Browsing NTNU Open by Author "Jensen, Henrik"
Now showing items 81-100 of 103
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Sex-linked inheritance, genetic correlations and sexual dimorphism in three melanin-based colour traits in the barn owl
Roulin, Alexandre; Jensen, Henrik (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 ... -
Signatures of genetic adaptation to extremely varied Australian environments in introduced European house sparrows
Andrew, Samuel C.; Jensen, Henrik; Hagen, Ingerid Julie; Lundregan, Sarah; Griffith, Simon C. (Journal article; Peer reviewed, 2018)Due to its history of multiple introductions to novel environments worldwide, the house sparrow has been used as a model species to study local adaption in invasive avian species. New genomic resources such as a custom ... -
Signs of adaptation to trace metal contamination in a common urban bird
Andrew, Samuel C.; Taylor, Mark Patrick; Lundregan, Sarah; Lien, Sigbjørn; Jensen, Henrik; Griffith, Simon C. (Journal article; Peer reviewed, 2018)Metals and metalloids at elevated concentrations can be toxic to both humans and wildlife. In particular, lead exposure can act as a stressor to wildlife and cause negative effects on fitness. Any ability to adapt to stress ... -
Spatial and temporal variation in hippoboscid parasitism by Ornithomya chloropus on house sparrows (Passer domesticus) and its effect on survival
Vastveit, Helene Russell (Master thesis, 2013)1. I examined how the Hippoboscidae Ornithomya chloropus is spatially and temporally distributed in an insular metapopulation of house sparrows in northern Norway from 2004-2011, whether there were demographic differences ... -
Spatial structure and dispersal dynamics in a house sparrow metapopulation
Ranke, Peter Sjolte; Araya-Ajoy, Yimen; Ringsby, Thor Harald; Pärn, Henrik; Rønning, Bernt; Jensen, Henrik; Wright, Jonathan; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)The effects of spatial structure on metapopulation dynamics depend upon the interaction between local population dynamics and dispersal, and how this relationship is affected by the geographical isolation and spatial ... -
Spatial variation in senescence rates in a bird metapopulation
Holand, Håkon; Kvalnes, Thomas; Gamelon, Marlène; Tufto, Jarle; Jensen, Henrik; Pärn, Henrik; Ringsby, Thor Harald; Sæther, Bernt-Erik (Journal article, 2016)Investigating factors which affect the decline in survival with age, i.e. actuarial senescence, is important in order to understand how demographic rates vary in wild populations. Although the evidence for the occurrence ... -
Spatial variation in the evolutionary potential and constraints of basal metabolic rate and body mass in a wild bird
Nafstad, Ådne Messel; Rønning, Bernt; Aase, Kenneth; Ringsby, Thor Harald; Hagen, Ingerid Julie; Ranke, Peter Sjolte; Kvalnes, Thomas; Stawski, Clare; Räsänen, Katja; Sæther, Bernt-Erik; Muff, Stefanie; Jensen, Henrik (Peer reviewed; Journal article, 2023)An organism's energy budget is strongly related to resource consumption, performance, and fitness. Hence, understanding the evolution of key energetic traits, such as basal metabolic rate (BMR), in natural populations is ... -
Spatio-temporal dispersal dynamics of a natural house sparrow metapopulation
Saatoglu, Dilan (Doctoral theses at NTNU;2023:341, Doctoral thesis, 2023)Dispersal plays a critical role in determining eco-evolutionary dynamics by affecting population sizes and causing gene flow, which influence spatial correlations in demography and genetic structure of local populations. ... -
Spatio-temporal variation in phenotypic selection in a metapopulation of house sparrows (Passer domesticus)
Attila, Samu (Master thesis, 2020)Romlig-tidsmessig variasjon i naturlig seleksjon kan ha viktige evolusjonære konsekvenser og innsamling av kunnskap om slik variasjon kan vise seg å være nyttig i bevaringsbiologi. Mange studier har målt romlig eller ... -
Spatiotemporal variation in laying date and its impact on reproductive success in house sparrows (Passer domesticus)
Johansen, Sonja Kristina Norum (Master thesis, 2018)Timing of breeding is an important determinant of reproductive success for animals living in seasonal environments. Understanding the factors affecting reproductive processes are necessary to predict how populations may ... -
