Browsing NTNU Open by Author "Wright, Jonathan"
Now showing items 21-40 of 55
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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 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 manipulated levels of predation threat on parental provisioning and nestling begging
Mutzel, Ariane; Olsen, Anne-Lise; Mathot, Kimberley J; Araya-Ajoy, Yimen; Nicolaus, Marion; Wijmenga, Jan J; Wright, Jonathan; Kempenaers, Bart; Dingemanse, Niels J. (Journal article; Peer reviewed, 2019)Parental provisioning behavior is a major determinant of offspring growth and survival, but high provisioning rates might come at the cost of increased predation threat. Parents should thus adjust provisioning activity ... -
Effekten av sosiale forstyrrelser på arealbruk og territoriestabilitet hos en aktivt forvaltet populasjon av gaupe (Lynx lynx)
Sørheim, Maja Dineh (Master thesis, 2013)Territoriell adferd og sosiale systemer har betydning for hvordan en art fordeler seg i landskapet og responderer på forstyrrelser. For å få innsikt i territorieadferden hos solitære rovdyr har jeg analysert hvordan ... -
Energy management of heterothermic bats at northern latitudes: Understanding the physiological flexibility of bats and how this enables them to live in the northern edge of their distribution
Sørås, Rune (Doctoral theses at NTNU;2023:119, Doctoral thesis, 2023)Understanding how bats manage their energy budgets under different thermal conditions is an important component in understanding the limits of distribution and their ability to cope with environmental changes, such as ... -
The evolution of extra-pair paternity and paternal care in birds
Søraker, Jørgen Skavdal; Wright, Jonathan; Hanslin, Fredrik Øglænd; Pepke, Michael Le (Journal article; Peer reviewed, 2023)Extra-pair paternity (EPP) influences the relatedness between social parents and offspring. Therefore, one might expect the level of EPP to influence levels of paternal investment. Here, we investigated the effect of ... -
Evolutionary tipping points in the capacity to adapt to environmental change
Botero, Carlos A.; Weissing, Franjo J.; Wright, Jonathan; Rubenstein, Dustin R. (Journal article; Peer reviewed, 2015)In an era of rapid climate change, there is a pressing need to understand how organisms will cope with faster and less predictable variation in environmental conditions. Here we develop a unifying model that predicts ... -
Experimental manipulation of brood size affects several levels of phenotypic variance in offspring and parent pied flycatchers
Westneat, David F.; Mutzel, Ariane; Bonner, Simon; Wright, Jonathan (Journal article; Peer reviewed, 2017)Parental provisioning of offspring should reflect selection on life history aspects of parenting and on foraging behavior. Life history and foraging theory generally make predictions about mean behavior, but some circumstances ... -
How to quantify thermal acclimation capacity?
Einum, Sigurd; Ratikainen, Irja Ida; Wright, Jonathan; Pelabon, Christophe; Bech, Claus; Jutfelt, Fredrik; Stawski, Clare; Burton, Tim (Peer reviewed; Journal article, 2019)The capacity of organisms to acclimate will influence their ability to cope with ongoing global changes in thermal regimes. Here we highlight methodological issues associated with recent attempts to quantify variation in ... -
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 ... -
Innovation as part of a wider behavioural syndrome in the guppy: The effect of sex and body size
Berdal, Monica Anderson; Rosenqvist, Gunilla; Wright, Jonathan (Journal article; Peer reviewed, 2018)Recent work on animal personalities has shown that individuals within populations often differ consistently in various types of behaviour and that many of these behaviours correlate among individuals to form behavioural ... -
Intersexual conflict over seed size is stronger in more outcrossed populations of a mixed-mating plant
Raunsgard, Astrid; Opedal, Øystein Hjorthol; Ekrem, Runa K; Wright, Jonathan; Bolstad, Geir Hysing; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2018)In polyandrous species, fathers benefit from attracting greater maternal investment toward their offspring at the expense of the offspring of other males, while mothers should usually allocate resources equally among ... -
Life-history evolution under fluctuating density-dependent selection and the adaptive alignment of pace-of-life syndromes
Wright, Jonathan; Bolstad, Geir Hysing; Araya-Ajoy, Yimen; Dingemanse, Niels J. (Journal article; Peer reviewed, 2018)We present a novel perspective on life-history evolution that combines recent theoretical advances in fluctuating density-dependent selection with the notion of pace-of-life syndromes (POLSs) in behavioural ecology. These ... -
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 ... -
Long-distance dispersal in the short-distance dispersing house sparrow (Passer domesticus)
Ranke, Peter Sjolte; Pepke, Michael Le; Søraker, Jørgen Skavdal; David, Gabriel; Araya Ajoy, Yimen Gerardo; Wright, Jonathan; Nafstad, Ådne Messel; Rønning, Bernt; Pärn, Henrik; Ringsby, Thor Harald; Jensen, Henrik; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2024)The house sparrow (Passer domesticus) is a small passerine known to be highly sedentary. Throughout a 30-year capture–mark–recapture study, we have obtained occasional reports of recoveries far outside our main metapopulation ... -
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 ... -
Network analysis of genetic relatedness using population dynamic simulations
Lundin, Thorbjørn (Master thesis, 2020)Et viktig element når det gjelder å forstå økoevolusjonær dynamikk i populasjoner er genetisk slektskap. Det har nylig blitt utviklet nye metoder som innebærer å analysere slektskapsmatrisen ved hjelp av nettverksanalyse. Her ... -
Personality and Innovation in House Sparrows - Evolutionary and Demographic Consequences of Individual Phenotypic Differences
Sommerli, Sindre Lysfjord (Master thesis, 2015)Atferdssyndromer, og kovarians mellom trekk er essensielle for forståelse av fenotypisk struktur og fenotypisk variasjon. Nyere forskning viser at atferdssyndromer ikke bare eksisterer, men at disse varierer i struktur ...