Sökning: "zoologiska institutionen stockholms universitet"

Visar resultat 1 - 5 av 274 avhandlingar innehållade orden zoologiska institutionen stockholms universitet.

  1. 1. Peptide and GABA regulation of Peptide Hormone Release in the Drosophila Brain

    Författare :Neval Kapan; Dick R. Nässel; Ulrich Theopold; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  3. 2. Social dominance and personality in male fowl (Gallus gallus domesticus)

    Författare :Anna Favati; Olof Leimar; Charlie Cornwallis; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; behavioural syndromes; intra-sexual selection; phenotypic plasticity; social dominance; chicken; etologi; Ethology;

    Sammanfattning : Individuals in social species commonly form dominance relationships among each other, andare often observed to differ in behaviour depending on their social status. However, whethersuch behavioural differences are a consequence of dominance position, or also a cause to it,remains unclear. LÄS MER

  4. 3. The diapause switch : Evolution of alternative developmental pathways in a butterfly

    Författare :Inger Marie Aalberg Haugen; Karl Gotthard; Dan Hahn; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental plasticity; phenotypic plasticity; developmental switch; threshold trait; life-cycle regulation; direct development; Lepidoptera; zoologisk ekologi; Animal Ecology;

    Sammanfattning : Diapause decision is a classic example of a threshold switch mechanism with cascading effects on morphology, behaviour and life-history traits. This thesis addresses the downstream effects of the insect diapause switch, with the main focus on pathway-specific regulation of life-history traits, using the speckled wood butterfly (Pararge aegeria) as a study species. LÄS MER

  5. 4. Food choice in fallow deer – experimental studies of selectivity

    Författare :Ulrika Alm Bergvall; Olof Leimar; Frederick D. Provenza; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; behavioural syndrome; neighbour contrast defence; neighbour contrast susceptibility; simultaneous negative contrast; plant secondary compounds; tannins; Ethology and behavioural ecology; Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : In this thesis, I experimentally investigate feeding selectivity in fallow deer (Dama dama), with respect to plant secondary compounds, especially tannins, which can decrease the quality of foods. I found that fallow deer avoided foods with higher amounts of tannic acid and Quebracho tannin, even though the deer ate some high-tannin food. LÄS MER

  7. 5. Escape flight in butterflies

    Författare :Maria Almbro; Cecilia Kullberg; Ronald Rutowski; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Flight; Lepidoptera; gamete load; lipid accumulation; predation risk; hibernation; Biology; Biologi; zoologi; Zoology;

    Sammanfattning : Flight is considered to be the overarching reason for the enormous diversity and world-wide abundance of insects. Not only does flight enable great distances to be covered and new areas to be colonised, flying has also evolved to be important in most adult life-history characteristics from reproduction to anti-predator strategies. LÄS MER