Browsing NTNU Open by Author "Jensen, Henrik"
Now showing items 21-40 of 103
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The ecological and evolutionary role of telomere length in house sparrows
Pepke, Michael Le (Doctoral theses at NTNU;2021:420, Doctoral thesis, 2021)Telomeres, the DNA sequences capping the ends of linear chromosomes, are ancient molecular structures that are shared among most eucaryotes. The telomeres protect chromosomes from degradation and are vital to genome ... -
“Effect of inbreeding on egg size and clutch size in an insular house sparrow metapopulation in northern Norway”
Gholami, Fatemeh (Master thesis, 2023)Innavlsdepresjon er en av de største truslene mot overlevelsen til små, isolerte bestander. For å få en fullstendig forståelse av innavlens innvirkning på populasjonens levedyktighet er det nødvendig å kvantifisere ... -
The Effect of Management on Effective Population Size in the Arctic Fox (Vulpes lagopus) Metapopulation in Scandinavia.
Andersskog, Ida Pernille Øystese (Master thesis, 2017)Estimates of effective population size (Ne) may provide insight to patterns of changes in allele frequencies and heterozygosity in a population. Furthermore, by estimating Ne, one can predict future changes in genetic ... -
Effective size of density dependent populations in fluctuating environments
Myhre, Ane Marlene (Doctoral theses at NTNU;2017:156, Doctoral thesis, 2017)Knowledge of the effective size of populations, Ne, and the ratio of effective population size to the size of the mature population Ne/N, provide important information of the genetic diversity and fitness of populations. ... -
Effects and recovery of larvae of the cold-water coral Lophelia pertusa (Desmophyllum pertusum) exposed to suspended bentonite, barite and drill cuttings
Järnegren, Nina Johanna; Brooke, Sandra; Jensen, Henrik (Peer reviewed; Journal article, 2020)Fossil fuel drilling operations create sediment plumes and release waste materials into the ocean. These operations sometimes occur close to sensitive marine ecosystems, such as cold-water corals. While there have been ... -
Effects of energetic state and social environment on individual foraging strategies in a population of house sparrows, Passer domesticus
Guldvik, Martin (Master thesis, 2023)Hvordan variasjon i adferd blant individer som er del av samme populasjon or er utsatt for de samme seleksjonstrykkene blir vedlikeholdt, er ennå uvisst blant evolusjonsbiologer, siden de forventes å ha utviklet de samme ... -
Effects of inbreeding on lay date in house sparrows (Passer domesticus)
Muller, Amandine Sophie (Master thesis, 2021)Innavlsdepresjon (en reduksjon i individuell fitness forårsaket av innavl) har blitt observert hos mange ulike arter, men mekanismene som gir innavlsdepresjon er fremdeles uklare. Innavl og innavlsdepresjon studeres vanligvis ... -
“Effects of inbreeding on nestling fitness in an insular house sparrow metapopulation in northern Norway”
Ghimire, Kiran (Master thesis, 2022)Inbreeding may contribute to the extinction risk of small and fragmented populations by reducing individual fitness (inbreeding depression). Quantifying inbreeding depression (ID) in early life-stages is vital for understanding ... -
Effects of individual variation on social foraging dynamics in the house sparrow, Passer domesticus
Zeiner-Henriksen, Tuva (Master thesis, 2023)Personlighet hos dyr blir definert som konsekvente individuelle forskjeller i gjennomsnittlig atferd. I et sosialt miljø kan slike forskjeller bli formet av individuelle iboende egenskaper, samt indirekte fitness-effekter ... -
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 ... -
Environmental, geographical and time-related impacts on avian malaria infections in native and introduced populations of house sparrows (Passer domesticus), a globally invasive species
Ferraguti, Martina; Magallanes, Sergio; Jiménez-Peñuela, Jéssica; Martínez-de la Puente, Josué; Garcia-Longoria, Luz; Figuerola, Jordi; Muriel, Jaime; Albayrak, Tamer; Bensch, Staffan; Bonneaud, Camille; Clarke, Rohan H.; Czirják, Gábor Á.; Dimitrov, Dimitar; Espinoza, Kathya; Ewen, John G.; Ishtiaq, Farah; Flores-Saavedra, Wendy; Garamszegi, László Zsolt; Hellgren, Olof; Horakova, Dita; Huyvaert, Kathryn P.; Jensen, Henrik; Križanauskienė, Asta; Lima, Marcos R.; Lujan-Vega, Charlene; Magnussen, Eyðfinn; Martin, Lynn B.; Matson, Kevin D.; Møller, Anders Pape; Munclinger, Pavel; Palinauskas, Vaidas; Pap, Péter L.; Pérez-Tris, Javier; Renner, Swen C.; Ricklefs, Robert; Scebba, Sergio; Sehgal, Ravinder N. M.; Soler, Manuel; Szöllősi, Eszter; Valkiūnas, Gediminas; Westerdahl, Helena; Zehtindjiev, Pavel; Marzal, Alfonso (Peer reviewed; Journal article, 2023)Aim The increasing spread of vector-borne diseases has resulted in severe health concerns for humans, domestic animals and wildlife, with changes in land use and the introduction of invasive species being among the main ... -
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 ...