Blar i Institutt for natur, helse og miljø på emneord "Beavers"
Viser treff 21-40 av 43
-
Mitochondrial phylogeography of the Eurasian beaver Castor fiber L.
(Journal article; Peer reviewed, 2005)Nucleotide variation in an approximately 490 bp fragment of the mitochondrial DNA control region (mtDNA CR) was used to describe the genetic variation and phylogeographical pattern in the Eurasian beaver ( Castor fiber ) ... -
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 ... -
Parturition dates for Eurasian beavers Castor fiber: when should spring hunting cease?
(Journal article; Peer reviewed, 2001)Hunting Eurasian beaver Castor fiber with firearms during late spring is the dominating harvest form in Norway but may violate the Norwegian wildlife management principle of not hunting during the breeding season. In ... -
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 ... -
Population and distribution of European beavers (Castor fiber)
(Journal article; Peer reviewed, 2003)After being reduced to about 1,200 animals in eight isolated populations by the beginning of the 20th century, European beavers (Castor fiber) have powerfully recovered in both range and population, through relaxation of ... -
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 ... -
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 ... -
Sexual dimorphism in the development of scent structures for the obligate monogamous Eurasian beaver (Castor fiber)
(Journal article; Peer reviewed, 2004)Scent marking is a common form of territorial demarcation in mammals and differential marking by the sexes may select for differences in scent gland developmental rates or size. Rates of marking reflect level of defense ... -
Simulated winter browsing may lead to induced susceptibility of willows to beavers in spring
(Journal article; Peer reviewed, 2006)Browsing may lead to an induced resistance or susceptibility of the plant to the herbivore. We tested the effect of winter browsing by Eurasian beavers (Castor fiber L., 1758) on food quality of holme willows (Salix ... -
Subspecies discrimination in the Scandinavian beaver (Castor fiber): combining behavioral and chemical evidence
(Journal article; Peer reviewed, 2004)Geographic isolation is one of several models that has been proposed to explain the evolutionary course of speciation. In this study, we examined how geographical isolation may affect subspecies discrimination in the ... -
Territoriality and group sizes in Eurasian beavers (Castor fiber): echoes of settlement and reproduction?
(Journal article; Peer reviewed, 2005)According to current theories of territoriality, an animal is expected to defend the smallest area that can provide resources for maximisation of reproduction, known as the lsquoeconomically defendablersquo area. In group ... -
Territoriality and time budgets in beavers during sequential settlement
(Journal article; Peer reviewed, 1994)Beavers (Castor fiber) were sequentially released into a previously unoccupied area. The settlement of the animals approximated an ideal despotic distribution: they successively settled in rich habitat and then in poor ... -
The beaver's reconquest of Eurasia: status, population development, and management of a conservation success
(Journal article; Peer reviewed, 2002)Overhunting reduced Eurasian Beaver (Castor fiber) populations to c. 1200 animals, in eight isolated populations, around the end of the 19th century. Protection, natural spread and reintroductions led to a powerful recovery ... -
The function of scent marking in beaver (Castor fiber) territorial defence
(Doctoral thesis; Peer reviewed, 2001)This thesis examines how scent marking in Eurasian beaver (Castor fiber) functions in territorial defence. Beavers usually deposit scent (castoreum and/or anal gland secretion (AGS)) onto small piles of mud and debris, and ... -
Tool-use in a display behaviour by Eurasian beavers ( Castor fiber )
(Journal article; Peer reviewed, 2007)Tool use is rare amongst rodents and has never been recorded in connection with agonistic displays. We witnessed a behaviour, stick display (StD), involving tool use in free-living Eurasian beavers (Castor fiber) that we ...