Now showing items 21-30 of 63
Fjellrev i Finnmark : årsrapport for 2008
(Research report; Forskningsrapport, 2008)
Fjellrev i Finnmark: Årsrapport 2009
(Research report; Forskningsrapport, 2009)
Fjellrev i Finnmark : forskning og tiltak 2004
(Research report; Forskningsrapport, 2004)
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 ...
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 ...
Breeding persistence of Slavonian Grebe (Podiceps auritus) at long-term monitoring sites: predictors of a steep decline at the northern European range limit
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-10)
The Slavonian Grebe (Podiceps auritus) has its European northern range limit in northern Norway, and is a species of national conservation concern due to its small population size and unknown population trend. Long-term monitoring at the range limit suggests breeding site use is in decline. We used annual occupancy data from 104 breeding lakes monitored since 1991 in northern Norway to investigate ...
Seasonal, oceanographic and atmospheric drivers of diving behaviour in a temperate seal species living in the high arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-07-21)
The harbour seal (Phoca vitulina) population in Svalbard marks the northernmost limit of the species’ range. This small population experiences environmental extremes in sea and air temperatures, sea ice cover and also in light regime for this normally temperate species. This study deployed Conductivity Temperature Depth Satellite Relay Data Loggers (CTDSRDLs) on 30 adult and juvenile harbour ...
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. ...
Haul-out behaviour of the world's northernmost population of harbour seals (Phoca vitulina) throughout the year
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
Future changes in the supply of goods and services from natural ecosystems: prospects for the European north
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09)
Humans depend on services provided by ecosystems, and how services are affected by climate change is increasingly studied. Few studies, however, address changes likely to affect services from seminatural ecosystems. We analyzed ecosystem goods and services in natural and seminatural systems, specifically how they are expected to change as a result of projected climate change during the 21st ...