Søk
Viser treff 1-3 av 3
How spatial variation in areal extent and configuration of labile vegetation states affect the riparian bird community in Arctic Tundra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
The Arctic tundra is currently experiencing an unprecedented combination of climate change, change in grazing pressure by large herbivores and growing human activity. Thickets of tall shrubs represent a conspicuous vegetation state in northern and temperate ecosystems, where it serves important ecological functions, including habitat for wildlife. Thickets are however labile, as tall shrubs respond ...
Shedding new light on the diet of Norwegian lemmings: DNA metabarcoding of stomach content
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
Lemmings are key herbivores in many arctic food webs, and their population dynamics have major impacts on the functioning of tundra systems. However, current knowledge of lemming diet is limited, hampering evaluation of lemming–vegetation interactions. This lack of knowledge is mainly due to methodological challenges, as previously used microhistological methods result in large proportions of poorly ...
Indirect food web interactions mediated by rodent cycles: Relative roles of lemmings and voles
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-12-23)
Production cycles in birds are proposed as prime cases of indirect interactions
in food webs. They are thought to be driven by predators switching from
rodents to bird nests in the crash phase of rodent population cycles. Although
rodent cycles are geographically widespread and found in different rodent
taxa, bird production cycles appear to be most profound in the high Arctic
where lemmings ...