Publications

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fluoride exposure in cervids inhabiting areas adjacent to aluminum smelters in norway. i. residue levels.mandibular fluorine concentrations were determined in 1,425 red deer (cervus elaphus), 240 moose (alces alces), and 424 roe deer (capreolus capreolus) collected in norway from 1990 to 1993 in seven municipalities in which aluminum smelters are located, in eight neighboring municipalities, and in eight reference areas representing background levels. background fluorine concentration was significantly correlated with age in all three species. roe deer had the highest mean background fluorine level ...19968722253
campylobacter spp., salmonella spp., verocytotoxic escherichia coli, and antibiotic resistance in indicator organisms in wild cervids.faecal samples were collected, as part of the national health surveillance program for cervids (hop) in norway, from wild red deer, roe deer, moose and reindeer during ordinary hunting seasons from 2001 to 2003. samples from a total of 618 animals were examined for verocytotoxic e. coli (vtec); 611 animals for salmonella and 324 animals for campylobacter. a total of 50 samples were cultivated from each cervid species in order to isolate the indicator bacterial species e. coli and enterococcus fa ...200516108210
lack of compensatory body growth in a high performance moose alces alces population.considerable work has been done on disentangling important factors determining early development in body size, yet our knowledge of the extent to which animals living under varying conditions can achieve catch-up growth for a bad start in life is limited. here, we investigated how body mass at the age of 8 months influenced adult body mass in a moose alces alces population living under excellent environmental conditions on the island of vega in northern norway. we also investigated if mother age ...200818830632
predicting the potential demographic impact of predators on their prey: a comparative analysis of two carnivore-ungulate systems in scandinavia.1. understanding the role of predation in shaping the dynamics of animal communities is a fundamental issue in ecological research. nevertheless, the complex nature of predator-prey interactions often prevents researchers from modelling them explicitly. 2. by using periodic leslie-usher matrices and a simulation approach together with parameters obtained from long-term field projects, we reconstructed the underlying mechanisms of predator-prey demographic interactions and compared the dynamics o ...201122077484
reproductive success and failure: the role of winter body mass in reproductive allocation in norwegian moose.a life history strategy that favours somatic growth over reproduction is well known for long-lived iteroparous species, especially in unpredictable environments. risk-sensitive female reproductive allocation can be achieved by a reduced reproductive effort at conception, or the subsequent adjustment of investment during gestation or lactation in response to unexpected environmental conditions or resource availability. we investigated the relative importance of reduced investment at conception co ...201323223863
what determines variation in home range size across spatiotemporal scales in a large browsing herbivore?1. most studies of intraspecific variation in home range size have investigated only a single or a few factors and often at one specific scale. however, considering multiple spatial and temporal scales when defining a home range is important as mechanisms that affect variation in home range size may differ depending on the scale under investigation. 2. we aim to quantify the relative effect of various individual, forage and climatic determinants of variation in home range size across multiple sp ...201121388373
the length of growing season and adult sex ratio affect sexual size dimorphism in moose.while factors affecting body growth have been extensively studied, very little is known about the factors likely to affect the sexual size dimorphism (ssd) in polygynous mammals. based on the carcass mass of 24420 male and female moose recorded in 14 norwegian populations, we examine three hypotheses to explain geographical variation in ssd. first, ssd is expected to decrease when the relative density of animals (for a given habitat quality) increases, because resource limitation at high populat ...200616602303
consumption of lead-shot cervid meat and blood lead concentrations in a group of adult norwegians.several recent investigations have reported high concentrations of lead in samples of minced cervid meat. this paper describes findings from a norwegian study performed in 2012 among 147 adults with a wide range of cervid game consumption. the main aim was to assess whether high consumption of lead-shot cervid meat is associated with increased concentration of lead in blood. a second aim was to investigate to what extent factors apart from game consumption explain observed variability in blood l ...201324119336
age, size, and spatiotemporal variation in ovulation patterns of a seasonal breeder, the norwegian moose (alces alces).in seasonal environments, timing of reproduction is an important fitness component. however, in ungulates, our understanding of this biological process is limited. here we analyze how age and body mass affect spatiotemporal variation in timing of ovulation of 6,178 norwegian moose. we introduced a parametric statistical model to obtain inferences about the seasonal timing of ovulation peak, the degree of synchrony among individuals, and the proportion of individuals that ovulate. these component ...200919072136
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