Browsing NTNU Open by Author "Jensen, Henrik"
Now showing items 21-40 of 82
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Effects of population characteristics and structure on estimates of effective population size in a house sparrow metapopulation
Baalsrud, Helle Tessand; Sæther, Bernt-Erik; Hagen, Ingerid Julie; Myhre, Ane Marlene; Ringsby, Thor Harald; Pärn, Henrik; Jensen, Henrik (Journal article, 2014)Effective population size (Ne) is a key parameter to understand evolutionary processes and the viability of endangered populations as it determines the rate of genetic drift and inbreeding. Low Ne can lead to inbreeding ... -
Effects of Variation in Egg Size on Offspring Fitness in Populations of House Sparrow (Passer domesticus)
Røberg, Anja Ås (Master thesis, 2015)1. Egg size represents an important life-history trait, which may have effects on the fitness of offspring. The effect of variation in egg size on offspring fitness has been studied within many taxa, but there is still a ... -
Endoparasite infection has both short- and long-term negative effects on reproductive success of female house sparrows, as revealed by faecal parasitic egg counts
Holand, Håkon; Jensen, Henrik; Tufto, Jarle; Pärn, Henrik; Sæther, Bernt-Erik; Ringsby, Thor Harald (Journal article; Peer reviewed, 2015)Parasites have the potential to severely reduce host reproductive success. However, the effects of endoparasites on reproductive success have not received the same amount of attention as the effects of parasites on host ... -
Examination of the Adaptive Immune Response to Syngamus trachea in the House Sparrow
Folland, Amanda Marie Arvesen (Master thesis, 2022)Global oppvarming og andre antropologiske faktorer gjør at forhold mellom parasitter og vertsorganismer endrer seg. For å forstå årsakene til og for å være forberedt på konsekvensene av dette er det essensielt å studere ... -
Factors Affecting Juvenile Movement in a House Sparrow Metapopulation
Myhre, Ane Marlene (Master thesis, 2012)Dispersal propensity can vary considerably between individuals in a population. Understanding which individuals disperse- and under what circumstances these individuals disperse is valuable for conservation. Factors ... -
Fitness Consequences of Intra-Island dispersal in a House Sparrow (Passer domesticus) Population
Hansen, Ann-Katrine Esp (Master thesis, 2012)Dispersing individuals have the ability to link fragmented populations to each other, and influence a wide range of ecological and evolutionary processes. Understanding the fitness differences between resident and dispersing ... -
Fur colour in the arctic fox – Genetic architecture and consequences for fitness
Tietgen, Lukas (Master thesis, 2020)‘Genome-wide association studies’ (GWAS) er nyttige verktøy, men er likevel ikke veldig mye brukt til å studere ville populasjoner. Tidligere studier har ofte ikke klart å identifisere gener som ligger til grunn for adaptive ... -
Fur colour in the Arctic fox: genetic architecture and consequences for fitness
Tietgen, Lukas; Hagen, Ingerid Julie; Kleven, Oddmund; Di Bernardi, Cecilia; Kvalnes, Thomas; Norén, Karin; Hasselgren, Malin; Wallen, Johan Fredrik; Angerbjörn, Anders; Landa, Arild; Eide, Nina Elisabeth; Flagstad, Øystein; Jensen, Henrik (Journal article; Peer reviewed, 2021)Genome-wide association studies provide good opportunities for studying the genetic basis of adaptive traits in wild populations. Yet, previous studies often failed to identify major effect genes. In this study, we used ... -
Genetic and Phytochemical diversity in Bilberry (Vaccinium myrtillus) from a limited Geographical Area
Ytterdal, Irene Beatrice (Master thesis, 2011)In Norway today no commercial exploitation of the wild growing Norwegian bilberry (Vaccinium myrtillus) exists. The market in other regions of Europe, North- and South-America is based on the utilization of cultivated ... -
Genetic architecture and heritability of early-life telomere length in a wild passerine
Pepke, Michael Le; Kvalnes, Thomas; Lundregan, Sarah; Boner, Winnie; Monaghan, Pat; Sæther, Bernt-Erik; Jensen, Henrik; Ringsby, Thor Harald (Peer reviewed; Journal article, 2021)Early-life telomere length (TL) is associated with fitness in a range of organisms. Little is known about the genetic basis of variation in TL in wild animal populations, but to understand the evolutionary and ecological ... -
Genetic assignment of individuals to source populations using network estimation tools
