Institutt for natur, helse og miljø: Nye registreringer
Viser treff 281-300 av 321
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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 ... -
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 ... -
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. -
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 ... -
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. ... -
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, ... -
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 ... -
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 ... -
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 ... -
Similarity of Campylobacter lari among human, animal, and water isolates in Norway
(Journal article; Peer reviewed, 2008)A total of 49 isolates of Campylobacter lari from human, poultry, ducks, pigs, and water were genetically characterized. The species were identified by biotyping and multiplex polymerase chain reaction (PCR). Automatic ... -
Ribotype diversity of Listeria monocytogenes isolates from two salmon processing plants in Norway
(Journal article; Peer reviewed, 2006)The purpose of this study was to use automated ribotyping procedure to track Listeria monocytogenes transmission in the cold smoked fish production chain and to characterize L. monocytogenes subtypes associated with 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 ... -
Increased mRNA expression levels of ERCC1, OGG1 and RAI in colorectal adenomas and carcinomas
(Journal article; Peer reviewed, 2006-08-16)BACKGROUND: The majority of colorectal cancer (CRC) cases develop through the adenoma-carcinoma pathway. If an increase in DNA repair expression is detected in both early adenomas and carcinomas it may indicate that low ... -
Polymorphisms of the XRCC1, XRCC3 and XPD genes and risk of colorectal adenoma and carcinoma, in a Norwegian cohort: a case control study
(Journal article; Peer reviewed, 2006-03-16)BACKGROUND: Genetic polymorphisms in DNA repair genes may influence individual variation in DNA repair capacity, which may be associated with risk of developing cancer. For colorectal cancer the importance of mutations in ... -
GPX Pro198Leu and OGG1 Ser326Cys polymorphisms and risk of development of colorectal adenomas and colorectal cancer
(Journal article; Peer reviewed, 2005)Little is known about genetic risk factors for colorectal cancer. We assessed the association between polymorphisms in two genes involved in DNA repair of oxidative stress, GPX and OGG1, and risk of colorectal carcinoma ... -
The ratio of Matriptase/HAI-1 mRNA is higher in colorectal cancer adenomas and carcinomas than corresponding tissue from control individuals
(Journal article; Peer reviewed, 2006-07-04)BACKGROUND: It has recently been shown that overexpression of the serine protease, matriptase, in transgenic mice causes a dramatically increased frequency of carcinoma formation. Overexpression of HAI-1 and matriptase ... -
Use of anal gland secretion to distinguish the two beaver species Castor canadensis and C. fiber
(Journal article; Peer reviewed, 1999)Introduced North American beavers Castor canadensis pose a potential threat to the continuing recovery of Eurasian beaver C. fiber populations in several European countries. For management purposes, it is necessary to be ... -
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 ) ... -
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 ... -
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 ...