Browsing Institutt for natur, helse og miljø by Title
Now showing items 282-301 of 321
-
A tale of tails: the use of Eurasian beaver (Castor fiber) tails for ageing and individual identification
(Peer reviewed; Journal article, 2023)With increasing technology and knowledge, the range of methods used to monitor wildlife is growing. As many invasive techniques have been shown to negatively impact study populations, the use of non-invasive methods is ... -
Temperature and Precipitation Development at Svalbard 1900-2100
(Journal article; Peer reviewed, 2011-12-06)Substantial variations in temperature and precipitation have been observed since the first permanent weather station was established in the Svalbard region in 1911. Temperature and precipitation development are analysed ... -
Temporal effects of hunting on foraging behavior of an apex predator: Do bears forego foraging when risk is high?
(Journal article; Peer reviewed, 2016)Avoiding predators most often entails a food cost. For the Scandinavian brown bear (Ursus arctos), the hunting season coincides with the period of hyperphagia. Hunting mortality risk is not uniformly distributed throughout ... -
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 ... -
Territory ownership and familiarity status affect how much male root voles (Microtus oeconomus) invest in territory defence
(Journal article; Peer reviewed, 2008)Neighbour–stranger discrimination occurs when individuals respond with more aggression to strangers than to territorial neighbours—a phenomenon termed the “dear enemy phenomenon” (DEP). We investigated the DEP with male ... -
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 effects of wildfire on the water chemistry of dilute, acidic lakes in southern Norway
(Journal article; Peer reviewed, 2014-01-22)Changes in lake water chemistry were studied for >4 years following a large wildfire in a boreal forest area in Mykland, southern Norway, an area characterized by thin and patchy, base-poor and slow-weathering soils and ... -
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 ... -
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 ... -
The Hardangervidda wild reindeer herd: a problematic management history
(Journal article; Peer reviewed, 2014)The unique and internationally important wild reindeer Rangifer tarandus herd on the Hardangervidda plateau of southern Norway has shown frequent and extreme fluctuations in harvest numbers for the past 60 years, despite ... -
The hydrogeological and cultural background for two sacred springs, Bø, Telemark County, Norway
(Journal article; Peer reviewed, 2015-05-14)Of the many sacred springs in Norway, most dedicated to St. Olav, several have disappeared. Two of the sacred springs that still exist are located in Bø in Telemark, Southern Norway, and have been surveyed for their ... -
The importance of chemical communication studies to mammalian conservation biology: A review
(Journal article; Peer reviewed, 2011-05-14)The relevance of chemical communication to mammalian conservation is not often the focus of scientific investigation. Our review identifies and discusses ten key areas in which the study of chemical communication aids ... -
The influence of a submerged meadow on uptake and trophic transfer of legacy mercury from contaminated sediment in the food web in a brackish Norwegian fjord
(Journal article; Peer reviewed, 2019)There are contradicting results on the importance of legacy mercury (Hg) contaminated sediments to Hg fish tissue concentrations. Still, sediment remediation actions often aim at minimizing ecosystem exposure and human ... -
The influence of permanently submerged macrophytes on sediment mercury distribution, mobility and methylation potential in a brackish Norwegian fjord
(Journal article; Peer reviewed, 2018)Macrophytes are shown to affect the microbial activity in different aqueous environments, with an altering of the sediment cycling of mercury (Hg) as a potential effect. Here, we investigated how a meadow with permanently ... -
The level of claudin-7 is reduced as an early event in colorectal carcinogenesis
(Journal article; Peer reviewed, 2011-02-10)BACKGROUND: Compromised epithelial barriers are found in dysplastic tissue of the gastrointestinal tract. Claudins are transmembrane proteins important for tight junctions. Claudins regulate the paracellular transport and ... -
The PMIP4 contribution to CMIP6 - Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations
(Journal article; Peer reviewed, 2017)Two interglacial epochs are included in the suite of Paleoclimate Modeling Intercomparison Project PMIP4) simulations in the Coupled Model Intercomparison Project (CMIP6). The experimental protocols for simulations of the ... -
The prevalence and distribution of Borrelia burgdorferi sensu lato in host seeking Ixodes ricinus ticks in Lithuania
(Journal article; Peer reviewed, 2006)A total of 1559 unfed Ixodes ricinus (L., 1758) ticks were collected from the vegetation by flagging in 18 locations of Lithuania. The ticks were tested individually for the presence of spirochetes using polymerase chain ... -
The prevalence of Anaplasma phagocytophilum in host-seeking Ixodes ricinus ticks in Norway
(Journal article; Peer reviewed, 2008-12-24) -
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 ...