Browsing Brage NMBU by Author "Steyaert, Sam"
Now showing items 1-18 of 18
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A human-induced landscape of fear influences foraging behavior of brown bears
Lodberg-Holm, Hanna Kavli; Gelink, Henriette Wathne; Hertel, Anne Gabriela; Swenson, Jon; Domevscik, Matej; Steyaert, Sam (Journal article; Peer reviewed, 2019)Animals adapt their foraging behavior to variations in food availability and predation risk. In Sweden, brown bears (Ursus arctos) depend on a nearly continuous intake of berries, especially bilberries (Vaccinium myrtillus) ... -
Arthropod succession following a mass mortality event of reindeer (Rangifer tarandus) in an Alpine ecosystem
Westermann, Lina (Master thesis, 2020)Carcasses are of great ecological importance, especially as a resource for arthropods. However, many aspects of carrion ecology remain to be investigated. One of these aspects is the ecological significance of mass mortality ... -
Bears and berries: species-specific selective foraging on a patchily distributed food resource in a human-altered landscape
Hertel, Anne Gabriela; Steyaert, Sam; Zedrosser, Andreas; Mysterud, Atle; Lodberg-Holm, Hanna Kavli; Gelink, Henriette Wathne; Kindberg, Jonas; Swenson, Jon (Peer reviewed; Journal article, 2016)When animals are faced with extraordinary energyconsuming events, like hibernation, finding abundant, energy-rich food resources becomes particularly important. The profitability of food resources can vary spatially, ... -
Caught in the mesh: roads and their network-scale impediment to animal movement
Bischof, Richard; Steyaert, Sam; Kindberg, Jonas (Journal article; Peer reviewed, 2017)Roads have a pervasive multi-faceted influence on ecosystems, including pronounced impacts on wildlife movements. In recognition of the scale-transcending impacts of transportation infrastructure, ecologists have been ... -
Change in arthropod communities following a mass death incident of reindeer at Hardangervidda
Granum, Heidi Mørkhagen (Master thesis, 2019)Decomposition of dead material is a vital part of ecology, and an important process in every ecosystem. Dead animals are likely to play a major part in sustaining species that specialize on scavenging. The highly nutrient ... -
Denning ecology of Scandinavian brown bears (Ursus Arctos) in a dynamic landscape
Mannaart, Alja Helene Irena (Master thesis, 2016-08-31)Human encroachment, habitat fragmentation, resource exploitation, and hunting can affect the presence, habitat use, behavior, life history, and population dynamics of wildlife species. Wide-ranging large mammals with low ... -
Ecological implications from spatial patterns in human-caused brown bear mortality
Steyaert, Sam; Zedrosser, Andreas; Elfström, Marcus; Ordiz Fernandez, Andres Avelino; Leclerc, Martin; Frank, Shane; Kindberg, Jonas; Støen, Ole-Gunnar; Brunberg, Sven; Swenson, Jon (Journal article; Peer reviewed, 2016)Humans are important agents of wildlife mortality, and understanding such mortality is paramount for effective population management and conservation. However, the spatial mechanisms behind wildlife mortality are often ... -
Ecological implications from spatial patterns in human-caused brown bear mortality
Steyaert, Sam; Zedrosser, Andreas; Elfström, Marcus; Ordiz Fernandez, Andres Avelino; Leclerc, Martin; Frank, Shane; Kindberg, Jonas; Støen, Ole-Gunnar; Brunberg, Sven; Swenson, Jon (Journal article; Peer reviewed, 2016) -
Endozoochory by brown bears stimulates germination in bilberry
Steyaert, Sam; Hertel, Anne Gabriela; Swenson, Jon (Peer reviewed; Journal article, 2019)The understory vegetation of the Eurasian boreal forest is dominated by several ericaceous species (e.g. bilberry Vaccinium myrtillus). These species invest large amounts of energy in their sexual reproduction by producing ... -
Heritability of head size in a hunted large carnivore, the brown bear (Ursus arctos)
