Blar i NTNU Open på forfatter "Ringsby, Thor Harald"
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Evaluating mitigation measures to reduce negative impacts of infrastructure construction on vegetation and wildlife
Mehlhoop, Anne Catriona (Doctoral theses at NTNU;2022:48, Doctoral thesis, 2022)Evaluating mitigation measures to reduce negative impacts of infrastructure construction on vegetation and wildlife The human footprint is large and growing worldwide. Land-use related to technical infrastructure ... -
Exploring Moulting Common Eider (Somateria mollissima) Escape Responses towards Ship Traffic.
Skei, Jørgen (Master thesis, 2014)1. The construction of bottom dwelling offshore wind farms in shallow waters is expected to interfere with seabird feeding and moulting habitats. This study focus on how the disturbance from ship traffic associated with ... -
Foraging behaviour of the European shag during early chick-rearing period; do they follow the marginal value theorem?
De Rijcke, Sandra (Master thesis, 2015)1. Optimal allocation of food is essential during the breeding season, when animals have to provide food for themselves and their chicks. As central place foragers, seabirds forage away from the nest and have to balance ... -
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 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 ... -
Identifying Conservative Criteria for (environmental) Assessments of Vulnerability;: Seabirds and Offshore Wind Farms as a Case Study
Gressetvold, Marit (Master thesis, 2013)The approach is based on four criterias; 1) elasticity of adult and juvenile survival on population growth rate, 2) redlist status and 3) local abundances and 4) flight properties. I also investigated whether the different ... -
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 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 ... -
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 ... -
Insights into the genetic architecture of morphological and sexually selected traits in two passerine bird species
Silva, Catarina; McFarlane, S. Eryn; Hagen, Ingerid Julie; Rönnegård, Lars; Billing, Anna; Kvalnes, Thomas; Kemppainen, Petri; Rønning, Bernt; Ringsby, Thor Harald; Sæther, Bernt-Erik; Qvarnström, Anna; Ellegren, Hans; Jensen, Henrik; Husby, Arild (Journal article; Peer reviewed, 2017)Knowledge about the underlying genetic architecture of phenotypic traits is needed to understand and predict their evolutionary dynamics. The number of causal loci underlying most phenotypic traits, the magnitude of their ... -
Is basal metabolic rate associated with recruit production and survival in free-living house sparrows?
Rønning, Bernt; Broggi, Juli; Bech, Claus; Moe, Børge; Ringsby, Thor Harald; Pärn, Henrik; Hagen, Ingerid Julie; Sæther, Bernt-Erik; Jensen, Henrik (Journal article; Peer reviewed, 2016)Life history theory predicts that available energy is limited and needs to be allocated among different processes such as growth, reproduction and self-maintenance. Basal metabolic rate (BMR), a common measure of an animal's ... -
Life history traits and demography of a mountain bird under climatic variation
Eriksen, Lasse Frost (Doctoral theses at NTNU;2024:90, Doctoral thesis, 2024)Ongoing climate change can be expected to have major consequences for many species and ecosystems. Effects have been reported on reproduction, survival and movement ecology, with potential impacts for population dynamics ... -
Linking variation in personality and behavioural syndromes to social foraging and producer-scrounger effects in house sparrows (Passer domesticus)
Olsen, Mirja Carola (Master thesis, 2016)Consistent behavioural differences between individuals across time and situations are referred to as animal personality. Associated with this are behavioural syndromes , which are suites of correlated behaviours across ... -
Longitudinal telomere dynamics within natural lifespans of a wild bird
Pepke, Michael Le; Kvalnes, Thomas; Wright, Jonathan; Araya Ajoy, Yimen Gerardo; Ranke, Peter Sjolte; Boner, Winnie; Monaghan, Pat; Sæther, Bernt-Erik; Jensen, Henrik; Ringsby, Thor Harald (Peer reviewed; Journal article, 2023)Telomeres, the nucleotide sequences that protect the ends of eukaryotic chromosomes, shorten with each cell division and telomere loss may be influenced by environmental factors. Telomere length (TL) decreases with age in ... -
Lower survival probability of house sparrows severely infected by the gapeworm parasite
Holand, Håkon; Jensen, Henrik; Tufto, Jarle; Soliman, Mustafa M.; Pärn, Henrik; Sæther, Bernt-Erik; Ringsby, Thor Harald (Journal article; Peer reviewed, 2014)The effect of parasites in natural populations has received increasing attention in recent years. Studies have shown that parasites may play an important part in population ecology due to their potential effects on host ... -
Moose in our neighborhood: Does perceived hunting risk have cascading effects on tree performance in vicinity of roads and houses?
Mehlhoop, Anne Catriona; Van Moorter, Bram; Rolandsen, Christer Moe; Hagen, Dagmar; Granhus, Aksel; Eriksen, Rune; Ringsby, Thor Harald; Solberg, Erling Johan (Peer reviewed; Journal article, 2022)Like large carnivores, hunters both kill and scare ungulates, and thus might indirectly affect plant performance through trophic cascades. In this study, we hypothesized that intensive hunting and enduring fear of humans ... -
Nest Microclimate in Relation to Maternal Phenotypic Quality and Reproductive Success in a Wild Population of House Sparrows (Passer domesticus)
Thurmann-Nielsen, Cathrine (Master thesis, 2019)En bedre forståelse av faktorene som påvirker produksjonen av flyvedyktige unger og rekrutterende fugler er viktig for å forstå økologiske og evolusjonære prosesser. De tidligste livsstadiene er kritiske for overlevelse, ... -
No mitigating effects of roadside vegetation clearing on ungulate-vehicle collisions in Nord-Trøndelag
Lindstrøm, Ingrid Marie (Master thesis, 2016)The number of ungulate-vehicle collisions has increased substantially over the last few decades. To reduce the number of accidents several mitigation measures have been implemented, but there is in many cases no evaluation ... -
Offspring fitness and the optimal propagule size in a fluctuating environment
Kvalnes, Thomas; Røberg, Anja Ås; Jensen, Henrik; Holand, Håkon; Pärn, Henrik; Sæther, Bernt-Erik; Ringsby, Thor Harald (Journal article; Peer reviewed, 2018)