Browsing NTNU Open by Author "Herfindal, Ivar"
Now showing items 41-57 of 57
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Predator co-occurrence in alpine and Arctic tundra in relation to fluctuating prey
Rød-Eriksen, Lars; Killengreen, Siw Turid; Ehrich, Dorothee; Ims, Rolf Anker; Herfindal, Ivar; Landa, Arild; Eide, Nina Elisabeth (Peer reviewed; Journal article, 2022)1. Large carnivores influence ecosystem dynamics in multiple ways, for example, by suppressing meso-carnivores and providing carrions for smaller scavengers. Loss of large carnivores is suggested to cause meso-carnivore ... -
Raccoon dogs in Norway - potential expansion rate, distribution area and management implications
Melis, Claudia; Nordgård, Hanne; Herfindal, Ivar; Kauhala, Kaarina; Åhlén, P-A; Strann, Karl-Birger; Andersen, Reidar (NTNU Vitenskapsmuseet Rapport Zoologisk Serie, 0802-0833; 2007:3, Research report, 2007) -
The role of life history and movement in spatial population synchrony: Theoretical and empirical investigations
Martin, Ellen Claire (Doctoral theses at NTNU;2023:367, Doctoral thesis, 2023)Spatial population synchrony, the correlated fluctuation of population abundances in different places, is common between populations of the same species and an important predictor of extinction risk. Spatially separated ... -
The role of seasonal migration in spatial population synchrony
Martin, Ellen Claire; Hansen, Brage Bremset; Herfindal, Ivar; Lee, Aline Magdalena (Peer reviewed; Journal article, 2023)Spatially synchronized population dynamics are common in nature, and understanding their causes is key for predicting species persistence. A main driver of synchrony between populations of the same species is shared ... -
Seasonal and Diurnal Variation in Habitat Overlap of Roe Deer and Eurasian Lynx in a Human-Dominated Landscape
Utsi, Anne Isabelle (Master thesis, 2015)Predators affect prey directly (lethally), and indirectly (non-lethally), by altering their behaviour as they try to maximise habitat overlap with prey. Prey, on the other hand, are trying to minimise habitat overlap with ... -
Selecting habitat to survive: The impact of road density on survival in a large carnivore
Basille, Mathieu; Van Moorter, Bram F. A.; Herfindal, Ivar; Martin, Jodie; Linnell, John Durrus; Odden, John; Andersen, Reidar; Gaillard, Jean-Michel (Journal article; Peer reviewed, 2013)Habitat selection studies generally assume that animals select habitat and food resources at multiple scales to maximise their fitness. However, animals sometimes prefer habitats of apparently low quality, especially when ... -
Sex-specific space use patterns in wild alpine reindeer: potential consequences for disease transmission
Hjermann, Tilde Katrina Slotte (Master thesis, 2021)Dyrs bevegelsesmønstre påvirker mange økologiske prosesser, som til syvende og sist påvirker individets fitness. I tillegg til den romlige skalaen av individets bevegelser, for eksempel målt i størrelsen på sesongmessige ... -
Spatial heterogeneity in climate change effects decouples the long‐term dynamics of wild reindeer populations in the high Arctic
Hansen, Brage Bremset; Pedersen, Åshild Ønvik; Peeters, Bart; Le Moullec, Mathilde; Albon, Steve D.; Herfindal, Ivar; Sæther, Bernt-Erik; Grøtan, Vidar; Aanes, Ronny (Journal article; Peer reviewed, 2019)The ‘Moran effect’ predicts that dynamics of populations of a species are synchronized over similar distances as their environmental drivers. Strong population synchrony reduces species viability, but spatial heterogeneity ... -
Spatial scaling of population synchrony in marine fish depends on their life history
Fredricson Marquez, Jonatan; Lee, Aline Magdalena; Aanes, Sondre; Engen, Steinar; Herfindal, Ivar; Salthaug, Are; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2019)The synchrony of population dynamics in space has important implications for ecological processes, for example affecting the spread of diseases, spatial distributions and risk of extinction. Here, we studied the relationship ... -
Spatial variation in the relationship between performance and metabolic rate in wild juvenile Atlantic salmon
Robertsen, Grethe; Armstrong, JD; Nislow, KH; Herfindal, Ivar; Mckelvey, S; Einum, Sigurd (Journal article; Peer reviewed, 2014)Maintenance of metabolic rate (MR, the energy cost of self-maintenance) is linked to behavioural traits and fitness and varies substantially within populations. Despite having received much attention, the causes and ... -
Spatiotemporal variation in climatic conditions across ecosystems
Herfindal, Ivar; Aanes, Sondre; Benestad, Rasmus; Finstad, Anders Gravbrøt; Salthaug, Are; Stenseth, Nils Christian; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)Environmental variation in time and space affects biological processes such as extinction risk and speed of adaptation to environmental change. The spatial structure of environmental variation may vary among ecosystems, ... -
Subtle foodscape displacement of a native ungulate by free-ranging livestock in a forest agroecosystem
Wam, Hilde Karine; Herfindal, Ivar (Journal article; Peer reviewed, 2018)The prevalence of livestock grazing in wildlife area s is increasing. This transformation of ecosys- tems into agroecosystems is concerning because the intr oduction of new species may cause niche displacement of the ... -
Sustainable management of populations impacted by harvesting and climate change
Stenseth, Nils Christian; Ims, Rolf Anker; Sæther, Bernt-Erik; Cadahia, Luis; Herfindal, Ivar; Lee, Aline Magdalena; Whittington, Jason D; Yoccoz, Nigel (Peer reviewed; Journal article, 2022)The sustainable use of natural resources is critical for addressing the global challenges of today. Strategies for sustainable harvesting need to consider not only harvested species, but also other non-harvested species ... -
Temporal and spatial variation in juvenile roe deer body mass
Lauvli, Elin Ovidia (Master thesis, 2020)Kroppsvekt tidlig i livet kan være en god indikator for hvor godt et individ vil gjøre det senere i livet. Det er derfor viktig å forstå de forskjellige mekanismene som påvirker kroppsvekt. Værforhold kan ha stor effekt ... -
Use, selection, and home range properties: complex patterns of individual habitat utilization
Ofstad, Endre Grüner; Herfindal, Ivar; Solberg, Erling Johan; Heim, Morten; Rolandsen, Christer Moe; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2019)Individual patterns of habitat use emerge from behavioral decisions driven by interactions between landscape characteristics and individual traits. Individual traits, such as age and sex, influence the net gain of using ... -
Variation in recruitment failure of moose (Alces alces) - any effects of population condition and climate?
Markussen, Stine Svalheim (Master thesis, 2011)Summary1. Recruitment failure may represent an important demographic response to changes in the environment or in population size. In this study, I examined whether there was a positive relationship between recruitment ... -
Weather affects temporal niche partitioning between moose and livestock
Herfindal, Ivar; Lande, Unni Støbet; Solberg, Erling Johan; Rolandsen, Christer Moe; Roer, Ole; Wam, Hilde Karine (Journal article; Peer reviewed, 2017)Co-existing species at the same trophic level often segregate with respect to diet, habitat use, or spatial distribution, reducing their direct competition for resources. However, temporal patterns in species-specific ...