Sökning: "songbird"

Visar resultat 1 - 5 av 8 avhandlingar innehållade ordet songbird.

  1. 1. MHC polymorphism in a songbird : Fitness, mate choice, and sexual conflict

    Författare :Jacob Roved; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Major histocompatibility complex; MHC diversity; MHC haplotypes; sexually antagonistic selection; costs of immune responses; adaptive immunity; great reed warbler; songbird;

    Sammanfattning : Sex differences in immune responses have been observed across a wide range of animal species, with the generaltendency that males have weaker immune responses than females. These differences are at least partly caused by immune-regulating effects of sex hormones, and have been associated with an increased prevalence of autoimmune disorders in females and with a general tendency for males to be parasitized more often than females. LÄS MER

  3. 2. MHC diversity and expression in a songbird : Temporal and transgenerational variation

    Författare :Samantha Mellinger; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MHC diversity; MHC-I gene expression; songbirds; genome assembly; amplicon HTS; temporal variation; family data; great reed warbler Acrocephalus arundinaceus ;

    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

  4. 3. Migratory behavior and its genetic basis in willow warblers Phylloscopus trochilus

    Författare :Kristaps Sokolovskis; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bird migration; behavioral genetics; light level geolocator; Phylloscopus trochilus; willow warbler;

    Sammanfattning : Right before northern hemisphere’s summer shifts to autumn small insect-eatingbirds start lengthy journeys to tropical regions. It is well established that temporarylack food and annual changes in weather are the ultimate reasons for this behavior.On a proximal level however, the process is poorly understood. LÄS MER

  5. 4. Analysis of genomic data as an approach to understanding migration in song birds

    Författare :John Boss; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Many species of birds migrate every year thousands of kilometers, relying on sight, memory, magnetic sensors and instincts to find their way across continents. Many juvenile birds travel complicated migration routes without the guidance of more experienced adults. LÄS MER

  7. 5. Stopover behaviour in migratory songbirds: timing, orientation and departures

    Författare :Sissel Sjöberg; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; flight duration; orientation; departure timing; stopover behaviour; stopover duration; flight behaviour; reverse migration; route choice; compass calibration; passerines; Bird migration;

    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