English
norskBlar i forfatter "Bårdsen, Bård-Jørgen"
Viser treff 1-15 av 15
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Beregning av produksjon og tap i reindriften
(Research report; Forskningsrapport, 2013-05)En økning i rovdyrbestandene i reinbeiteområdene regnes av næringen som den viktigste enkeltfaktoren som forårsaker lav kalvetilgang, store tap av dyr og derigjennom lav produksjon i tamreinflokkene i Norge. Endringer i reintall og klimatiske forhold er imidlertid også viktige faktorer som påvirker reproduksjon og overlevelse hos rein. Gitt at predasjon har stor innvirkning på reinens demografi ... -
Community-wide mesocarnivore response to partial ungulate migration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
The impact of climate sensitive factors on the exposure to organohalogenated contaminants in an aquatic bird exploiting both marine and freshwater habitats
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-27)To assess how climate-sensitive factors may affect the exposure to organochlorines (OCs) and perfluoroalkyl substances (PFASs), we monitored concentrations in eggs of the common goldeneye (<i>Bucephala clangula</i>) over two decades (1999–2019) in central Norway. The goldeneye alternates between marine and freshwater habitats and is sensitive to climate variation, especially due to alterations in ... -
Impacts of a warming climate on concentrations of organochlorines in a fasting high arctic marine bird: Direct vs. indirect effects?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-30)The present study examined how climate changes may impact the concentrations of lipophilic organochlorines (OCs) in the blood of fasting High Arctic common eiders (Somateria mollissima) during incubation. Polychlorinated biphenyls (PCBs), 1-dichloro-2,2-bis (p-chlorophenyl) ethylene (p,p′-DDE), hexachlorobenzene (HCB) and four chlordane compounds (oxychlordane, trans-chlordane and trans- and ... -
Long-term monitoring of exposure to toxic and essential metals and metalloids in the tawny owl (Strix aluco): Temporal trends and influence of spatial patterns
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-10)As a result of regulatory decisions, atmospheric deposition of most toxic metals and metalloids (MEs) has decreased in Europe over the past few decades. However, little is known about how this reduction translates into exposure at higher trophic levels in the terrestrial environment where temporal trends may be spatially heterogeneous due to local current or legacy sources of emissions (e.g., industry) ... -
A novel use of the leukocyte coping capacity assay to assess the immunomodulatory effects of organohalogenated contaminants in avian wildlife
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-19)Apex predators are characterized by high levels of biomagnifying organohalogenated contaminants (OHCs) which have been found to induce detrimental health effects in wildlife, such as immune system impairment. The leukocyte coping capacity (LCC) assay is a functional real-time measure of an innate immune response essential in pathogen resistance, known as the respiratory burst. The current study ... -
A novel use of the leukocyte coping capacity assay to assess the immunomodulatory effects of organohalogenated contaminants in avian wildlife
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05)Apex predators are characterized by high levels of biomagnifying organohalogenated contaminants (OHCs) which have been found to induce detrimental health effects in wildlife, such as immune system impairment. The leukocyte coping capacity (LCC) assay is a functional real-time measure of an innate immune response essential in pathogen resistance, known as the respiratory burst. The current study ... -
Pastoral herding strategies and governmental management objectives: predation compensation as a risk buffering strategy in the Saami reindeer husbandry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011-05-12)Previously it has been found that an important risk buffering strategy in the Saami reindeer husbandry in Norway is the accumulation of large herds of reindeer as this increases long-term household viability. Nevertheless, few studies have investigated how official policies, such as economic compensation for livestock losses, can influence pastoral strategies. This study investigated the effect of ... -
Plastic reproductive allocation as a buffer against environmental stochasticity : linking life history and population dynamics to climate
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011)Empirical work suggest that long-lived organisms have adopted risk sensitive reproductive strategies where individuals trade the amount of resources spent on reproduction versus survival according to expected future environmental conditions. Earlier studies also suggest that climate affects population dynamics both directly by affecting population vital rates and indirectly through long-term changes ... -
Resemblance Reporting on Children: Sisters Are More Proactive than Brothers
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-02)The asymmetric grandparental investment in humans may ultimately be explained by the paternity uncertainty hypothesis. The proximate mechanisms leading to grandparental bias in investment in grandchildren are, however, unclear. In a study of 233 males and females with an opposite sexed sibling, we examined whether comments on resemblance regarding one’s own child, or one’s sibling’s child, ... -
Risk sensitive reproductive strategies : the effect of environmental unpredictability
(Doctoral thesis; Doktorgradsavhandling, 2009-02-13)A crucial task in ecology is to quantify trade offs between competing demographic processes for experienced by individuals that inhabit unpredictable environments. Perhaps the most widely studied trade off is that between current reproduction and future survival (‘the cost of reproduction’). While experimental studies have been widely used to quantify life history strategies in birds, virtually ... -
The status and trends of seabirds breeding in Norway and Svalbard
(Research report; Forskningsrapport, 2015-03)This report presents the updated sizes, trends and spatial distributions of the breeding populations of 17 seabird species breeding in Norway and Svalbard. The analyses are based on available census and monitoring data from SEAPOP; the Norwegian monitoring and mapping program for seabirds. In addition, the report presents results from a species-specific literature review of the most important ... -
Telomere length in relation to persistent organic pollutant exposure in white-tailed eagle (Haliaeetus albicilla) nestlings from Sweden sampled in 1995-2013
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-10)Telomeres are used as biomarkers of vertebrate health because of the link between their length, lifespan, and survival. Exposure to environmental stressors appears to alter telomere dynamics, but little is known about telomere length and persistent organic pollutant (POP) exposure in wildlife. The white-tailed eagle (WTE; Haliaeetus albicilla) is an avian top predator that accumulates high levels ... -
Temporal Trends of Organochlorine and Perfluorinated Contaminants in a Terrestrial Raptor in Northern Europe Over 34 years (1986–2019)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-21)Fourteen legacy organochlorine (OC) contaminants and 12 perfluoroalkyl substances (PFASs) were measured in eggs of tawny owls (Strix alueco) in central Norway (1986–2019). We expected OCs to have reached stable equilibrium levels due to bans, and that recent phase-out of some PFASs would have slowed the increase of these compounds. ∑OC comprised on average approximately 92% of the measured compounds, ... -
Velferdskriterier i reindriften
(Research report; Forskningsrapport, 2017-06-07)Formålet med prosjektet var å identifisere ulike faktorer som kunne påvirke velferd hos tamrein, og som kunne implementeres i produksjonssystemene, på beite, i gjerdet, på slakteriet, gjennom produktmerking og fremtidige kvalitetssikringssystemer. I den senere tid har det vært et økt fokus på dyrehelse og -velferd i reindrifta. Det har for eksempel vært et fokus på lave slaktevekter, spesielt i ...
