Sökning: "Reproductive Isolation"

Visar resultat 1 - 5 av 45 avhandlingar innehållade orden Reproductive Isolation.

  1. 1. Genomic and transcriptomic investigation of reproductive incompatibility in Drosophila

    Författare :Guilherme Costa Baião; Lisa Klasson; Alistair Darby; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wolbachia; Drosophila; Drosophila paulistorum; Differential Gene Expression; Reproductive Incompatibility; Reproductive Isolation; Comparative Genomics; Transcriptomics; RNA-Seq; Heteroplasmy; Mitochondria; Genomic conflict; Biologi med inriktning mot molekylär evolution; Biology with specialization in Molecular Evolution;

    Sammanfattning : Both nuclear and cytoplasmic elements can contribute to the emergence of reproductive incompatibilities that influence evolution and speciation. In the projects that compose this thesis, we use genomics and transcriptomics to study some of those elements in Drosophila. LÄS MER

  3. 2. Reproductive isolation at contact zones

    Författare :Samuel Perini; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hybrid zone; gene flow; genetic variants; mating; local adaptation; marine species; speciation;

    Sammanfattning : Speciation is among the most important evolutionary processes that contribute to biodiversity. It involves the formation of new species that have become reproductively isolated through a process that is not linear and varies in time and space. LÄS MER

  4. 3. Predation as a driver of reproductive isolation - from adaptive divergence to hybrid inviability

    Författare :Varpu Pärssinen; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reproductive isolation; ecological speciation; predation; adaptive radiation; evolution; behaviour; fish;

    Sammanfattning : Natural selection can play an important role in the origin of new species. When reproductive isolation evolves as a result of ecologically-based divergent natural selection, the process is referred to as ecological speciation. In most organisms, sufficient reproductive isolation is considered to be essential for the establishment of new species. LÄS MER

  5. 4. Natural and Sexual Selection in a Natural Hybrid Zone of Ficedula Flycatchers

    Författare :Nina Svedin; Anna Qvarnström; Lars Gustafsson; Ian Owens; Uppsala universitet; []
    Nyckelord :Biology; postzygotic isolation; prezygotic isolation; asymmetrical isolation; sexual signals; hybrid fitness; co-existence; Biologi;

    Sammanfattning : Speciation can be viewed as the formation of reproductive barriers between different populations. This thesis investigates patterns of natural and sexual selection shaping reproductive barriers between two hybridizing flycatchers (i.e. collared – and pied flycatchers). LÄS MER

  7. 5. The evolutionary ecology of plant reproductive diversity and floral signals : Mating system and floral scent in Arabis alpina

    Författare :Hampus Petrén; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arabis alpina; floral scent; intraspecific variation; mating system; parental conflict; phenotypic plasticity; phenotypic selection; reproductive isolation; speciation; volatile organic compound VOC ;

    Sammanfattning : Flowering plants display an extraordinary floral- and reproductive diversity. Variation in the size, shape, colour and scent of flowers, and in systems and strategies of mating, is ubiquitous in comparisons of different species, but also exists among different conspecific populations. LÄS MER