Sökning: "metamorphosis"

Visar resultat 11 - 15 av 43 avhandlingar innehållade ordet metamorphosis.

  1. 11. Ontogenetic Characterization of Müllerian Duct Development and Expression of anti-Müllerian hormone and Other Genes : New Endpoints in the Frog Xenopus tropicalis Test System

    Författare :Erika Jansson; Cecilia Berg; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The amphibian model-species Xenopus tropicalis is used in reproductive toxicology studies. Lifecycle studies are requested but they are time consuming and susceptible to several of the risks attributed to long-term studies. LÄS MER

  3. 12. The Xenopus tropicalis model for developmental endocrine and reproductive toxicity : Histological and molecular endpoints for disrupted spermatogenesis

    Författare :Sofie Svanholm; Cecilia Berg; Oskar Karlsson; Valérie Langlois; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Endocrine disrupting chemicals; Reproductive toxicology; Developmental toxicology; Spermatogenesis; Transgenerational; Xenopus tropicalis; Biology with specialization in Environmental Toxicology; Biologi med inriktning mot miljötoxikologi;

    Sammanfattning : Endocrine disrupting chemicals (EDCs) are linked to adverse effects in both humans and wildlife. There are however, large knowledge gaps regarding cause-effect and dose-response relationships between the interference with endocrine pathways and adverse effects in the organism, especially at puberty and in subsequent generations. LÄS MER

  4. 13. Phenotypic plasticity and local adaptation in island populations of Rana temporaria

    Författare :Martin Lind; Frank Johansson; Juha Merilä; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Costs of plasticity; Developmental threshold; FST; Local adaptation; Phenotypic plasticity; Pool drying; QST; Freshwater ecology; Limnisk ekologi; zooekologi; Animal Ecology;

    Sammanfattning : Phenotypic plasticity is the ability of a genotype to express different phenotypes in different environments. Despite its common occurrence, few have investigated differences in plasticity between populations, the selection pressures responsible for it, and costs and constraints associated with it. LÄS MER

  5. 14. Allocation of body resources to reproduction in butterflies

    Författare :Fredrik Stjernholm; Bengt Karlsson; Christer Wiklund; Jane K. Hill; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Zoology; Ecology; Butterflies; Reproduction; Life histories; Trade-offs; Resource use; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Sammanfattning : The life-history of an organism can be studied and understood in terms of acquisition and expenditure of resources. In butterflies, the use of resources for reproduction has been the focus of much research due to the possibility to easily quantify both the input of resources from different sources over the life-cycle as well as the partitioning of these resources to reproduction. LÄS MER

  7. 15. Population divergence at different spatial scales in a wide-spread amphibian

    Författare :Patrik Rödin Mörch; Anssi Laurila; Jacob Höglund; Bengt Hansson; Uppsala universitet; []
    Nyckelord :Adaptive divergence; environmental gradients; genomics; life-history; amphibians; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : To study the distribution of genetic and phenotypic variation in different environments and at different spatial scales is important in order to understand the process of local adaptation and how populations will respond to future climate change. In my thesis I study populations of moor frogs (Rana arvalis) at different spatial scales, first along a 1700 km latitudinal gradient (Paper I, II, IV) and, second, in a system of inter-connected wetlands (III, IV). LÄS MER