Blar i Institutt for natur, helse og miljø på emneord "485"
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A test of the dear enemy phenomenon in the Eurasian beaver
(Journal article; Peer reviewed, 2002)We tested the hypothesis that Eurasian beavers, Castor fiber, display the dear enemy phenomenon; that is, they respond less aggressively to intrusions by their territorial neighbours than intrusions by nonterritorial ... -
Collapsing burrow causes death of a Eurasian beaver, Castor fiber
(Journal article; Peer reviewed, 2004)The death of a Eurasian Beaver Castor fiber caused by a collapsing burrow in southeast Norway is reported. Two days of heavy rainfall had presumably caused the burrow to collapse, suffocating the animal. -
Do Eurasian beavers smear their pelage with castoreum and anal gland secretion
(Journal article; Peer reviewed, 2002)The scent-matching hypothesis postulates that scent marks provide an olfactory link between a resident owner and his territory, and that this enables intruding animals to recognize the chance of escalated conflicts. However, ... -
Effectiveness of predator odors as gray squirrel repellents
(Journal article; Peer reviewed, 2001)The ability of gray squirrels (Sciurus carolinensis) to discriminate between different predator odors and the use of predator odors to deter gray squirrels from foraging on plants have not been previously investigated. To ... -
Eurasian beavers (Castor fiber) behavioral response to simulated territorial intruders
(Journal article; Peer reviewed, 2000)Eurasian beavers (Castor fiber) live in family groups that defend territories against other conspecifics. Part of this territorial defence involves constructing scent mounds near the stream bank within territories and ... -
European beaver, Castor fiber, pinned by a felled tree
(Journal article; Peer reviewed, 1996)The death of an adult European Beaver (Castor fiber) caused by a felled tree in Southeast Norway is reported. The trunk fell on the beaver's tail pinning it to the ground. -
Factors affecting scent-marking behavior in Eurasian beaver (Castor fiber)
(Journal article; Peer reviewed, 1997)We tested the hypothesis that a main function of territory marking in Eurasian beaver (Castor fiber) is defense of the territory. The results showed that. (1) beaver colonies with close neighbors scent-mark more often than ... -
Free-ranging Eurasian beavers, Castor fiber, deposit anal gland secretion when scent marking
(Journal article; Peer reviewed, 1998)Two adult free-ranging Eurasian Beavers (Castor fiber) were observed depositing anal gland secretion at the border of thei territory byeverting the "cloaca", protruding the anal gland openings and rubbing them against the ... -
Haematological and serum biochemical reference values in free-ranging red deer (Cervus elaphus atlanticus)
(Journal article; Peer reviewed, 2004)Analyses of haematological and biochemical constituents were carried out on the Norwegian subspecies of free-ranging red deer (Cervus elaphus atlanticus). All animals were captured from January to March by using a mixture ... -
Infanticide as a male reproductive strategy has a nutritive risk effect in brown bears
(Journal article; Peer reviewed, 2013-10-02)Behavioural strategies to reduce predation risk can incur costs, which are often referred to as risk effects. A common strategy to avoid predation is spatio-temporal avoidance of predators, in which prey typically trade ... -
Odorant source used in Eurasian beaver territory marking
(Journal article; Peer reviewed, 2001)Mammals use urine, feces, or the secretion of specialized skin glands to mark their territories. These sources can carry different information and, thus, have different functions. Presently it is not known if beavers (Castor ... -
Pine marten, Martes martes, as an Eurasian beaver, Castor fiber, lodge occupant and possible predator
(Journal article; Peer reviewed, 1998)We trapped three adult Eurasian Pine Martens (Martes martes) at an earlier trapped-out Eurasian Beaver (Castor fiber) lodge in southem Norway. At another site, Pine Marten feces containing remains of beaver claws and hair ... -
Potential risks of olfactory signaling : the effect of predators on scent marking by beavers
(Journal article; Peer reviewed, 2006)Mammals scent mark their territories to advertise occupancy and ownership. However, signaling with scent for territorial defense can have a negative effect by advertising an individual’s presence and location to predators. ... -
Red fox, Vulpes vulpes, kills a European beaver, Castor fiber, kit
(Journal article; Peer reviewed, 1996)We observed an adult Red Fox (Vulpes vulpes) attack, kill and partially consume a 2-month-old female kit European Beaver (Castor fiber) near its lodge in Norway. The inner organs were consumed first. One adult beaver ... -
Resident beavers (Castor canadensis) do not discriminate between castoreum scent marks from simulated adult and subadult male intruders
(Journal article; Peer reviewed, 2006)Subadult intruding beavers (Castor spp.) could be expected to pose a higher threat than adults to territory holders because, unlike adults who usually own a territory, subadults need to acquire a territory and a mate to ... -
Responses of foraging Eurasian beavers Castor fiber to predator odours
(Journal article; Peer reviewed, 2000)The ability of Eurasian beavers Castor fiber to recognise different predator odours has received little research, nor has the use of predator odours to deter Eurasian beavers from damaging agricultural crops, fruit and ... -
Scent-marking in the Eurasian beaver (Castor fiber) as a means of territory defense
(Journal article; Peer reviewed, 1998)Beaver (Castor spp.) normally scent mark by depositing castoreum and/or anal gland secretion on scent mounds close to the water's edge. The aim of this study was to investigate the hypothesis that the Eurasian beaver (C. ... -
Selective foraging on woody plant species by the Eurasian beaver (Castor fiber) in Telemark, Norway
(Journal article; Peer reviewed, 2006)Beavers Castor spp. are generalist herbivores, feeding on the bark, shoots and leaves of woody plants, terrestrial herbs and forbs, ferns and aquatic vegetation. As central-place foragers, beavers move out from water to ... -
Sex discrimination via anal gland secretion in a territorial monogamous mammal
(Journal article; Peer reviewed, 2014-07-12)Monogamy in mammals is relatively unusual, only occurring in 3-5% and to an even lesser degree in rodents. Monogamy exists in two forms, facultative which evolved due to female dispersion and obligate when male care is ... -
Sexual dimorphism in territorial scent marking by adult eurasian beavers (Castor fiber)
(Journal article; Peer reviewed, 2006)Mammalian scent marking is often associated with territorial defense. However, males and females may demonstrate different activity patterns and play different roles. Female mammals nurture the young during lactation, while ...