Blar i NTNU Open på forfatter "Herfindal, Ivar"
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Influence of migratory ungulate management on competitive interactions with resident species in a protected area
Anderwald, Pia; Herfindal, Ivar; Haller, Rudolf; Risch, Anita C.; Schütz, Martin; Schweiger, Anna K.; Filli, Flurin (Journal article; Peer reviewed, 2015)Migratory animals can represent links between protected and unprotected parts of their home ranges. Management of such species outside a conservation area can influence species interactions inside the protected zone. This ... -
Lack of sex-specific movement patterns in an alien species at its invasion front - consequences for invasion speed
Herfindal, Ivar; Melis, Claudia; Åhlén, Per-Arne; Dahl, Fredrik (Journal article; Peer reviewed, 2016)Efficient targeting of actions to reduce the spread of invasive alien species relies on understanding the spatial, temporal, and individual variation of movement, in particular related to dispersal. Such patterns may differ ... -
Large-scale spatiotemporal variation in road mortality of moose: Is it all about population density?
Rolandsen, Christer Moe; Solberg, Erling Johan; Herfindal, Ivar; Van Moorter, Bram F. A.; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2011)Ungulate‐vehicle collisions (UVC) constitute a widespread and increasing problem in large parts of the world. This has generated an intensive search for mitigating measures, but often based on a weak understanding of the ... -
Life history consequences of environmental variation along ecological gradients in northern ungulates
Herfindal, Ivar (Doktoravhandlinger ved NTNU, 1503-8181; 2006:15, Doctoral thesis, 2006)Temporal and spatial variation in the environment can influence the performance of individuals in wild ungulate populations. Of particular importance is an understanding of the mechanisms that shape variation in individual ... -
Matvalg hos sau og storfe på skogsbeite
Wam, Hilde Karine; Herfindal, Ivar (NIBIO Rapport;, Research report, 2020)I ‘Skogsbeite-prosjektet’ (2012-2015) undersøkte vi matvalg hos sau og storfe på beite i produktiv lavlandsskog. Studien ble gjort i tre områder med ulik tetthet av dyr (ca. 17 dyr/km2 i Nannestad, 36 dyr/km2 på Vestskauen ... -
Modellering av tap av tamrein til rovvilt - en risikomodell
Herfindal, Ivar; Brøseth, Henrik; Kjørstad, Morten Andre; Linnell, John Durrus; Odden, John; Persson, Jens; Stien, Audun; Tveraa, Torkild; Ersson, L. (NINA rapport;819, Research report, 2012)I januar 2011 fikk NINA i oppdrag av Direktoratet for naturforvaltning (DN) å vurdere om tilgjengelige forskningsdata kunne brukes til modellering av risikobasert erstatning for tap av tamrein til rovvilt. Oppdraget ble ... -
Moose Alces alces habitat use at multiple temporal scales in a human-altered landscape
Bjørneraas, Kari; Solberg, Erling Johan; Herfindal, Ivar; Van Moorter, Bram; Rolandsen, Christer Moe; Tremblay, Jean-Pierre; Skarpe, Christina; Sæther, Bernt-Erik; Eriksen, Rune; Astrup, Rasmus (Journal article; Peer reviewed, 2011)Habitat alteration by humans may change the supply of food and cover for wild ungulates, but few studies have examined how these resources are utilised over time by individuals of different sex and reproductive status. We ... -
On fitness and partial migration in a large herbivore – migratory moose have higher reproductive performance than residents
Rolandsen, Christer Moe; Solberg, Erling Johan; Sæther, Bernt-Erik; Van Moorter, Bram; Herfindal, Ivar; Bjørneraas, Kari (Journal article; Peer reviewed, 2016)Partially migratory populations comprise both resident and migratory individuals. Th ese tactics may coexist if their demographic contribution to future generations (i.e. fitness) are equal or vary temporally with environmental ... -
Opposing fitness consequences of habitat use in a harvested moose population
Ofstad, Endre Grüner; Markussen, Stine Svalheim; Sæther, Bernt-Erik; Solberg, Erling Johan; Heim, Morten; Haanes, Hallvard; Røed, Knut; Herfindal, Ivar (Peer reviewed; Journal article, 2020)1. Landscape changes are happening at an unprecedented pace, and together with high levels of wildlife harvesting humans have a large effect on wildlife populations. A thorough knowledge of their combined influence on ... -
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) -
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 ... -
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 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 ... -
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 ... -
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 ...