• Are cuckoos maximizing egg mimicry by selecting host individuals with better matching egg phenotypes? 

      Antonov, Anton Tinchov; Stokke, Bård Gunnar; Fossøy, Frode; Ranke, Peter Sjolte; Liang, Wei; Yang, Canchao; Moksnes, Arne; Shykoff, Jacqui A.; Røskaft, Eivin (Journal article; Peer reviewed, 2012)
      Background: Avian brood parasites and their hosts are involved in complex offence-defense coevolutionary arms races. The most common pair of reciprocal adaptations in these systems is egg discrimination by hosts and egg ...
    • 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 ...
    • A dead giveaway: Foraging vultures and other avian scavengers respond to auditory cues 

      Jackson, Craig Ryan; Maddox, Thomas M; Mbise, Franco Peniel; Stokke, Bård Gunnar; belant, Jerrold L.; Bevanger, Kjetil Modolv; Durant, Sarah M.; Fyumagwa, R.D.; Ranke, Peter Sjolte; Røskaft, Eivin; May, Roelof Frans; Fossøy, Frode (Peer reviewed; Journal article, 2020)
      Carrion represents an unpredictable and widely distributed primary food source for vultures and other avian scavengers. Avian scavengers in African savanna ecosystems are reported to rely exclusively on visual stimuli to ...
    • Demographic and genetic consequences of dispersal in house sparrows 

      Ranke, Peter Sjolte (Doctoral theses at NTNU;2019:24, Doctoral thesis, 2019)
      The importance of dispersal in population dynamics is widely acknowledged. Key to understand population consequences of dispersal is by quantifying the demographic and genetic contribution from dispersers. The influence ...
    • Demographic influences of translocated individuals on a resident population of house sparrows 

      Ranke, Peter Sjolte; Skjelseth, Sigrun; Pärn, Henrik; Herfindal, Ivar; Borg Pedersen, Åsa Alexandra; Stokke, Bård Gunnar; Kvalnes, Thomas; Ringsby, Thor Harald; Sæther, Bernt-Erik; Jensen, Henrik (Journal article; Peer reviewed, 2017)
      Translocation of individuals from source populations to augment small populations facing risk of extinction is an important conservation tool. Here we examine sex-specific differences between resident and translocated house ...
    • Dispersal in a house sparrow metapopulation: An integrative case study of genetic assignment calibrated with ecological data and pedigree information 

      Saatoglu, Fikriye Dilan; Niskanen, Alina Katariina; Kuismin, Markku; Ranke, Peter Sjolte; Hagen, Ingerid Julie; Araya-Ajoy, Yimen; Kvalnes, Thomas; Pärn, Henrik; Rønning, Bernt; Ringsby, Thor Harald; Sæther, Bernt-Erik; Husby, Arild; Sillanpää, Mikko J.; Jensen, Henrik (Peer reviewed; Journal article, 2021)
      Dispersal has a crucial role determining ecoevolutionary dynamics through both gene flow and population size regulation. However, to study dispersal and its consequences, one must distinguish immigrants from residents. ...
    • Do carnivore surveys match reports of carnivore presence by pastoralists? A case of the eastern Serengeti ecosystem 

      Mbise, Franco Peniel; Jackson, Craig Ryan; Lyamuya, Richard; Fyumagwa, Robert D.; Ranke, Peter Sjolte; Røskaft, Eivin (Peer reviewed; Journal article, 2020)
      Human-carnivore encounters are common where humans and wild carnivores share the same landscape. The frequency of such encounters gives insight regarding carnivore density and might correlate with human-carnivore conflict ...
    • Drivers of conservation crimes in the Rungwa-Kizigo-Muhesi Game Reserves, Central Tanzania 

