the Atlantic Salmon Gill by Single Nuclei Transcriptomics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-04)Anadromous salmonids begin life adapted to the freshwater environments of their natal streams before a developmental transition, known as smoltification, transforms them into marine-adapted fish. In the wild, smoltification is a photoperiod-regulated process, involving radical remodeling of gill function to cope with the profound osmotic and immunological challenges of seawater (SW) migration. While ... -
Phenology and cover of plant growth forms predict herbivore habitat selection in a high latitude ecosystem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)The spatial and temporal distribution of forage quality is among the most central factors affecting herbivore habitat selection. Yet, for high latitude areas, forage quantity has been found to be more important than quality. Studies on large ungulate foraging patterns are faced with methodological challenges in both assessing animal movements at the scale of forage distribution, and in assessing ... -
Photoperiod-dependent developmental reprogramming of the transcriptional response to seawater entry in Atlantic salmon (Salmo salar)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-12)The developmental transition of juvenile salmon from a freshwater resident morph (parr) to a seawater (SW) migratory morph (smolt), known as smoltification, entails a reorganization of gill function to cope with the altered water environment. Recently, we used RNAseq to characterize the breadth of transcriptional change which takes place in the gill in the FW phase of smoltification. This highlighted ... -
Photoperiodic history-dependent preadaptation of the smolting gill. Novel players and SW immediate response as markers of growth and welfare
(Doctoral thesis; Doktorgradsavhandling, 2021-04-16)This thesis presents a rich introduction to the evolution, life history and physiology of Atlantic salmon, with a special emphasis on the developmental transitions (termed smolting) juvenile salmon pass through has they prepare to migrate from their native freshwater habitat to the sea. The introduction provides a comprehensive background on chronobiology and osmoregulation in fishes and links this ... -
RNA profiling identifies novel, photoperiodhistory dependent markers associated with enhanced saltwater performance in juvenile Atlantic salmon
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-08)Atlantic salmon migrate to sea following completion of a developmental process known as smolting, which establishes a seawater (SW) tolerant phenotype. Smolting is stimulated by exposure to long photoperiod or continuous light (LL) following a period of exposure to short photoperiod (SP), and this leads to major changes in gill ion exchange and osmoregulatory function. Here, we performed an RNAseq ...
