Blar i Institutt for natur, helse og miljø på emneord "488"
Viser treff 1-20 av 27
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A "clearcut" case? Brown bear selection of coarse woody debris and carpenter ants on clearcuts
(Journal article; Peer reviewed, 2015-07-05)Forest management alters habitat characteristics, resulting in various effects among and within species. It is crucial to understand how habitat alteration through forest management (e.g. clearcutting) affects animal ... -
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 ... -
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. ... -
Brown bears possess anal sacs and secretions may code for sex
(Journal article; Peer reviewed, 2010-09-14)Olfactory communication occurs in carnivores and many scent-mark with anal gland secretions (AGS), which contain a variety of information including sex-related cues. Currently, there is disagreement about whether bear ... -
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 ... -
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 ... -
Differences in the vertical distribution pattern of Betula pubescens in Norway and its ecological significance
(Chapter; Peer reviewed, 1996)Several factors influence the altitudinal position of the climatic forest-limit. In addition to variations due to different "forest-limit" definitions, topographic factors are very important. In Western Norway, a range of ... -
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 ... -
Efficacy of cartridge type and projectile design in the harvest of beaver
(Journal article; Peer reviewed, 2006)In Norway, Sweden, and Finland most beavers (Castor spp.) harvested are shot with center-fire rifles. Shooting entails problems not encountered in trapping including pelt damage from bullet holes (body shots are common) ... -
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, ... -
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 ... -
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 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 ... -
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 ) ... -
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 ... -
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 ... -
Population connectivity: dam migration mitigations and contemporary site fidelity in arctic char
(Journal article; Peer reviewed, 2011-07-14)BACKGROUND: Animal feeding and spawning migrations may be limited by physical barriers and behavioral interactions. Dam constructions (e.g. hydropower) commonly include gateways for fish migrations to sustain ecological ... -
Reinsdyrstammen på Hardangervidda for stor
(Journal article, 1981)Hardangervidda, in Southern Norway, is the largest mountain plateau in Europe (Fig. 1). It is approximately 10000 km2 in area and lies mostly between 1100 and 1300 m a.s.l. The topography and vegetational cover produce a ... -
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 ...