Browsing Institutt for biologi by Title
Now showing items 2058-2077 of 2596
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Sensitivity Analysis of Effective Population Size to Demographic Parameters in House Sparrow Populations
(Master thesis, 2015)In population management, the effective population size, Ne, can be viewed in tandem with actual population size, N, as the main factors determining a population s long-term viability and sustainability. Ne is the number ... -
Sensitivity analysis of effective population size to demographic parameters in house sparrow populations
(Journal article, 2017)The ratio between the effective and the census population size, (math formula), is an important measure of the long-term viability and sustainability of a population. Understanding which demographic processes that affect ... -
Seroprevalence for Brucella spp. in Baltic ringed seals (Phoca hispida) and T East Greenland harp (Pagophilus groenlandicus) and hooded (Cystophora cristata) seals
(Journal article; Peer reviewed, 2018)Zoonotic infections transmitted from marine mammals to humans in the Baltic and European Arctic are of unknown significance, despite given considerable potential for transmission due to local hunt. Here we present results ... -
Seroprevalence of avian influenza in Baltic common eiders (Somateria mollissima) and pink-footed geese (Anser brachyrhynchus)
(Peer reviewed; Journal article, 2020)Influenza viruses are negative-sense single-stranded RNA viruses within the family of Orthomyxoviridae (Alexander, 2008). It holds Influenza A, B, C and D. Influenza A, B and C cause disease in humans, while only Influenza ... -
Servicescape of the Greater Serengeti-Mara Ecosystem: Visualizing the linkages between land use, biodiversity and the delivery of wildlife-related ecosystem services
(Journal article; Peer reviewed, 2019)Understanding how anthropogenic activities and management actions influence the delivery of ecosystem services is complicated by the interrelated nature of diverse factors. We present a Bayesian Belief Network to highlight ... -
Sex Allocation in Relation to Host Races in the Brood-Parasitic Common Cuckoo (Cuculus canorus)
(Journal article; Peer reviewed, 2012)Sex allocation theory and empirical evidence both suggest that natural selection should favour maternal control of offspring sex ratio in relation to their ability to invest in the offspring. Generalist parasites constitute ... -
Sex in murky waters: algal induced turbidity increases sexual selection in pipefish
(Journal article; Peer reviewed, 2017)Algal-induced turbidity has been shown to alter several important aspects of reproduction and sexual selection. However, while turbidity has been shown to negatively affect reproduction and sexually selected traits in some ... -
Sex roles and reproductive behaviour in gobies and guppies : a female perspective
(Doctoral thesis, 2003)This thesis focuses on reproductive dynamics, behaviour and selection from a female perspective. The aim was to explore variation in sex roles and potential for selection on females, as well as the selective forces working ... -
Sex roles and sexual selection: Lessons from a dynamic model system
(Journal article; Peer reviewed, 2018)Our understanding of sexual selection has greatly improved during the last decades. The focus is no longer solely on males, but also on how female competition and male mate choice shape ornamentation and other sexually ... -
Sex roles in egg recognition and egg polymorphism in avian brood parasitism
(Journal article, 2012)Avian brood parasites impose strong selection on their hosts leading to the evolution of antiparasite defenses like egg recognition and rejection. Discordance and template-based cognitive mechanisms may form the base for ... -
Sex-biased dispersal in a northern ungulate population
(Journal article; Peer reviewed, 2011)In most mammals dispersal is male-biased and in many polygynous ungulates female philopatry and matrilineal grouping involve small-scale genetic structure. We have through sex-related differences in microsatellite allele ... -
Sex-biased dispersal in water voles (Arvicola amphibius) in northern Norway
(Master thesis, 2017)Dispersal is key to the population dynamic in discrete habitats. There is variation in dispersal rate and range both between and within species, based on environmental variation and between both populations and individuals. ... -
Sex-Dependent Phenotypic Association between Immigration and Seasonal Migration in a Partially Migratory Bird
(Master thesis, 2024)Forholdet mellom innvandring og sesongbasert migrasjon — avgjørende for økologiske og evolusjonære dynamikker — forblir et uløst fundamentalt spørsmål i bevegelsesøkologi. En positiv assosiasjon indikerer at høyere ... -
Sex-linked inheritance, genetic correlations and sexual dimorphism in three melanin-based colour traits in the barn owl
(Journal article; Peer reviewed, 2015)Theory states that genes on the sex chromosomes have stronger effects on sexual dimorphism than genes on the autosomes. Although empirical data are not necessarily consistent with this theory, this situation may prevail ... -
Sex-specific space use patterns in wild alpine reindeer: potential consequences for disease transmission
(Master thesis, 2021)Dyrs bevegelsesmønstre påvirker mange økologiske prosesser, som til syvende og sist påvirker individets fitness. I tillegg til den romlige skalaen av individets bevegelser, for eksempel målt i størrelsen på sesongmessige ... -
Shallow-Water Habitat Mapping using Underwater Hyperspectral Imaging from an Unmanned Surface Vehicle: A Pilot Study
(Journal article; Peer reviewed, 2019)The impacts of human activity on coastal ecosystems are becoming increasingly evident across the world. Consequently, there is a growing need to map, monitor, and manage these regions in a sustainable manner. In this pilot ... -
Shallow-Water Scavengers of Polar Night and Day – An Arctic Time-Lapse Photography Study
(Journal article; Peer reviewed, 2021)Until recently, polar night constituted truly a “mare incognitum” of our times. Yet, the first records from this very little-explored period showcased a surprisingly rich and active ecosystem. This investigation aims to ... -
Shedding Light on Bidstrup's Changing Plant Community: the connection between understorey vegetation, light and former land-use from 1998 to 2022
(Master thesis, 2023)Moderne skoger er ofte plassert på områder som er sterkt påvirket av menneskelig inngrep, og de fleste europeiske skoger har tidligere vært brukt som jordbruksområder eller slettelandskap som beitemark. I Danmark er de ... -
Shift work in the offshore vessel fleet: circadian rhythms and cognitive performance.
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:39, Doctoral thesis, 2012)Workers on offshore vessels operate day and night under a wide variety of environmental conditions. Shift-work affects human physiology and it is known to cause fatigue and other health-related issues. Shift work is common ... -
Short-term effects of data loggers on behaviour and physiology of two species of seabirds: the black-legged kittiwake Rissa tridactyla and the common guillemot Uria aalge
(Master thesis, 2013)New technology, such as loggers and transmitters, has the last three decades become an important part of the research on free-living animals. Loggers are very useful in seabird studies. Seabirds often travel considerable ...