      Hariohay, Kwaslema Malle; Ranke, Peter Sjolte; Fyumagwa, Robert D.; Kideghesho, Jafari; Røskaft, Eivin (Journal article; Peer reviewed, 2019)
      Conservation crimes are posing serious threats to wildlife species and biodiversity of the Rungwa-Kizigo-Muhesi-Game-Reserves. Devising effective strategies to reduce risks to as low as reasonably possible of these crimes, ...
    • Home range and excursive post-breeding movements of Eurasian Eagle-owls revealed by GPS satellite transmitters 

      Heggøy, Oddvar; Aarvak, Tomas; Ranke, Peter Sjolte; Solheim, Roar; Øien, Ingar Jostein (Peer reviewed; Journal article, 2021)
      Investigating space use of wild birds provides important knowledge of bird behavior and ecology, which is crucial in the management and conservation of threatened species. In the present study, we used GPS satellite telemetry ...
    • How does human disturbance affect brood parasitism and nest predation in hosts inhabiting a highly fragmented landscape? 

      Nahid, Mominul Islam; Fossøy, Frode; Stokke, Bård Gunnar; Begum, Sajeda; Røskaft, Eivin; Ranke, Peter Sjolte (Peer reviewed; Journal article, 2020)
      Human disturbance represents a considerable challenge for the conservation of living organisms and has profound negative impacts globally. There is substantial variation in how species respond to human disturbance. The ...
    • Human habituation reduces hyrax flight initiation distance in Serengeti 

      Mbise, Franco Peniel; Fredriksen, Kari-Elise; Ranke, Peter Sjolte; Jackson, Craig Ryan; Fyumagwa, Robert D.; Holmern, Tomas; Fossøy, Frode; Røskaft, Eivin (Journal article; Peer reviewed, 2019)
      Many animal populations are exposed to disturbance originating from human activities. In response to human disturbance, certain animals display a variety of potentially costly behavioural responses, such as increased ...
    • 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 ...
    • Nest site selection in a population of great reed warblers Acrocephalus arundinaceus parasitized by the common cuckoo Cuculus canorus 

      Ranke, Peter Sjolte (Master thesis, 2010)
      In avian parasite-host systems, the risk of parasitism is a potential selective agent for nest site selection. According to the spatial habitat structure hypothesis, host individuals that occupy nest site territories close ...
    • Sex Allocation in Relation to Host Races in the Brood-Parasitic Common Cuckoo (Cuculus canorus) 

      Fossøy, Frode; Moksnes, Arne; Røskaft, Eivin; Antonov, Anton Tinchov; Dyrcz, Andrzej; Moskát, Csaba; Ranke, Peter Sjolte; Rutila, Jarkko; Vikan, Johan Reinert; Stokke, Bård Gunnar (Journal article; Peer reviewed, 2012)
      Sex allocation theory and empirical evidence both suggest that natural selection should favour maternal control of offspring sex ratio in relation to their ability to invest in the offspring. Generalist parasites constitute ...
    • Spatial structure and dispersal dynamics in a house sparrow metapopulation 

      Ranke, Peter Sjolte; Araya-Ajoy, Yimen; Ringsby, Thor Harald; Pärn, Henrik; Rønning, Bernt; Jensen, Henrik; Wright, Jonathan; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)
      The effects of spatial structure on metapopulation dynamics depend upon the interaction between local population dynamics and dispersal, and how this relationship is affected by the geographical isolation and spatial ...
    • Variation in generation time reveals density regulation as an important driver of pace of life in a bird metapopulation 

      Araya-Ajoy, Yimen; Niskanen, Alina Katariina; Froy, Hannah; Ranke, Peter Sjolte; Kvalnes, Thomas; Rønning, Bernt; Pepke, Michael Le; Jensen, Henrik; Ringsby, Thor Harald; Sæther, Bernt-Erik; Wright, Jonathan (Journal article; Peer reviewed, 2021)
      Generation time determines the pace of key demographic and evolutionary processes. Quantified as the weighted mean age at reproduction, it can be studied as a life-history trait that varies within and among populations and ...