Rivrud, Inger Maren; Frank, Shane; Bischof, Richard; Mysterud, Atle; Steyaert, Sam; Hertel, Anne Gabriela; Hagen, Snorre; Eiken, Hans Geir; Swenson, Jon; Zedrosser, Andreas (Journal article; Peer reviewed, 2019)Wild animal populations experience selection pressures from both natural and anthropogenic sources. The availability of extensive pedigrees is increasing along with our ability to quantify the heritability and evolvability ... -
Hunting promotes sexual conflict in brown bears
Gosselin, Jacinthe; Leclerc, Martin; Zedrosser, Andreas; Steyaert, Sam; Swenson, Jon; Pelletier, Fanie (Journal article; Peer reviewed, 2017)The removal of individuals through hunting can destabilize social structure, potentially affecting population dynamics. Although previous studies have shown that hunting can indirectly reduce juvenile survival through ... -
Niche differentiation among boreal mammals and birds regarding their roles as endozoochorical seed dispersers
Liebe, Hauk (Master thesis, 2019)Plant seed dispersal by endozoochory (seed dispersal via the digestive system of animals) is an important process affecting plant species composition in ecosystems. Recent studies in temperate regions have shown that a ... -
Predation-induced ungulate carcasses mediate vegetation composition in the boreal ecosystem
Olsen, Marte (Master thesis, 2017)Apex carnivores are mostly recognized for their effects on ecosystem processes through altering population dynamics and behaviour of their prey. Apex carnivores may also affect lower trophic levels through the distribution ... -
Reindeer carcasses provide foraging habitat for insectivorous birds of the alpine tundra
Badia, Rudy; Steyaert, Sam; Puliti, Stefano; Blaalid, Rakel; Frank, Shane (Peer reviewed; Journal article, 2019)On August of 2016, almost an entire herd (n = 323) of wild tundra reindeer (Rangifer tarandus) was killed by lightning on Hardangervidda in southern Norway. While conducting fieldwork for another study in 2017, we ... -
Seasonal and annual variation in the diet of brown bears Ursus arctos in the boreal forest of southcentral Sweden
Stenset, Nina Emilie; Lutnæs, Paul Antoni Nilsen; Bjarnadóttir, Valgerður; Dahle, Bjørn Steinar; Fossum, Kristin Høivik; Jigsved, Patrick; Johansen, Thomas; Neumann, Wiebke; Opseth, Ole; Rønning, Oddmund; Steyaert, Sam; Zedrosser, Andreas; Brunberg, Sven; Swenson, Jon (Journal article; Peer reviewed, 2016)Understanding a species' feeding ecology is essential for successful management and conservation, because food abundance can influence body mass, survival, reproductive success, movements, and habitat use. We describe ... -
Selection of trees marked by rubbing by Andean bears in the Peruvian dry forest
Kleiner, Jack (Master thesis, 2016-08-31)The Andean bear (Tremarctus ornatus) is one of the least known species of Ursidae. One area about which very little is known is the bear’s marking behavior. This is a key aspect of bear ecology and marks can give information ... -
Temporal effects of hunting on foraging behavior of an apex predator: Do bears forego foraging when risk is high?
Hertel, Anne Gabriela; Zedrosser, Andreas; Mysterud, Atle; Støen, Ole-Gunnar; Steyaert, Sam; Swenson, Jon (Journal article; Peer reviewed, 2016)Avoiding predators most often entails a food cost. For the Scandinavian brown bear (Ursus arctos), the hunting season coincides with the period of hyperphagia. Hunting mortality risk is not uniformly distributed throughout ... -
To ban or not to ban? : spatial and temporal effects of banning long-term supplementary feeding on red deer space use, forest browsing damage and the performance and nitrogen content of bilberry plants
Zimmermann, Maximilian Matthias (Master thesis, 2020)Supplementary feeding (i.e. diversionary feeding) of red deer (Cervus elaphus) and other cervids is a widespread tool in wildlife management in Europe and North America. In 2016 supplementary feeding was banned in Norway ...