scholarly journals Multisource noninvasive genetics of brown bears ( Ursus arctos ) in Greece reveals a highly structured population and a new matrilineal contact zone in southern Europe

2021 ◽  
Author(s):  
Charilaos Pylidis ◽  
Peeter Anijalg ◽  
Urmas Saarma ◽  
Deborah A. Dawson ◽  
Nikoleta Karaiskou ◽  
...  
Keyword(s):  
Contact Zone ◽  
Ursus Arctos ◽  
Southern Europe ◽  
Brown Bears ◽  
Structured Population ◽  
Noninvasive Genetics

Litter size and basic diet of brown bears (Ursus arctos, Carnivora) in northeastern Turkey

Mammalia ◽  
2016 ◽  
Vol 80 (2) ◽  
Author(s):  
Hüseyin Ambarlı
Keyword(s):  
Litter Size ◽  
Ursus Arctos ◽  
Brown Bears ◽  
Basic Diet

AbstractBrown bears (

Molecular identification of Taenia spp. in wolves (Canis lupus), brown bears (Ursus arctos) and cervids from North Europe and Alaska

2011 ◽  
Vol 60 (3) ◽  
pp. 289-295 ◽  
Author(s):  
Antti Lavikainen ◽  
Sauli Laaksonen ◽  
Kimberlee Beckmen ◽  
Antti Oksanen ◽  
Marja Isomursu ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Canis Lupus ◽  
Ursus Arctos ◽  
Brown Bears

scholarly journals Long-Term Safety of Intraperitoneal Radio Transmitter Implants in Brown Bears (Ursus arctos)

2018 ◽  
Vol 5 ◽  
Author(s):  
Jon M. Arnemo ◽  
Bjørnar Ytrehus ◽  
Knut Madslien ◽  
Jonas Malmsten ◽  
Sven Brunberg ◽  
...  
Keyword(s):  
Ursus Arctos ◽  
Brown Bears ◽  
Radio Transmitter

Sexing free-ranging brown bears Ursus arctos using hairs found in the field

1993 ◽  
Vol 2 (6) ◽  
pp. 399-403 ◽  
Author(s):  
P. TABERLET ◽  
H. MATTOCK ◽  
C. DUBOIS-PAGANON ◽  
J. BOUVET
Keyword(s):  
Ursus Arctos ◽  
Brown Bears ◽  
Free Ranging

scholarly journals Changes in Sexual Behavior and Fecal Steroid Hormone Concentrations during the Breeding Season in Female Hokkaido Brown Bears (Ursus arctos yesoensis) under Captive Condition

2003 ◽  
Vol 65 (1) ◽  
pp. 99-102 ◽  
Author(s):  
Akiko ISHIKAWA ◽  
Hideyuki SAKAMOTO ◽  
Seiji KATAGIRI ◽  
Yoshiyuki TAKAHASHI
Keyword(s):  
Sexual Behavior ◽  
Breeding Season ◽  
Ursus Arctos ◽  
Steroid Hormone ◽  
Brown Bears ◽  
Fecal Steroid ◽  
Captive Condition

Serologic Evidence of Leptospira spp. Serovars in Brown Bears (Ursus arctos) from Croatia

2010 ◽  
Vol 46 (1) ◽  
pp. 251-256 ◽  
Author(s):  
Alen Slavica ◽  
Dean Konjević ◽  
Đuro Huber ◽  
Zoran Milas ◽  
Nenad Turk ◽  
...  
Keyword(s):  
Ursus Arctos ◽  
Brown Bears ◽  
Leptospira Spp ◽  
Serologic Evidence

scholarly journals The smell of success: Reproductive success related to rub behavior in brown bears

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247964
Author(s):  
Andrea T. Morehouse ◽  
Anne E. Loosen ◽  
Tabitha A. Graves ◽  
Mark S. Boyce
Keyword(s):  
Reproductive Success ◽  
Ursus Arctos ◽  
Scent Marking ◽  
Brown Bear ◽  
Parentage Analysis ◽  
Fitness Component ◽  
Brown Bears ◽  
Male And Female ◽  
Rubbing Behavior ◽  
Insight Into

