Sökning: "Karl Gotthard"
Visar resultat 1 - 5 av 15 avhandlingar innehållade orden Karl Gotthard.
1. Life history analysis of growth strategies in temperate butterflies
Sammanfattning : .... LÄS MER
2. The diapause switch : Evolution of alternative developmental pathways in a butterfly
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
3. Body Size Evolution in Butterflies
Sammanfattning : Life history research deals with the scheme of resource partitioning to a wide spectra of processes and the trade-offs shaping these events. One of the most fundamental life history trade-offs is the one of at which age- and size an organism should start to reproduce; reaching a large size at maturity is often advantageous in terms of high adult survival and reproductive potential, while to attain a larger size the organisms must prolong juvenile development which is assumed costly in terms of mortality. LÄS MER
4. The effect of climate on oak-based species interactions : annual number of leaf flushes and insect voltinism
Sammanfattning : Plants interact with a large diversity of organisms, including insects and microorganisms. These species interactions are strongly influenced by climate, as illustrated by the advances in plant and insect phenology in response to increasing temperatures. LÄS MER
5. Evolution in changing environments revealed by fire melanism in pygmy grasshopper
Sammanfattning : According to theory, genetic diversity can be maintained by environmental variation and the degree of genetic and phenotypic polymorphism may enhance the ability of populations to endure stress imposed by changing environments. In my thesis I used colour polymorphic pygmy grasshoppers (Tetrix subulata) as a model system to explore how environmental variation influenced genetic diversity. LÄS MER