Sökning: "Eva Bergman"
Visar resultat 21 - 25 av 26 avhandlingar innehållade orden Eva Bergman.
21. Landlocked Atlantic salmon Salmo salar L. and trout Salmo trutta L. in the regulated River Klarälven, Sweden : Implications for conservation and management
Sammanfattning : Conservation and management of migratory salmonids requires an understanding of their ecology at multiple scales, and a holistic view, including assessment of historical and present anthropogenic impacts. In the regulated River Klarälven, with 11 hydropower dams, populations of landlocked Atlantic salmon Salmo salar and migratory brown trout Salmo trutta have declined due to human activities. LÄS MER
22. Migration and quality of landlocked Atlantic salmon smolt : Implications for conservation and management
Sammanfattning : Atlantic salmon Salmo salar has a complex life cycle, including long migrations and habitat shifts for both juveniles and adults. As such, salmon populations are vulnerable to habitat degradation and fragmentation along their migratory routes. LÄS MER
23. Staphylococcus aureus bacteremia, molecular epidemiology and host immune response
Sammanfattning : Staphylococcus aureus is a major pathogen responsible for a considerable disease burden worldwide. It may cause a wide array of infections, from superficial skin infections to invasive bacteremia and complications such as infective endocarditis (IE) and osteomyelitis. This thesis aimed to investigate aspects of the molecular epidemiology of S. LÄS MER
24. Salmonid behaviour under winter conditions
Sammanfattning : Winter conditions are believed to play an important role in the population dynamics of northern temperate stream fish, challenging the ability of fish to physiologically and behaviourally adapt. Climate change is predicted to increase both mean temperature and temperature fluctuations, especially during winter, leading to dynamic environmental conditions in terms of river ice production and flow. LÄS MER
25. Winter behaviour of stream salmonids: effects of temperature, light, and ice cover
Sammanfattning : In boreal streams, stream salmonids typically face low water temperatures and variable ice conditions during winter, and thus stream salmonids are expected to use different behavioural strategies to cope with these environmental conditions. The studies presented in this thesis explore how temperature, light intensity, and surface ice affect salmonid behaviour, with focus on drift-feeding and ventilation rates. LÄS MER
