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Harmonizing circumpolar monitoring of Arctic fox: benefits, opportunities, challenges and recommendations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-16)
The biodiversity working group of the Arctic Council has developed pan-Arctic biodiversity
monitoring plans to improve our ability to detect, understand and report on long-term
change in Arctic biodiversity. The Arctic fox (Vulpes lagopus) was identified as a target of
future monitoring because of its circumpolar distribution, ecological importance and reliance
on Arctic ecosystems. We provide ...
Homage to Hersteinsson and Macdonald: climate warming and resource subsidies cause red fox range expansion and Arctic fox decline
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-16)
Climate change can have a marked effect on the distribution and abundance of some
species, as well as their interspecific interactions. In 1992, before ecological effects of
anthropogenic climate change had developed into a topical research field, Hersteinsson
and Macdonald published a seminal paper hypothesizing that the northern distribution
limit of the red fox (Vulpes vulpes) is determined ...
Emergent rainy winter warm spells may promote boreal predator expansion into the arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-06)
Climate change has been characterized as the most serious threat to Arctic biodiversity. In addition to gradual changes such as climate warming, extreme weather events, such as melting temperatures in winter and rain on snow, can have profound consequences for ecosystems. Rain-on-snow events lead to the formation of ice layers in the snow pack, which can restrict access to forage plants and cause ...
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 ...
Rough-legged buzzards, arctic foxes and red foxes in a tundra ecosystem without rodents
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02-18)
Small rodents with multi-annual population cycles strongly influence the dynamics of food
webs, and in particular predator-prey interactions, across most of the tundra biome. Rodents
are however absent from some arctic islands, and studies on performance of arctic predators
under such circumstances may be very instructive since rodent cycles have been predicted
to collapse in a warming Arctic. ...
Assessing the causes of breeding failure among the rough-legged buzzard (Buteo lagopus) during the nestling period
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
When food becomes scarce, the youngest nestlings in facultatively siblicidal raptor species typically die and such events are usually attributed to siblicide. Here we present results from an investigation in the Arctic tundra, in which rough-legged buzzard (Buteo lagopus) breeding success was monitored with regular visits to nests and time-lapse cameras that continuously recorded the activity of ...
Intrapopulation variability shaping isotope discrimination and turnover : experimental evidence in Arctic Foxes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
Tissue-specific stable isotope signatures can provide insights into the trophic ecology of consumers and their roles in food webs. Two parameters are central for making valid inferences based on stable isotopes, isotopic discrimination (difference in isotopic ratio between consumer and its diet) and turnover time (renewal process of molecules in a given tissue usually measured when half of the tissue ...
The importance of willow thickets for ptarmigan and hares in shrub tundra : the more the better?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
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)
Nest association between two predators as a behavioral response to the low density of rodents
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-04)
Many birds nest in association with aggressive birds of other species to benefit from their protection against predators. We hypothesized that the protective effect also could extend to foraging resources, whereby the resultant resource-enriched habitats near a nest of aggressive raptors could be an alternative cause of associations between nesting bird species with non-overlapping foraging niches. ...