Browsing NTNU Open by Author "Araya-Ajoy, Yimen"
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Characterizing morphological (co)variation using structural equation models: Body size, allometric relationships and evolvability in a house sparrow metapopulation
Araya-Ajoy, Yimen; Ranke, Peter Sjolte; Kvalnes, Thomas; Rønning, Bernt; Holand, Håkon; Myhre, Ane Marlene; Pärn, Henrik; Jensen, Henrik; Ringsby, Thor Harald; Sæther, Bernt-Erik; Wright, Jonathan (Peer reviewed; Journal article, 2019)Body size plays a key role in the ecology and evolution of all organisms. Therefore, quantifying the sources of morphological (co)variation, dependent and independent of body size, is of key importance when trying to ... -
Circadian rhythms of urinary cortisol levels vary between individuals in wild male chimpanzees: A reaction norm approach
Sonnweber, Ruth; Araya-Ajoy, Yimen; Behringer, Verena; Deschner, Tobias; Tkaczynski, Patrick; Fedurek, Pawel; Preis, Anna; Samuni, Liran; Zommers, Zinta; Gomes, Cristina; Zuberbühler, Klaus; Wittig, Roman M.; Crockford, Catherine (Journal article; Peer reviewed, 2018)Investigating the repeatability of trait variation between individuals, that is the amount of individual variation in relation to overall phenotypic variation, indicates an upper level of heritability and reveals whether ... -
Demographic measures of an individual's "pace of life": fecundity rate, lifespan, generation time, or a composite variable?
Araya-Ajoy, Yimen; Bolstad, Geir Hysing; Brommer, Jon; Careau, Vincent; Dingemanse, Niels J.; Wright, Jonathan (Journal article; Peer reviewed, 2018)Comparative analyses have demonstrated the existence of a ^pace-of-life^ (POL) continuum of life-history strategies, from fastreproducing short-lived species to slow-reproducing long-lived species. This idea has been ... -
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 ... -
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 ... -
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 ... -
Provisioning tactics of great tits (Parus major) in response to long-term brood size manipulations differ across years
Mathot, Kimberley J; Olsen, Anne-Lise; Mutzel, Ariane; Araya-Ajoy, Yimen; Nicolaus, Marion; Westneat, David F.; Wright, Jonathan; Kempenaers, Bart; Dingemanse, Niels J. (Journal article; Peer reviewed, 2017)Parents provisioning their offspring can adopt different tactics to meet increases in offspring demand. In this study, we experimentally manipulated brood demand in free living great tits (Parus major) via brood size ... -
Sources of (co)variation in alternative siring routes available to male great tits (Parus major)
Araya-Ajoy, Yimen; Kuhn, Sylvia; Mathot, Kimberley J; Mouchet, Alexia; Mutzel, Ariane; Nicolaus, Marion; Wijmenga, Jan J; Kempenaers, Bart; Dingemanse, Niels J. (Journal article; Peer reviewed, 2016)Males of socially monogamous species can increase their siring success via within-pair and extra-pair fertilizations. In this study, we focused on the different sources of (co)variation between these siring routes, and ... -
The Role of Indirect Genetic Effects in Evolutionary Rescue
O'Shea, Myranda (Master thesis, 2020)Globale miljøendringer fører til en kraftig nedgang i biodiversitet og de tilhørende økosystemtjenestene. Det å forstå mekanismene som påvirker en populasjons evne til å tilpasse seg disse miljøendringene er kritisk kunnskap ...