Sökning: "passerine"
Visar resultat 1 - 5 av 12 uppsatser innehållade ordet passerine.
1. Neophobia and parental care in collared flycatchers (Ficedula albicollis)
Kandidat-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildningSammanfattning : Parental care can be important especially in passerine birds and can depend on environment, food availability and behaviour. A behaviour that can affect the food supply for the offspring is neophobia, the fear of novel objects. The more fear the bird exhibits the less it visits the nest with food. LÄS MER
2. Flexible invaders: a study into aggressive behaviour in Öland's range expanding collared flycatchers
Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildningSammanfattning : Behavioural shifts, or changes in behaviour patterns, are an often-overlooked aspect of ecological invasions and range expansions, that can nevertheless be key in determining how and why a species may or may not succeed in their expansion process. We looked at aggressive behaviour in a small insectivore passerine species, the collared flycatcher, on the island of Öland, where it is undergoing a range expansion to the detriment of the native, ecologically similar, pied flycatcher. LÄS MER
3. The relative effect of gained extra-pair paternity versus ensured within-pair paternity on male fitness in collared flycatchers, Ficedula albicollis
Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildningSammanfattning : Variation in a male ability to gain extra-pair paternity and maintain within-pair paternity are important sources of variation in male fitness in socially monogamous species and thus become the resource of sexual selection on male secondary sexual traits. While the maximum possible number of offspring sired within the social pair-bond is limited by the female’s clutch size, the possible number of sired extra-pair young could in theory by much higher. LÄS MER
4. Establishment of in vivo and in vitro platforms for investigation of the effects of Wolbachia on the vector competence of Culex pipiens
Master-uppsats, Uppsala universitet/Institutionen för medicinsk biokemi och mikrobiologiSammanfattning : Wolbachia is an intracellular bacterial symbiont found in nearly half of all arthropod species. In some mosquito vector species, it is known to exhibit repressive effects on viral replication and transmission. Sindbis virus (SINV) is an arthritogenic alphavirus that causes yearly human infections in Northern Europe. LÄS MER
5. CpG islands, but not their methylation level, are key in the regulation of meiotic recombination in chicken (Gallus gallus)
Kandidat-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildningSammanfattning : Meiotic recombination plays a fundamental role in many sexually reproducing species. Recombination shuffles the genetic material during the first meiotic cell division resulting in new combinations of alleles within each chromosome. LÄS MER
