Sökning: "Ecosystem evolution"
Visar resultat 26 - 30 av 50 avhandlingar innehållade orden Ecosystem evolution.
26. Understanding mobile service diffusion as an evolutionary process: A study of the Swedish market
Sammanfattning : This thesis aims to highlight the connections between the diffusion of innovation theory and the evolutionary models for technological changes within the context of mobile communication research. On the basis of empirical findings, the discussion focuses on addressing three research questions: Why should mobile service diffusion be understood as an evolutionary process? How should mobile service diffusion be explained and modelled using evolutionary conceptions? And in what way the evolutionary framework could influence future mobile service diffusion studies?Based on empirical observations and a literature study, this thesis argues that mobile service diffusion involves dynamic, developmental and historical economic process which is comparable to an evolutionary process. LÄS MER
27. The estrogen receptor in fish and effects of synthetic estrogens in the environment - Ecological and evolutionary perspectives and societal awareness
Sammanfattning : Synthetic hormones are a group of pharmaceuticals used for various human and animal treatments. However, consumption and disposal of these substances have also given rise to negative effects and environmental problems for organisms in the wild which is why these substances have been classified as estrogenic endocrine-disrupting chemicals (EDCs). LÄS MER
28. Peatland dynamics in response to past and potential future climate change : A regional modelling approach
Sammanfattning : The majority of the northern peatlands developed during the Holocene as a result of a positive mass balance between net primary productivity (NPP) and heterotrophic decomposition rates. Over that time they have sequestered a huge amount of carbon in terrestrial ecosystems. LÄS MER
29. Solar Activity Changes at the End of the Last Ice Age - Influences on Climate and Applications for Dating
Sammanfattning : Throughout its history Earth experienced a variety of natural climate changes. By investigating their spatial and temporal evolution we can increase the understanding of the mechanisms and dynamics underlying natural climate change and improve our general comprehension of the climate system. LÄS MER
30. Stability and complexity of ecosystems - Global interaction constraints, landscape and extinctions
Sammanfattning : Human society's expansion and demand for both biotic and abiotic natural resources exert a large pressure on ecosystems around the globe. Ecosystems are complex networks of species interacting with each other and their physical surroundings. LÄS MER
