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Visar resultat 1 - 5 av 13 avhandlingar som matchar ovanstående sökkriterier.
1. Life at stake when playing hide and seek : Concealing effects of prey colouration and visual backgrounds
Sammanfattning : A prey animal can use different strategies to avoid becoming eaten by predators. One such widely recognised strategy is the use of body colouration to decrease the risk of becoming detected, i.e. cryptic colouration. LÄS MER
2. Tracing selection and adaptation along an environmental gradient in Populus tremula
Sammanfattning : The distribution of the expressed genotype is moved around in the population over time byevolution. Natural selection is one of the forces that act on the phenotype to change the patterns ofnucleotide variation underlying those distributions. LÄS MER
3. Epiphytic lichen responses to nitrogen deposition
Sammanfattning : Nitrogen (N) deposition has increased globally over the last 150 years and further increase is predicted for the future. Nitrogen is an important nutrient for lichens, involved in many processes in both photobiont and mycobiont. However, N can be a stressor, causing many lichens and lichen communities to disappear with increased deposition. LÄS MER
4. Effects of climate change on boreal wetland and riparian vegetation
Sammanfattning : Models of climate change predict that temperature will increase during the 21th century and the largest warming will take place at high northern latitudes. In addition to warming, predictions for northern Europe include increased annual precipitation and a higher proportion of the precipitation during winter falling as rain instead of snow. LÄS MER
5. Treeline dynamics in short and long term perspectives : observational and historical evidence from the southern Swedish Scandes
Sammanfattning : Against the background of past, recent and future climate change, the present thesis addresses elevational shifts of alpine treelines in the Swedish Scandes. By definition, treeline refers to the elevation (m a.s.l. LÄS MER
