Search for dissertations about: "Ekologi"
Showing result 1 - 5 of 1316 swedish dissertations containing the word Ekologi.
-
1. Predator-prey interactions in freshwater systems: The importance of chemical communication
University dissertation from Kajsa Åbjörnsson, Limnology, Ecology Building, S-223 62 Lund, SwedenAbstract : Predator released chemical cues provide a valuable source of information to prey organisms that can be used to alter their behaviour in order to reduce predation risk. In this thesis, I have examined under what circumstances chemical cues may be used by prey, and if prey discriminate between different cues. READ MORE
-
2. Predators in low arctic tundra and their impact on community structure and dynamics
University dissertation from Umeå : Ekologi och geovetenskapAbstract : The abundance of predators and their impact on ecosystem dynamics is a vividly discussed topic in current ecology. In my studies, incorporating field observations, field experiments and theoretical modeling, I explored the importance of predators and predation in a low arctic tundra ecosystem in northern Norway. READ MORE
-
3. Macroalgae in the Baltic Sea responses to low salinity and nutrient enrichment in Ceramium and Fucus
University dissertation from Umeå : Ekologi och geovetenskapAbstract : The brackish Baltic Sea is a marginal environment for both marine and freshwater species. The rate of ecological differentiation is presumably high due to strong selection pressure from a gradient of decreasing salinity that has been present in its current state for only about 3 000 years. READ MORE
-
4. Vegetation patterns and processes in riparian landscapes
University dissertation from Umeå : Ekologi och geovetenskapAbstract : The objective of this study was to increase understanding of the processes structuring and controlling the species richness of riparian plant communities. In particular, I examined the unimodal relationship, found in many rivers, between plant species richness and location along the river corridor. READ MORE
-
5. Plants go with the flow predicting spatial distribution of plant species in the boreal forest
University dissertation from Umeå : Ekologi och geovetenskapAbstract : The main objectives of this thesis are to study if a topographic wetness index (TWI) could be used as a tool for predicting the spatial distribution of vascular plant species richness in the boreal forest as well as to study congruence in species richness between vascular plants, liverworts, mosses and lichens. A wetness index ln(a/tanβ) based on topography was used to assign a specific TWI-value to every 20 x 20m grid in two 25 km2 boreal forest landscapes (differing in average soil pH) in northern Sweden. READ MORE
