Search Results - "Selås, Vidar"

Radon as a possible link between peak spring tides and lemming cycles by Selås, Vidar

“…There is still no consensus regarding the ultimate cause of the famous 3–4-year population cycles of lemmings. According to the plant stress hypothesis,…”
Get full text

Annual change in forest grouse in southern Norway: variation explained by temperatures, bilberry seed production and the lunar nodal phase cycle by Selås, Vidar

“…Forage quality is rarely the focus of studies on grouse performance. The plant stress hypothesis predicts that the protein digestibility of a focal food plant…”
Get full text

Evidence for different bottom-up mechanisms in wood mouse (Apodemus sylvaticus) and bank vole (Myodes glareolus) population fluctuations in Southern Norway by Selås, Vidar

“…Animals that feed on forest tree seeds, such as Apodemus mice, increase in number after a mast year. At high latitudes, there is a similar delayed response by…”
Get full text

Linking ‘10‐year’ herbivore cycles to the lunisolar oscillation: the cosmic ray hypothesis by SELAS, Vidar

“…The mean population cycle periods of the snowshoe hare Lepus americanus, the larch budmoth Zeiraphera diniana, and the autumnal moth Epirrita autumnata are 9.3…”
Get full text

The lunar nodal phase cycle and winter atmospheric pressure as possible determinants of moth abundance: Analyses of a 30‐year time series from South Norway by Selås, Vidar, Kobro, Sverre

“…According to the plant stress hypothesis, population peaks of herbivores such as moths are caused by plant stress factors that force plants to reallocate…”
Get full text

Seventy-five years of masting and rodent population peaks in Norway: Why do wood mice not follow the rules? by Selas, Vidar

“…Wood mouse (Apodemus sylvaticus) populations are expected to show a peak in autumn in the year after a mast year of sessile oak (Quercus petraea), because…”
Get full text

Timing of population peaks of Norway lemming in relation to atmospheric pressure: A hypothesis to explain the spatial synchrony by Selås, Vidar

“…Herbivore cycles are often synchronized over larger areas than what could be explained by dispersal. In Norway, the 3–4 year lemming cycle usually show no more…”
Get full text

Moth species richness and diversity decline in a 30-year time series in Norway, irrespective of species’ latitudinal range extent and habitat by Burner, Ryan C., Selås, Vidar, Kobro, Sverre, Jacobsen, Rannveig M., Sverdrup-Thygeson, Anne

“…Introduction Insects are reported to be in decline around the globe, but long-term datasets are rare. The causes of these trends are elusive, with changes in…”
Get full text

The paradox of nest reuse: early breeding benefits reproduction, but nest reuse increases nest predation risk by Otterbeck, Andreas, Selås, Vidar, Nielsen, Jan Tøttrup, Roualet, Éric, Lindén, Andreas

“…Many animals build new nests every breeding season instead of saving time by reusing old ones. One hypothesis is that nest reuse leads to increased predation…”
Get full text

Bilberry seed production explains spatiotemporal synchronicity in bank vole population fluctuations in Norway by Selås, Vidar, Framstad, Erik, Rolstad, Jørund, Sonerud, Geir A., Spidsø, Tor K., Wegge, Per

“…Population fluctuations of small rodents are often synchronized over larger areas (>100 km) than what could be explained by dispersal, suggesting that the…”
Get full text

Female turnover rate differs between two Northern Goshawk Accipiter gentilis nesting areas, as revealed by DNA analysis of moulted feathers by Selås, Vidar, Kleven, Oddmund, Steen, Odd Frydenlund

“…The turnover rate of breeding Northern Goshawk Accipiter gentilis females in two study areas in southern Norway, which are assumed to experience different…”
Get full text

Voles and climate in Norway: Is the abundance of herbivorous species inversely related to summer temperature? by Selås, Vidar, Framstad, Erik, Sonerud, Geir A., Wegge, Per, Wiig, Øystein

“…For several mammalian species, both population levels and distribution ranges are predicted to change due to changing habitat conditions caused by climate…”
Get full text

Possible impact of winter conditions and summer temperature on bank vole (Myodes glareolus) population fluctuations in Central Norway by Sørensen, Ole J., Moa, Pål F., Hagen, Bjørn-Roar, Selås, Vidar

“…In recent decades, population fluctuations of microtine rodents have frequently faded out in parts of northern Europe, possibly because of climate change…”
Get full text

Nest reuse by Goshawks after timber harvesting: Importance of distance to logging, remaining mature forest area and tree species composition by SAGA, Øystein, SELAS, Vidar

“…► We studied reuse of 31 Goshawk nests after timber harvesting <50m from the nest. ► Distance to logged area did not differ between nests reused and nests not…”
Get full text

Increased growth and phenolic compounds in bilberry (Vaccinium myrtillus L.) following forest clear-cutting by Nybakken, Line, Selås, Vidar, Ohlson, Mikael

“…Bilberry (Vaccinium myrtillus L.) is a keystone species in boreal forests, but the few studies available concerning influence of forestry on bilberry growth,…”
Get full text

Climatic and seasonal control of annual growth rhythm and flower formation in Vaccinium myrtillus (Ericaceae), and the impact on annual variation in berry production by Selås, Vidar, Sønsteby, Anita, Heide, Ola M., Opstad, Nina

“…Background and aims - Large variation in annual berry production occurs in Vaccinium myrtillus L., and the variation has been associated with population…”
Get full text

Explaining bank vole cycles in southern Norway 1980-2004 from bilberry reports 1932-1977 and climate by SELAS, Vidar

“…Correlations between mast fruiting of bilberry Vaccinium myrtillus and peak levels of Clethrionomys-voles have been reported from both Norway and Finland, but…”
Get full text

Evolution of parental roles in raptors: prey type determines role asymmetry in the Eurasian kestrel by Sonerud, Geir A., Steen, Ronny, Løw, Line M., Røed, Line T., Skar, Kristin, Selås, Vidar, Slagsvold, Tore

“…Raptors deviate from the norm among provisioning birds by having asymmetric parental roles, with the female brooding and feeding offspring, and the male…”
Get full text

Population fluctuations of moths and small rodents in relation to plant reproduction indices in southern Norway by Selås, Vidar, Kobro, Sverre, Sonerud, Geir A

“…Trophic interaction hypotheses for multiannual population fluctuations of herbivores include the predation hypothesis, the induction hypothesis and the plant…”
Get full text

Lichen Compounds Restrain Lichen Feeding by Bank Voles (Myodes glareolus) by Nybakken, Line, Helmersen, Anne-Marit, Gauslaa, Yngvar, Selås, Vidar

“…Some lichen compounds are known to deter feeding by invertebrate herbivores. We attempted to quantify the deterring efficiency of lichen compounds against a…”
Get full text