Search for dissertations about: "Polyphenism"

Found 3 swedish dissertations containing the word Polyphenism.

  2. 1. Life history evolution in a bivoltine butterfly

    Author : Helena Larsdotter Mellström; Christer Wiklund; Klaus Fischer; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bivoltine; Diapause; Lepidoptera; Life history; Mating system; Pheromone; Polyphenism; Population density; Sexual selection; Sperm competition; zoologisk ekologi; Animal Ecology;

    Abstract : Evolution is not always straight-forward, as selection pressures may differ between different generations of the same species. This thesis focuses on the evolution of life history of the model species, the Green-veined White butterfly Pieris napi. In central Sweden P. napi has two generations per year. READ MORE

  4. 2. From environmental cue to phenotypic variation – a functional investigation of wing polyphenism in an emerging model species

    Author : Erik Gudmunds; Arild Husby; Laura C. Lavine; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Gerris buenoi; water strider; wing polyphenism; photoperiodism; Fat Hippo signaling; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Abstract : Phenotypic plasticity is a ubiquitous feature of living organisms and enable individuals to adapt to changing environments. A particularly prominent example of plasticity is found in polyphenisms, where environmental cues received during development leads to the generation of discrete variation in populations. READ MORE

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

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

    Abstract : 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. READ MORE