A5070695206- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Animal Ecology and Behavior Studies
- Ecology and Vegetation Dynamics Studies
- Climate change and permafrost
- Indigenous Studies and Ecology
- Ecology and biodiversity studies
- Plant and animal studies
- Rangeland and Wildlife Management
- Cryospheric studies and observations
- Peatlands and Wetlands Ecology
- Forest Ecology and Biodiversity Studies
- Avian ecology and behavior
- Isotope Analysis in Ecology
- Evolution and Genetic Dynamics
- Mercury impact and mitigation studies
- Environmental DNA in Biodiversity Studies
- Forest Management and Policy
- Geology and Paleoclimatology Research
- Mathematical and Theoretical Epidemiology and Ecology Models
- Toxic Organic Pollutants Impact
- Image Processing and 3D Reconstruction
- Computational Physics and Python Applications
- Climate Change and Health Impacts
- Lichen and fungal ecology
UiT The Arctic University of Norway
2014-2024
Centre for Arctic Gas Hydrate, Environment and Climate
2020
Norwegian Institute for Nature Research
2001-2011
University of Bergen
2006
Summary The development of camera‐traps has provided an opportunity to study ecological relationships and population dynamics species that are rare, difficult observe or capture. Their use seen a major increase recently, particularly with the recent progress in methods adapted for which individuals cannot be identified. We took advantage extensive camera‐trap data sets from large spatiotemporal‐scale studies diverse assemblage avian mammalian scavengers subarctic/arctic tundra determine...
Abstract Ecological models have been criticized for a lack of validation their temporal transferability. Here we answer this call by investigating the transferability dynamic state-space model developed to estimate season-dependent biotic and climatic predictors spatial variability in outbreak abundance Norwegian lemming. Modelled summer winter dynamics parametrized trapping data from one cyclic were validated with subsequent outbreak. There was distinct difference between seasons. Summer...
1. The geographical pattern in Fennoscandian small rodent population dynamics with a southern noncyclic and northern cyclic region, latitudinal gradients density-dependent structure, cycle period length spatial synchrony within the has been widely publicized interpreted ecological literature. However, time-series data on which these inferences have established are relatively short originate from specific time (mostly around 1970-90). Hence, it can be questioned whether patterns consistent...
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 climate affects population dynamics both directly by affecting vital rates and indirectly through long‐term changes in individual life histories. Using a seasonal state‐dependent individual‐based model we investigated how variability...
The distribution of traditional breeding dens on the Varanger Peninsula (70–71°N) in northernmost Fennoscandia indicates that this area once harboured a large Arctic fox population. Early 20th century naturalists regarded coastal tundra Fennoscandian Low to be stronghold for species. At start our research 2004, however, local population was critically small and most neighbouring populations had been extirpated. Here, we synthesize results 11 years highlight ecosystem drivers behind critical...
Summary Mesocarnivores increase in number and geographic range human‐disturbed ecosystems with cascading negative impact on biodiversity. To mitigate such impacts, it is essential to identify the proximate causes of mesocarnivore releases. Here, we assess what extent increased partial migration semi‐domesticated tundra reindeer induce a response boreal arctic mesocarnivores. We used large‐scale multiyear quasi‐experimental study design camera traps deployed coastal peninsulas northern N...
In food webs heavily influenced by multi-annual population fluctuations of key herbivores, predator species may differ in their functional and numerical responses as well competitive ability. Focusing on red arctic fox tundra with cyclic populations rodents prey, we develop a model to predict how dynamics dominant versatile (red fox) impacted long-term growth rate subdominant less (arctic fox). We compare three realistic scenarios performance: (1) response scenario where acted resident...
Environmental variability, through interannual variation in food availability or climatic variables, is usually detrimental to population growth. It can even select for constancy key life-history traits, though some exceptions are known. Changes the level of environmental variability therefore important predict growth evolution. Recently, several cyclic vole and lemming populations have shown large dynamical changes that might affect demography life-histories rodent predators. Skuas...
Abstract Sustainable management of wildlife populations can be aided by building models that both identify current drivers natural dynamics and provide near‐term predictions future states. We employed a Strategic Foresight Protocol (SFP) involving stakeholders to decide the purpose structure dynamic state‐space model for population Willow Ptarmigan, popular game species in Norway. Based on local knowledge stakeholders, it was decided should include food web interactions climatic explanatory...
The areal extent and configuration of thickets willow shrubs are currently changing in the Arctic both as an effect global warming changed browsing pressure reindeer. These changes have been predicted to impact distribution abundance wildlife species relying on habitat. We assessed relation between variables quantifying thicket population dynamics tundra voles (Microtus oeconomus) three riparian regions Finnmark, northern Norway, which were subject intense by semi-domesticated vole, exhibits...
Production cycles in birds are proposed as prime cases of indirect interactions food webs. They thought to be driven by predators switching from rodents bird nests the crash phase rodent population cycles. Although geographically widespread and found different taxa, production appear most profound high Arctic where lemmings dominate. We hypothesized that this may due arctic inducing stronger predator responses than boreal voles. tested hypothesis estimating predation rates dummy during a...
Ptarmigan are herbivorous birds that year-round residents of alpine and arctic ecosystems — presently subjected to the most rapid climate warming on earth. Yet, compared other bird taxa there has been little impact research ptarmigan. population dynamics, in particular sub/low-arctic, appears be strongly influenced by complex interactions with a suite functionally diverse predators food webs. We review evidence supporting strength such predator—ptarmigan altered, likely due change, having...
Different organochlorine compounds (OCs) were measured in the blood of breeding south polar skuas (Catharacta maccormicki) at Svarthamaren, Dronning Maud Land (Antarctica) and compared to those two species northern hemisphere gulls: Arctic glaucous gull (Larus hyperboreus) subarctic great black-backed marinus). The had 8% 29% ∑OC levels (45 ng/g, wet weight) gulls (591 ng/g) (158 ng/g), respectively. Polychlorinated biphenyls (PCBs) p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) very low...