Kuismin, Markku; Saatoglu, Dilan; Niskanen, Alina Katariina; Jensen, Henrik; Sillanpää, Mikko J. (Peer reviewed; Journal article, 2019)Dispersal, the movement of individuals between populations, is crucial in many ecological and genetic processes. However, direct identification of dispersing individuals is difficult or impossible in natural populations. ... -
Genetic Basis of Variation in Bill Morphology in a Free-Living House Sparrow Metapopulation
Lundregan, Sarah (Master thesis, 2017)Bill morphology is an ecologically important trait, which shows substantial phenotypic variation, is highly heritable and is under selection in many bird species. These characteristics underscore the suitability of bill ... -
Genetic Basis of Variation in Litter Size in Scandinavian Arctic Fox (Vulpes lagopus)
Rud-Johansen, Live (Master thesis, 2018)The environment is in constant change, where rapid shifts is often due to human interference. To understand the mechanisms driving phenotypic change in ecologically important traits, knowledge of the genetic basis of these ... -
Genetic consequences of conservation action: Restoring the arctic fox (Vulpes lagopus) population in Scandinavia
Hemphill, Elisa June Keeling; Flagstad, Øystein; Jensen, Henrik; Norén, Karin; Wallén, Johan Fredrik; Landa, Arild Magne; Angerbjörn, Anders; Eide, Nina Elisabeth (Peer reviewed; Journal article, 2020)The Arctic fox (Vulpes lagopus) population in Fennoscandia experienced a drastic bottleneck in the late 19th century as a result of high hunting pressure. In the 1990s, despite nearly 70 years of protection, the population ... -
Genetic consequences of conservation management: the case of the arctic fox (Vulpes lagopus) in Scandinavia
Hemphill, Elisa June Keeling (Master thesis, 2017)The Arctic fox (Vulpes lagopus) population in Fennoscandia experienced a drastic demographic and genetic bottleneck in the early 20th century as a result of high hunting pressure. In 2000, despite almost 70 years of ... -
Genetic rescue of an endangered domestic animal through outcrossing with closely related breeds: A case study of the Norwegian Lundehund
Stronen, Astrid Vik; Salmela, Elina; Baldursdottir, Birna K.; Berg, Peer; Espelien, Ingvild S.; Jarvi, Kirsi; Jensen, Henrik; Kristensen, Torsten N.; Melis, Claudia; Manenti, Tommaso; Lohi, Hannes; Pertoldi, Cino (Journal article; Peer reviewed, 2017)Genetic rescue, outcrossing with individuals from a related population, is used to augment genetic diversity in populations threatened by severe inbreeding and extinction. The endangered Norwegian Lundehund dog underwent ... -
Genetic variability and structure of the water vole Arvicola amphibius across four metapopulations in northern Norway
Melis, Claudia; Borg, Åsa Alexandra; Jensen, Henrik; Bjørkvoll, Eirin Marie; Ringsby, Thor Harald; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2013)Water vole Arvicola amphibius populations have recently experienced severe decline in several European countries as a consequence of both reduction in suitable habitat and the establishment of the alien predator American ... -
Genetic variation and structure of house sparrow populations: is there an island effect?
Jensen, Henrik; Moe, Rune; Hagen, Ingerid Julie; Holand, Anna Marie; Kekkonen, Jaana; Tufto, Jarle; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2013)Population genetic structure and intrapopulation levels of genetic variation have important implications for population dynamics and evolutionary processes. Habitat fragmentation is one of the major threats to biodiversity. ... -
A genome-wide linkage map for the house sparrow (Passer domesticus) provides insights into the evolutionary history of the avian genome
Hagen, Ingerid Julie; Lien, Sigbjørn; Billing, Anna Maria; Elgvin, Tore Oldeide; Trier, Cassandra Nicole; Niskanen, Alina K.; Tarka, Maja; Slate, Jon; Sætre, Glenn-Peter; Jensen, Henrik (Peer reviewed; Journal article, 2020)The house sparrow is an important model species for studying physiological, ecological and evolutionary processes in wild populations. Here, we present a medium density, genome wide linkage map for house sparrow (Passer ... -
Genomic consequences of anthropogenic reintroduction in high-arctic Svalbard reindeer
Burnett, Hamish (Master thesis, 2020)Anthropogenic reintroductions are a commonly used conservation strategy following local extirpations. However, establishing new populations with a small number of founders can result in population bottlenecks causing reduced ...