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Seasonal difference in temporal transferability of an ecological model: near-term predictions of lemming outbreak abundances
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-15)
Ecological models have been criticized for a lack of validation of their temporal transferability. Here we
answer this call by investigating the temporal transferability of a dynamic state-space model developed
to estimate season-dependent biotic and climatic predictors of spatial variability in outbreak abundance
of the Norwegian lemming. Modelled summer and winter dynamics parametrized by spatial ...
Assessing dental wear in reindeer using geometric morphometrical methods.
(Journal article; Peer reviewed; Tidsskriftartikkel, 2006)
Community-wide mesocarnivore response to partial ungulate migration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
Effects of changing permafrost and snow conditions on tundra wildlife: critical places and times
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-21)
The change of water phase around 0 °C has considerable impacts on wildlife ecology because liquid and solid water strongly differ in their insulating capability, mechanical resistance, and light reflectance. Freeze and melt events thus have strong ecological relevance, particularly in the Arctic where snow and ice are omnipresent and their conditions are changing due to climate warming. We first ...
Phenology and cover of plant growth forms predict herbivore habitat selection in a high latitude ecosystem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
The spatial and temporal distribution of forage quality is among the most central factors affecting herbivore habitat
selection. Yet, for high latitude areas, forage quantity has been found to be more important than quality. Studies on large
ungulate foraging patterns are faced with methodological challenges in both assessing animal movements at the scale of
forage distribution, and in assessing ...
Ecosystem drivers of an Arctic fox population at the western fringe of the Eurasian Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-16)
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 the coastal tundra of the Fennoscandian Low Arctic to
be a stronghold for the species. At the start of our research in 2004, however, the local Arctic
fox population was ...
Transferability of biotic interactions: temporal consistency of arctic plant-rodent relationships is poor
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-17)
Variability in biotic interaction strength is an integral part of food web functioning.
However, the consequences of the spatial and temporal variability of biotic interactions
are poorly known, in particular for predicting species abundance and distribution.
The amplitude of rodent population cycles (i.e., peak-phase abundances) has
been hypothesized to be determined by vegetation properties ...
Analysing diet of small herbivores : the efficiency of DNA barcoding coupled with high-throughput pyrosequencing for deciphering the composition of complex plant mixtures
(Journal article; Tidsskriftartikkel; Peer reviewed, 2009-08-20)
Background: In order to understand the role of herbivores in trophic webs, it is essential to know
what they feed on. Diet analysis is, however, a challenge in many small herbivores with a secretive
life style. In this paper, we compare novel (high-throughput pyrosequencing) DNA barcoding
technology for plant mixture with traditional microhistological method. We analysed stomach
contents of two ...
Toward understanding the effect of top predators on ecosystems
(Journal article; Tidsskriftartikkel, 2009)
To what extent top predators - carnivores at the top of food chains - drive or just respond to ecosystem dynamics is a central, but partially unresolved, question in ecology. In this report, we highlight how different research approaches employed in aquatic and terrestrial ecology may have a bearing on how the role of top predators in ecosystems is perceived.
Sources of variation in small rodent trophic niche: New insights from DNA metabarcoding and stable isotope analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-05-15)