Search for dissertations about: "Biodiversitet"
Showing result 11 - 15 of 56 swedish dissertations containing the word Biodiversitet.
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11. Using big data to understand evolutionary patterns in Geometridae and Erebidae, the two most diverse families of Lepidoptera
Abstract : Lepidoptera (moths and butterflies) are one of the most diverse groups of organisms on earth. They have conquered all the continents apart from Antarctica. The reasons of such high diversity are still not clear. One of the first steps to study the causes of such evolutionary success is to have a clear idea of their phylogenetic relationships. READ MORE
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12. Flight strategies in migrating birds: when and how to fly
Abstract : Wind has a profound influence on migrating birds since it inevitably will influence travel time and energy expenditure. In this thesis I investigate how migrating birds are affected by, and use winds. READ MORE
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13. Natural enemies: Functional aspects of local management in agricultural landscapes
Abstract : Agricultural intensification has raised the global food production but also caused major concerns about environmental and health effects, including contamination by pesticides. Pesticide applications may induce toxicity not only on the target pest species but especially on non-target species. READ MORE
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14. Evolution and Ecology of AhR genes in Atlantic salmon (Salmo salar L.)
Abstract : In vertebrates, studies of the aryl hydrocarbon receptor (AhR) have been of particular interest due to its direct involvement in the toxic effects exerted by several environmental pollutants, such as PCB and dioxin. After binding to the toxic molecule, this receptor initiates transcription of several genes that are part of the biotransformation battery but most notably the cytochrome P450 (CYP) genes, which results in an excessive release of oxidative enzymes and free radicals. READ MORE
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15. Behaviour under predation risk - antipredator strategies, behavioural syndromes and sex-specific responses in aquatic prey
Abstract : In many natural ecosystems, predation is well recognized as a strong evolutionary force, and predator-mediated selection has been demonstrated to induce changes in prey morphology, life history and behaviour. In my thesis, I have focused on behavioural responses in aquatic prey under the risk of predation. READ MORE