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Risk of brown bear predation on semi-domesticated reindeer calves

predation patterns, brown bear – reindeer interactions and landscape heterogeneity

Sivertsen, Therese Ramberg (2017). Risk of brown bear predation on semi-domesticated reindeer calves. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2017:50
ISBN 978-91-576-8873-6
eISBN 978-91-576-8874-3
[Doctoral thesis]

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As large carnivore populations are recovering in northern boreal ecosystems of Europe and North America, there is a need to understand how these changes in predator communities influence prey populations and ecosystems. Moreover, human-wildlife conflicts are frequently causing challenges where large carnivores coexist with humans, often due to predation on livestock. In Sweden the brown bear (Ursus arctos) distributional range largely overlaps with the reindeer (Rangifer tarandus tarandus) herding area, but knowledge of potential losses to bear predation has been scarce. Also, little information exists on the behavioral interactions between semi-domesticated reindeer and brown bears in Fennoscandia. In this thesis I present data from two forest reindeer herding districts in Northern Sweden, showing that brown bear predation on reindeer neonates can be considerable on forested calving grounds. Also, brown bear predation was very limited in time, concentrated to the first weeks following birth of the reindeer calves. Moreover, using GPS location data to compare brown bear and reindeer resource selection on the reindeer calving ground, indicated that brown bear behavioral adjustments to search for reindeer possibly dominate over antipredator responses by reindeer in terms of altered resource selection on a daily and seasonal basis. Nevertheless, a closer investigation of the spatial distributions of reindeer calf kill sites suggested that use of clear-cuts, higher elevations and areas closer to large roads may reduce risk of bear predation. However, even though clear-cuts may provide advantages for survival in the short term, logging may eventually yield negative effects for the reindeer, as abundance of young forest increase, which is a preferred habitat by brown bears. Finally, using data on reindeer movements and brown bear density from seven herding districts in Sweden I show that reindeer females experiencing higher risk of bear predation, deviate more from optimal foraging and increase movement rates, which may lead to lower body condition and, in turn, possible consequences for population dynamics.

Authors/Creators:Sivertsen, Therese Ramberg
Title:Risk of brown bear predation on semi-domesticated reindeer calves
Subtitle:predation patterns, brown bear – reindeer interactions and landscape heterogeneity
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2017
Depositing date:9 May 2017
Number of Pages:50
IStøen O-G, Sivertsen TR, Rauset GR, Kindberg, J, Bischop, R, Skarin A, Segerström P and Frank J. Brown bear predation on neonatal semidomestic reindeer: patterns and possible mitigations (manuscript)
IISivertsen TR*, Åhman B, Steyaert SMJG, Rönnegård L, Frank J, Segerström P, Støen O-G and Skarin A. (2016) Reindeer habitat selection under the risk of brown bear predation during calving season. Ecosphere 7(11): e01583
IIISivertsen TR, Skarin A, Rönnegård L, Åhman B, Frank J, Segerström P and Støen O-G. Brown bear predation on semi-domesticated reindeer calves: relating kill locations to landscape heterogeneity (manuscript)
IVRivrud IM**, Sivertsen TR**, Mysterud A, Åhman B, Støen O-G and Skarin A. Reindeer green-wave surfing constrained by predators (manuscript)
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8873-6
ISBN for electronic version:978-91-576-8874-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L01 Animal husbandry
L Animal production > L20 Animal ecology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Behavioural Sciences Biology
Agrovoc terms:reindeer, ursidae, predation, landscape, habitates, animal behaviour
Keywords:Rangifer, brown bear, predation, landscape characteristics, habitat selection, antipredator behavior, green wave
Permanent URL:
ID Code:14291
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: Ms Therese Ramberg Sivertsen
Deposited On:11 May 2017 11:43
Metadata Last Modified:09 Sep 2020 14:17

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