Blar i Institutt for natur, helse og miljø på utgivelsesdato
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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 ... -
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 ... -
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 ... -
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 ... -
Methods of aquatic and terrestrial netting to capture Eurasian beavers
(Journal article; Peer reviewed, 2001)Effective live-trapping of beavers (Castor spp.) has been and will continue to be necessary for introductions, re-introductions, translocation, or to obtain animals for breeding and zoological gardens. Here we describe a ... -
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 ... -
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 ... -
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 ... -
Koppermangel hos oppdrettshjort
(Journal article; Peer reviewed, 2001)Raising red deer in enclosures for meat production is a relatively new practice in Norway and is based on national stocks (Cervus elaphus atlanticus). Presently only 400 - 500 hinds are reared in enclosures by 25 ... -
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 ... -
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, ... -
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 ... -
Petrifilm TM som alternativt medium for dyrking av bakterier i vann
(Journal article, 2002)Metoden NS-EN ISO 6222 er sammenlignet med Petrifilm for påvisning og telling av mikroorganismer i overflatevann (råvann) og i drikkevann (behandlet vann). De dyrkingstemperaturene som gjeldende drikkevannsforskrift angir ... -
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 ... -
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, ... -
Sex and age composition of spring-hunted Eurasian beaver in Norway
(Journal article; Peer reviewed, 2002)In Norway, Sweden and Finland most Eurasian beaver (Castor fiber) harvested are shot in April and May. As beaver cannot be sexed or effectively aged under spring hunting conditions, hunters normally shoot the first animal ... -
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. ... -
Superoxide dismutase polymorphisms in wild populations of herb Paris (Paris quadrifolia L., Trilliaceae)
(Journal article, 2003)Polymorphism of superoxide dismutase (SOD) was investigated in leaves of herb Paris (Paris quadrifolia L., Trilliaceae). The plants were collected during the summer and autumn of 2001 from different natural locations in ... -
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 ... -
The growth and phenology patterns of herb Paris (Paris quadrifolia L., Trilliaceae): relation to soil and air temperatures
(Journal article; Peer reviewed, 2003)The phenology and development of Paris quadrifolia L. has been related to variations in soil and air temperatures during four seasons (1997-2000). Its emergence appeared to be strongly dependant on soil temperature. Plants ...