Sökning: "Effective population size"

Visar resultat 6 - 10 av 93 avhandlingar innehållade orden Effective population size.

  1. 6. Inbreeding, Effective Population Sizes and Genetic Differentiation : A Mathematical Analysis of Structured Populations

    Författare :Fredrik Olsson; Ola Hössjer; Steinar Engen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; matematisk statistik; Mathematical Statistics;

    Sammanfattning : This thesis consists of four papers on various aspects of inbreeding, effective population sizes and genetic differentiation in structured populations, that is, populations that consist of a number of subpopulations. Three of the papers concern age structured populations, where in the first paper we concentrate on calculating the variance effective population size (NeV) and how NeV depends on the time between measurements and the weighting scheme of age classes. LÄS MER

  3. 7. Population Fragmentation and Genetic Variation in Grouse

    Författare :Jobs Karl Larsson; Jacob Höglund; Stuart B. Piertney; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Bonasa sewerzowi; bottleneck; genetic drift; genetic variation; inbreeding; isolation; microsatellites; population structure; Tetrao tetrix; Biologi; Biology; Biologi;

    Sammanfattning : In this thesis the genetic variation of two grouse species, the Chinese grouse (Bonasa sewersowi) and the Black grouse (Tetrao tetrix) was examined with neutral genetic markers: microsatellites. Habitat fragmentation and isolation leads to structuring among and loss of genetic variation within populations. LÄS MER

  4. 8. Spatio-temporal genetic variation in brown trout (Salmo trutta) : microevolutionary studies with particular focus on effective population size, temporal stability, and local adaptation

    Författare :Stefan Palm; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Brown trout; Fiskar; Öring; Populationsstudier;

    Sammanfattning : .... LÄS MER

  5. 9. Mutation and Diversity in Avian Sex Chromosomes

    Författare :Hannah Sundström; Hans Ellegren; David W. Burt; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; mutation rate; diversity; sex chromosomes; indels; male bias; selective sweep; effective population size; birds; Genetik; Clinical genetics; Klinisk genetik;

    Sammanfattning : Sex chromosomes are useful for the study of how factors such as mutation, selection, recombination and effective population size affect diversity and divergence.A comparison of gametologous introns in seven different bird species revealed a complete lack of diversity on the female-specific W chromosome. LÄS MER

  7. 10. Effects of Agriculture on Abundance, Genetic Diversity and Fitness in the Common Frog, Rana temporaria

    Författare :Markus Johansson; Anssi Laurila; Juha Merilä; Craig R. Primmer; Michael W. Bruford; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; agriculture; agrochemicals; amphibians; effective population size; genetic diversity; genetic structure; hierarchical sampling; microsatellites; Rana temporaria; Biologi; Biology; Biologi;

    Sammanfattning : The aims of this thesis were to evaluate the effects of agriculture on amphibians in terms of (i) population genetic consequences of agriculture-induced spatial changes of the landscape and (ii) local adaptation and tolerance to frequently used agrochemicals. The study was performed using the common frog Rana temporaria as a model. LÄS MER