Sökning: "songbirds"
Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet songbirds.
1. MHC diversity and expression in a songbird : Temporal and transgenerational variation
Sammanfattning : The immune system is of central importance to clear-off pathogens in order to keep an organism healthy. In vertebrates, the Major Histocompatibility Complex (MHC) is a genomic region that holds key genes involved in adaptive immunity and in particular in the antigen presenting process. LÄS MER
2. Evolution of sex chromosomes in Sylvioidea songbirds
Sammanfattning : Sex chromosomes were discovered more than 100 years ago. They have been studied intensely from a theoretical perspective since then, giving rise to a large body of testable predictions about their evolution from autosomes. LÄS MER
3. Stopover behaviour in migratory songbirds: timing, orientation and departures
Sammanfattning : Songbird migrants use stopovers between flight bouts to rest and refuel for the upcoming flights. Behaviours affecting where, when and how long to stay at stopover sites will affect how successful the overall migration will be, which has significant consequences for the overall fitness and mortality of the birds. LÄS MER
4. Genomic studies of sex differences : On mutations, recombination, and sexual antagonism in songbirds
Sammanfattning : Many organisms have separate sexes, i.e., males and females. The presence of separate sexes causes sex-specific selection regimes and sexual antagonism, which can lead to sex differences in morphology, physiology, and behaviours. LÄS MER
5. Plumage Colours and the Eye of the Beholder : The Ecology of Colour and its Perception in Birds
Sammanfattning : Virtually all diurnal birds have tetrachomatic vision based on four different colour receptors. As a result, birds are potentially able to perceive their environment in twice as many colours as humans and four times as many colours compared to most other mammals, which are dichromatic. LÄS MER