Sökning: "Sticklebacks"
Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet Sticklebacks.
1. The three-spined stickleback, Gasterosteus aculeatus L., in ecotoxicological test systems
Sammanfattning : .... LÄS MER
2. Genetic response to pollution in sticklebacks; natural selection in the wild
Sammanfattning : The last century, humans have been altering almost all natural environments at an accelerating rate, including the Baltic Sea that has highly eutrophicated areas and many coastal industries such as Pulp-mills. For animals living in a habitat that changes there are basically two alternatives, either to cope with the change or become locally extinct. LÄS MER
3. Invasion of top and intermediate consumers in a size structured fish community
Sammanfattning : In this thesis I have investigated the effects of invading top and intermediate consumers in a size-structured fish community, using a combination of field studies, a lake invasion experiment and smaller scale pond and aquaria experiments. The lake invasion experiment was based on introductions of an intermediate consumer, ninespine stickleback (Pungitius pungitius L. LÄS MER
4. Evaluation of Biomarker Responses in Fish : with Special Emphasis on Gill EROD Activity
Sammanfattning : Many chemicals present in the aquatic environment can interfere with physiological functions in fish. Exposure to chemicals can be revealed by the use of biomarkers. Induction of 7-ethoxyresorufin O-deethylase (EROD) activity is a commonly used biomarker for exposure to CYP1A inducers such as dioxins and polyaromatic hyrdrocarbons. LÄS MER
5. Effects of temperature and terrestrial carbon on fish growth and pelagic food web efficiency
Sammanfattning : Both temperature and terrestrial dissolved organic carbon (TDOC) have strong impacts on aquatic food web dynamics and production. Temperature affects vital rates of all organisms and terrestrial carbon has been shown to alter the dynamics of phytoplankton and bacterial production and affect the trophic structure of planktonic food webs. LÄS MER