Sökning: "abiotic"
Visar resultat 16 - 20 av 226 avhandlingar innehållade ordet abiotic.
16. Terrestrial Si dynamics in the Arctic: a study on biotic and abiotic controls
Sammanfattning : Silicon is the next most abundant element in the Earth’s crust and its biogeochemical cycle is linked with that of carbon. Further, silicon is a beneficial nutrient for plants in terrestrial ecosystems and a key nutrient for diatoms in aquatic ecosystems. LÄS MER
17. Effects of solar radiation on the abiotic and bacterially mediated carbon flux in aquatic ecosystems
Sammanfattning : In this Thesis, I studied some of the current aspects of organic matter photochemistry. I analyzed abiotic phototransformations of several types of dissolved (DOM) and particulate organic matter (POM). I also evaluated the effects of phototransformation of several types of DOM on bacteria. LÄS MER
18. Ecosystem functioning in streams under pressure : understanding the roles of biotic, abiotic and spatial drivers
Sammanfattning : What will happen if human populations are not able to rely on Earth’s ecosystems to deliver fundamental benefits in a near future? Stream ecosystems provide several essential services to human civilizations, but are currently under threat from multiple anthropogenic pressures. These pressures give rise to stressors that impact biodiversity, ecosystem functioning, and ultimately ecosystem service delivery from streams. LÄS MER
19. Fractionation and Analysis of Chlorinated and Non-Chlorinated Aromatic Compounds in Biotic and Abiotic Environmental Samples
Sammanfattning : .... LÄS MER
20. Effects of abiotic and biotic factors on hatching, emergence and survival in Baltic salmon (Salmo salar L.)
Sammanfattning : This thesis deals with important factors that affect the temporal organization of emergence and early survival of Baltic salmon (Salmo salar L.). The study population was obtained from the Norrfors hatchery (63°50'N,20°05'E), Umeälven (Ume river) in Northern Sweden. LÄS MER