Sökning: "Göran Englund"
Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Göran Englund.
1. Competition in caddis larvae
Sammanfattning : This thesis deals with behavioural strategies used by caddis larvae in pairwise contests and when selecting microhabitats. Effects of caddis larvae on survival and habitat selection of other insect taxa have also been studied. LÄS MER
2. Anthropogenic 129I Traced in Environmental Archives by Accelerator Mass Spectrometry
Sammanfattning : Since the beginning of the nuclear era, starting during the 1940s, large amount of radioactivity has been released into the environment. This thesis deals with the temporal and spatial distribution of the anthropogenic radioisotope 129I (T1/2= 15.7 Myr) in northern Europe. LÄS MER
3. Spatial heterogeneity and biotic interactions : scaling from experiments to natural systems
Sammanfattning : Much of current ecological theory stems from experimental studies. These studies have often been conducted in closed systems, at spatial scales that are much smaller than the systems of interest. LÄS MER
4. Fågel, fisk eller förundran? : En studie av förhållningssätt i existentiella frågor, baserad på uppsatser skrivna på ett mångkulturellt vuxengymnasium
Sammanfattning : Fågel, fisk eller förundran? A study of existential attitudes based on essays written in a multicultural upper secondary school for adults The aim of this study is to survey and interpret outlooks on life as expressed in 175 essays written (1999-2001) in a multicultural Swedish suburb by adult students learning Swedish, Swedish as a Foreign Language, and Philosophy. What are the recurring themes in these essays? How do they reflect the fundamental existential problems of their authors? The theoretical background rests on existential hermeneutics with Sartre (1943, 1946, 1984) as the most important philosophical source. LÄS MER
5. Biotic resistance in freshwater fish communities
Sammanfattning : Invasions of non-native species cause problems in ecosystems worldwide, and despite the extensive effort that has been put into research about invasions, we still lack a good understanding for why some, but not other, communities resist these invasions. In this doctoral thesis I test hypotheses on biotic resistance using a large dataset of more than 1000 both failed and successful introductions of freshwater fish into Swedish lakes. LÄS MER