Blar i NTNU Open på forfatter "Herfindal, Ivar"
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Hjortevilt og trafikk i Norge: En analyse av hjorteviltrelaterte trafikkulykker i perioden 1970-2007
Solberg, Erling Johan; Rolandsen, Christer Moe; Herfindal, Ivar; Heim, Morten (NINA Rapport;463, Research report, 2009)Hjorteviltet er en viktig naturressurs i Norge, med stor økonomisk og rekreasjonsmessig betyd-ning for jaktrettshavere og jegere. I takt med stadig økende bestandstetthet ser vi også økende samfunnskostnader forbundet med ... -
Individual and temporal variation in habitat association of an alien carnivore at its invasion front
Melis, Claudia; Herfindal, Ivar; Dahl, Fredrik; Åhlén, Per-Arne (Journal article, 2015)Gathering information on how invasive species utilize the habitat is important, in order to better aim actions to reduce their negative impact. We studied habitat use and selection of 55 GPS-marked raccoon dogs (30 males, ... -
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 ... -
The Moran effect revisited: spatial population synchrony under global warming
Hansen, Brage Bremset; Grøtan, Vidar; Herfindal, Ivar; Lee, Aline Magdalena (Peer reviewed; Journal article, 2020)The world is spatially autocorrelated. Both abiotic and biotic properties are more similar among neighboring than distant locations, and their temporal co-fluctuations also decrease with distance. P. A. P. Moran realized ... -
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 ... -
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, ...