Steroids in house sparrows (Passer domesticus): Effects of POPs and male quality signalling
Nossen, Ida; Ciesielski, Tomasz Maciej; Dimmen, Malene Vågen; Jensen, Henrik; Ringsby, Thor Harald; Polder, Anuschka; Rønning, Bernt; Jenssen, Bjørn Munro; Styrishave, Bjarne (Journal article, 2016)At high trophic levels, environmental contaminants have been found to affect endocrinological processes. Less attention has been paid to species at lower trophic levels. The house sparrow (Passer domesticus) may be a useful ... -
Survival Analysis using Integrated Nested Laplace Approximations: A Case Study of House Sparrows from Aldra
Nilssen, Yngvar (Master thesis, 2011)The animal model is a generalized linear mixed model (GLMM) often used in evolutionary biology and animal breeding. Integrated Nested Laplace Approximation (INLA) is a quite new methodology for making fast non-sampling ... -
Temporal and spatial variation in prevalence of the parasite Syngamus trachea in a metapopulation of House Sparrows (Passer domesticus)
Holand, Håkon; Jensen, Henrik; Tufto, Jarle; Sæther, Bernt-Erik; Ringsby, Thor Harald (Journal article, 2013)When investigating parasite–host dynamics in wild populations, a fundamental parameter to investigate is prevalence. This quantifies the percentage of individuals infected in the population. Investigating how prevalence ... -
The easy road to genome-wide medium density SNP screening in a non-model species: development and application of a 10K SNP-chip for the house sparrow (Passer domesticus)
Hagen, Ingerid Julie; Billing, Anna Maria; Rønning, Bernt; Pedersen, Sindre Andre; Pärn, Henrik; Slate, Jon; Jensen, Henrik (Journal article, 2013)With the advent of next generation sequencing, new avenues have opened to study genomics in wild populations of non-model species. Here, we describe a successful approach to a genome-wide medium density Single Nucleotide ... -
The effect of haemoglobin concentration on the thermal conductance and metabolic rate of house sparrows
Nybø, Karina (Master thesis, 2023)Endoterme dyr (pattedyr og fuglar) brukar metabolsk energi for å halde kroppstemperaturen sin på eit stabilt nivå. Den termoregulatoriske kurva, først beskrive av Scholander og Irving, viser korleis den metabolske raten ... -
The effects of inbreeding on resting metabolic rate and thermal conductance in wild house sparrows (Passer domesticus)
Knudsen, Sofie (Master thesis, 2022)Menneskelige påvirkninger fører til at populasjoner blir mindre, mer fragmenterte og isolerte, som kan resultere i populasjonsstørrelser som er mer sårbare for innavl. Når innavl reduserer trekk som er nært knyttet til ... -
The genetic basis of variation in clutch size and onset of laying in a wild population of House Sparrows (Passer domesticus)
Bjerck, Helge Bostwick (Master thesis, 2016)Understanding the basis of genetic variation is a general goal in evolutionary biology. Towards this goal, the architectures of the standing genetic variation in two life history traits, clutch size and onset of laying, ... -
The Genetics of Basal Metabolic Rate in free-living Populations of House Sparrows (Passer domesticus)
Tennfjord, Øystein Øy (Master thesis, 2016)Animals must allocate their energy reserves between growth, reproduction and survival. Basal metabolic rate (BMR) is a quantitative trait, which can represent the cost of living , and is a key component in the energy ... -
The genomic mosaicism of hybrid speciation
Elgvin, Tore Oldeide; Trier, Cassandra Nicole; Tørresen, Ole Kristian; Hagen, Ingerid; Lien, Sigbjørn; Nederbragt, Alexander Johan; Ravinet, Mark Simon Paul; Jensen, Henrik; Sætre, Glenn-Peter (Journal article; Peer reviewed, 2017)Hybridization is widespread in nature and, in some instances, can result in the formation of a new hybrid species. We investigate the genetic foundation of this poorly understood process through whole-genome analysis of ... -
The Landscape Genomics of the Scandinavian Red Fox
Arntsen, Lina Gansmoe (Master thesis, 2022)Som følge av globale endringer i miljø og arealbruk har man sett endringer i økosystemer og ekspansjon i boreale arter. Landskapsgenomikk er et spirende fagfelt som kombinerer økologi og genetikk. I sammenheng med globale ...