Blar i NTNU Open på forfatter "Jensen, Henrik"
-
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 ... -
Genomic estimation of quantitative genetic parameters in wild admixed populations
Aase, Kenneth; Jensen, Henrik; Muff, Stefanie (Peer reviewed; Journal article, 2022)1. Heritable genetic variation among free-living animals or plants is essential for populations to respond to selection and adapt. It is therefore important to be able to estimate additive genetic variance VA, which can ... -
Highways associated with expansion of boreal scavengers into the alpine tundra of Fennoscandia
Rød-Eriksen, Lars; Skrutvold, Johanna; Herfindal, Ivar; Jensen, Henrik; Eide, Nina Elisabeth (Peer reviewed; Journal article, 2020)1. Habitat fragmentation may affect species distributions through, for example, altered resource availability and shifts in species interactions. Fragmentation by roads has had negative impacts on Fennoscandian alpine ... -
Impact of genetics and epigenetic processes on parasite infection dynamics in the house sparrow
Lundregan, Sarah Louise (Doctoral theses at NTNU;2022:399, Doctoral thesis, 2022)Parasites are important drivers of ecological and evolutionary processes in natural populations, and can exert strong selective pressures on their hosts by reducing host fitness. Investigating the mechanisms involved in ... -
Inbreeding and inbreeding depression in water voles (Arvicola amphibious) in Northern Norway
Gabrielsen, Ida (Master thesis, 2020)Å forstå hvordan små og isolerte populasjoner kan bli påvirket av innavl er svært viktig innen bevaringsbiologi. Innavl kan ha alvorlige konsekvenser for fitness, både på individ- og populasjonsnivå, og kan øke sjansen for ... -
Inbreeding is associated with shorter early-life telomere length in a wild passerine
Pepke, Michael Le; Niskanen, Alina Katariina; Kvalnes, Thomas; Boner, Winnie; Sæther, Bernt-Erik; Ringsby, Thor Harald; Jensen, Henrik (Peer reviewed; Journal article, 2022)Inbreeding can have negative effects on survival and reproduction, which may be of conservation concern in small and isolated populations. However, the physiological mechanisms underlying inbreeding depression are not ... -
Indirect social effects of the individual strategy in producer-scrounger foraging interactions
Pettersen, Nils Håkon (Master thesis, 2017)When animals interact socially they experience and react to phenotypes of their social partners. Such interactions can affect behaviours and fitness, and therefore opponent effects (i.e. indirect social effects) can maintain ... -
Individual variation and indirect social effects in producer-scrounger behavior in groups of house sparrows, Passer domesticus
Lilleng, Simen (Master thesis, 2019)Sosial foringsatferd involverer intraspesifikk konkurranse over begrenset mattilgjengelighet som over tid har formet evolusjonen av sosiale forings strategier. Individer er del av et dynamisk sosialt miljø som ofte avhenger ... -
Individual variation and indirect social effects in Producer-Scrounger behavior in the House Sparrow, Passer domesticus
Mohammad, Talal (Master thesis, 2018)Game theory is a scenario where, at its simplest, two alternative tactics may yield different costs and benefits. Many organisms are tied to a dynamic environment where the actions, social behaviors, or even presence of ... -
Infection by a helminth parasite is associated with changes in DNA methylation in the house sparrow
Lundregan, Sarah; Mäkinen, Hannu; Buer, Amberly; Holand, Håkon; Jensen, Henrik; Husby, Arild (Peer reviewed; Journal article, 2022)Parasites can exert strong selective pressures on their hosts and influence the evolution of host immunity. While several studies have examined the genetic basis for parasite resistance, the role of epigenetics in the ... -
Inferences of genetic architecture of bill morphology in house sparrow using a high-density SNP array point to a polygenic basis
Lundregan, Sarah; Hagen, Ingerid Julie; Gohli, Jostein; Niskanen, Alina Katariina; Kemppainen, Petri; Ringsby, Thor Harald; Kvalnes, Thomas; Pärn, Henrik; Rønning, Bernt; Holand, Håkon; Ranke, Peter Sjolte; Båtnes, Anna Solvang; Selvik, Linn-Karina M.; Lien, Sigbjørn; Sæther, Bernt-Erik; Husby, Arild; Jensen, Henrik (Journal article; Peer reviewed, 2018)Understanding the genetic architecture of quantitative traits can provide insights into the mechanisms driving phenotypic evolution. Bill morphology is an ecologically important and phenotypically variable trait, which is ...