Blar i NTNU Open på forfatter "Ranke, Peter Sjolte"
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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 ... -
Between hunter and climate: the effects of hunting and environmental change on fecal glucocorticoid metabolite levels in two sympatric ungulate species in the Ruaha-Rungwa ecosystem, Tanzania
Hariohay, Kwaslema Malle; Hunninck, Louis Marcel; Ranke, Peter Sjolte; Fyumagwa, Robert D; Palme, Rupert; Røskaft, Eivin (Journal article; Peer reviewed, 2023) -
Causes and consequences of variation in early-life telomere length in a bird metapopulation
Pepke, Michael Le; Kvalnes, Thomas; Ranke, Peter Sjolte; Araya-Ajoy, Yimen; Wright, Jonathan; Sæther, Bernt-Erik; Jensen, Henrik; Ringsby, Thor Harald (Peer reviewed; Journal article, 2022)Environmental conditions during early-life development can have lasting effects shaping individual heterogeneity in fitness and fitness-related traits. The length of telomeres, the DNA sequences protecting chromosome ends, ... -
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 ... -
Community spatial distance and educational determinants of how local people appreciate conservation benefits around Tarangire and Saadani National Parks, Tanzania
Mbise, Franco P.; Ranke, Peter Sjolte; Røskaft, Eivin (Peer reviewed; Journal article, 2021)The understanding of how educational and spatial factors influence appreciation of conservation benefits to locals living adjacent to protected areas is a very important aspect in conservation initiatives. In this study ... -
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 ... -
Disentangling the age-dependent causal pathways affecting multiple paternity in house sparrows
Søraker, Jørgen Skavdal (Master thesis, 2022)De drivende mekanismene bak fordelingen av polygami hos sosialt monogame fuglearter har fått mye oppmerksomhet de siste tiårene. Alder og morfologi, og særlig sekundære seksuelle trekk, har ofte blitt pekt på som viktige ... -
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, ... -
Efficacy of spotlights and thermal cameras to detect lions Panthera leo and spotted hyenas Crocuta crocuta depends on species and management regime
Mwampeta, Stanslaus Brown; Wilton, Clay M.; Mkasanga, Imani J.; Bled, Florent; Masinde, Lusato M.; Røskaft, Eivin; Ranke, Peter Sjolte; Fyumagwa, Robert D.; Belant, Jerrold L. (Peer reviewed; Journal article, 2022)Accurate abundance estimates can contribute to effective management of large carnivore populations. Lion Panthera leo and spotted hyena Crocuta crocuta populations are frequently estimated at night by eliciting their ... -
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 ... -
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 ... -
Moon phase and season alter road use by lions
Mwampeta, Stanslaus Brown; Masinde, Lusato M.; Ranke, Peter Sjolte; Røskaft, Eivin; Fyumagwa, Robert; Belant, Jerrold L. (Peer reviewed; Journal article, 2023)Roads within protected areas facilitate management and tourism but can also alter animal movements and foraging opportunities. Animal tracks observed along roads are also used to index species distributions and abundance. ...