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Visar resultat 1 - 5 av 81 avhandlingar som matchar ovanstående sökkriterier.
1. Causes and consequences of blood parasite infections in birds
Sammanfattning : Parasites are ubiquitous and can cause significant fitness reductions to their hosts. Therefore, selection for the evolution of host resistance should be strong. However, resistance may be costly and should be traded-off against other fitness related traits. LÄS MER
2. Haemoprotozoan Parasites of Non-Human Primates in Kenya : Studies on Prevalence and Characterization of Haemoprotozoan Parasites of Wild-Caught Baboons, African Green Monkeys and Syke's Monkeys
Sammanfattning : This thesis reports on cross-sectional surveys aimed at detecting and characterizing haemoprotozoan parasites infecting wild free-ranging non human primates (NHPs) in Kenya, East Africa. Blood samples from olive baboons (Papio cynocephalus anubis), vervet monkeys or African green monkeys (AGMs, Chlorocebus aethiops) and Syke's monkeys (Cercopithecus mitis) from five provinces of Kenya were analyzed. LÄS MER
3. On the Effects of Blood Parasites in Wild Birds
Sammanfattning : Coccidian and haemoatozoan parasites are commonly occurring endo-parasites in wild birds and prevalence can vary among species and populations. In addition to prevalence studies, parasites are often used to investigate effects on life history traits. LÄS MER
4. Indirect effects of river regulation : consequences for landbirds of reduced numbers of aquatic insects
Sammanfattning : Abstrakt: Jag har undersökt hur älvreglering påverkar mängden knott (Tvåvingar: Simuliidae) längs flera norrlandsälvar och vilka konsekvenser denna påverkan får för den landlevande fågelfaunan. Studien visar att utbyggnad av älvar har en negativ effekt på mängden knott. LÄS MER
5. Avian malaria, life-history trade-offs and interspecific competition in Ficedula flycatchers
Sammanfattning : This thesis investigates the impact of avian malaria (Haemosporidia) parasites on the outcome of interspecific competition between two closely related bird species, pied (Ficedula hypoleuca) and collared (F. albicollis) flycatchers. LÄS MER