Several species of bears are known to rub deliberately against trees and other objects, but little is known about why bears rub. Patterns in rubbing behavior of male and female brown bears (Ursus arctos) suggest that scent marking via rubbing functions to communicate among potential mates or competitors. Using DNA from bear hairs collected from rub objects in southwestern Alberta from 2011–2014 and existing DNA datasets from Montana and southeastern British Columbia, we determined sex and individual identity of each bear detected. Using these data, we completed a parentage analysis. From the parentage analysis and detection data, we determined the number of offspring, mates, unique rub objects where an individual was detected, and sampling occasions during which an individual was detected for each brown bear identified through our sampling methods. Using a Poisson regression, we found a positive relationship between bear rubbing behavior and reproductive success; both male and female bears with a greater number of mates and a greater number of offspring were detected at more rub objects and during more occasions. Our results suggest a fitness component to bear rubbing, indicate that rubbing is adaptive, and provide insight into a poorly understood behaviour.

scholarly journals Specific shifts in the endocannabinoid system in hibernating brown bears

2020 ◽  
Author(s):  
Christian Boyer ◽  
Laura Cussonneau ◽  
Charlotte Brun ◽  
Christiane Deval ◽  
Jean-Paul Pais de Barros ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Ursus Arctos ◽  
Mild Hypothermia ◽  
Endocannabinoid System ◽  
Fold Increase ◽  
Physiological Adaptation ◽  
Acid Oxidation ◽  
Brown Bears ◽  
Peripheral Tissues ◽  
Free Ranging

Abstract In small hibernators, global downregulation of the endocannabinoid system (ECS), which is involved in modulating neuronal signaling, feeding behavior, energy metabolism, and circannual rhythms, has been reported to possibly drive physiological adaptation to the hibernating state. We hypothesized that specific changes should occur in hibernating brown bears ( Ursus arctos ) due to specific features, including hibernation during half the year at only mild hypothermia while remaining physically inactive without drinking or eating, and the absence of arousal episodes although bears remain sensitive to external disturbances. We explored circulating lipids and the ECS in plasma and metabolically active tissues (muscle and adipose tissue), in free-ranging subadult Scandinavian brown bears when both active and hibernating. In winter bear serum, in addition to a 2-fold increase in total fatty acid concentration, we found significant changes in relative proportions of circulating fatty acids, such as a 2-fold increase in docosahexaenoic acid and a decrease in arachidonic acid. In adipose and muscle tissues of hibernating bears, we found lower concentrations of both two major ligands for endocannabinoid receptors, 2-arachidonoylglycerol (2-AG) and anandamide (AEA). Gene expression was reduced for enzymes that synthesize endocannabinoid compounds, whereas an increase was observed for catabolic enzymes. Reduction in ECS tone may promote mobilization of fat stores and favor carbohydrate metabolism in skeletal muscle of hibernating bears. Additionally, high circulating of the endocannabinoid-like compound N-oleoylethanolamide (OEA) in winter could favor lipolysis and fatty acid oxidation in peripheral tissues. We also speculated on a role of OEA in the maintenance of torpor (reduction in locomotion), while promoting the capacity of bears to sense stimuli from the environment.

scholarly journals Do brown bears Ursus arctos avoid barbed wires deployed to obtain hair samples? A videographic assessment

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Katherine Wold ◽  
Aaron J. Wirsing ◽  
Thomas P. Quinn
Keyword(s):  
Ursus Arctos ◽  
Brown Bears ◽  
Hair Samples

scholarly journals Studies on Reproductive Physiology of Hokkaido Brown Bears, Ursus arctos yesoensis

1990 ◽  
Vol 36 (5) ◽  
pp. 1P-10P
Author(s):  
Toshio TSUBOTA
Keyword(s):  
Ursus Arctos ◽  
Reproductive Physiology ◽  
Brown Bears
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