Blar i Institutt for natur, helse og miljø på emneord "Beavers"
Viser treff 1-20 av 43
-
A gross assessment of the suitability of selected Scottish riparian habitats for beaver
(Journal article; Peer reviewed, 2000)In November 1998 we were shown a selection of riparian habitats in Scotland and asked to assess their suitability for beaver based on our experience in working with beaver elsewhere. Though many examples of good beaver ... -
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 ... -
Beaver management in Norway : a model for continental Europe?
(Journal article; Peer reviewed, 2003)While Norway has been managing beaver (Castor fiber) for more than 150 years, most central European countries have little experience and none are presently harvesting beaver, despite rapidly growing populations and conflicts. ... -
Cadmium, copper, and zinc in Eurasian beaver (Castor fiber) from Bø, Telemark, Norway
(Journal article; Peer reviewed, 2001)Heavy metals are elements present in all forms of life. Of those analysed for in the present study, cadmium (Cd) is toxic and non-essential while copper (Cu) and zinc (Zn) are essential elements, but toxic when certain ... -
Can beaver Castor fiber be selectively harvested by sex and age during spring hunting?
(Conference report, 2000)In Norway, Sweden and Finland hunting Eurasian beaver Castor fiber Linnaeus, 1758 with firearms is presently the main harvest form and most are shot in late April and early May. As beaver cannot be sexed from external ... -
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. -
Comeback of the beaver Castor fiber : an overview of old and new conservation problems
(Journal article; Peer reviewed, 1998)Due to over-hunting c. 1200 Eurasian previous termbeaversnext term Castor fiber survived in eight relict populations in Europe and Asia at the beginning of the 20th century. Following hunting restrictions and translocation ... -
Current distribution, status and patterns of spread of the Eurasian beaver Castor fiber, and the implications for management
(Conference report, 2000)Reduced to 1200 animals in 8 small refugia by the end of the 19th century, natural spread and reintroductions have led to a powerful recovery in Eurasian beaver (Castor fiber L. 1758) range and populations. The minimum ... -
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, ... -
Ecological impact of beavers Castor fiber and Castor canadensis and their ability to modify ecosystems
(Journal article; Peer reviewed, 2005)The genus Castor comprises two species: the Eurasian beaver Castor fiber, and the North American beaver Castor canadensis. Both species suffered from overexploitation, but have seen a revival since the 1920s due to increased ... -
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway
(Journal article; Peer reviewed, 2002)In Norway, Sweden and Finland moose Alces alces hunting teams are often employed to survey occupied beaver (Castor fiber and C. canadensis) lodges while hunting. Results may be used to estimate population density or trend, ... -
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 ... -
Field anaesthetic and surgical techniques for implantation of intraperitoneal radio transmitters in Eurasian beavers Castor fiber
(Journal article; Peer reviewed, 2004)Radio transmitters were implanted intraperitoneally in 22 (nine females, 13 males) adult, territorial Eurasian beavers Castor fiber under field conditions. Two different injectable anaesthestic drug combinations were tested. ... -
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 ... -
Harvesting of males delays female breeding in a socially monogamous mammal : the beaver
(Journal article; Peer reviewed, 2007)Human exploitation may skew adult sex ratios in vertebrate populations to the extent that males become limiting for normal reproduction. In polygynous ungulates, females delay breeding in heavily harvested populations, but ... -
Investigations of waterborne pathogens in Eurasian beaver (Castor fiber) from Telemark county, Southeast Norway
(Journal article; Peer reviewed, 2001)The presence of pathogenic bacteria and parasites in drinking water is a well-known cause of human disease outbreaks. There is however, a lack of knowledge of the contamination routes to water. In Norway, the supply of ... -
Landscape use and economic value of Eurasian beaver (Castor fiber) on large forest in southeast Norway
(Conference report, 1999)Though numerous studies of damage caused by beaver (Castor canadensis and C. fiber) to commercially managed forests have been conducted, few have incorporated the economic advantages beaver can create for forest owners. ... -
Methods for live-trapping beaver (Castor spp.)
(Journal article; Peer reviewed, 1998)Effective live-trapping of beaver (Castor spp.) has been and will continue to be necessary for introductions, re-introductions, translocation for the preservation of populations, removal of nuisance beaver, and to obtain ...