Sökning: "Silene dioica"

Hittade 5 uppsatser innehållade orden Silene dioica.

  1. 1. Does size matter? : A study on pollen size distribution and pollen viability in Silene latifolia and S. dioica

    Master-uppsats, Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Elliot Örjes; [2021]
    Nyckelord :Silene latifolia; silene dioica; pollen size; pollen tube; pollen viability;

    Sammanfattning : Pollen size dimorphism, i.e., when a plant produces more than one size of pollen, has been observed in several plant families but the underlying mechanisms have rarely been discussed. One of the hypotheses is that the smaller pollen produced by individuals with bimodal pollen size distributions are dead or non-viable. LÄS MER

  3. 2. An investigation into trait differentiation within and between two closely related Silene species.

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Daniel Connaghan; [2017]
    Nyckelord :Silene; speciation; ecological differentiation;

    Sammanfattning : Ecological differentiation and adaptation are processes that can drive divergence and speciation. Measuring ecologically revenant traits can help to identify possible targets of natural selection that may have mediated ecological differentiation. LÄS MER

  4. 3. The significance of age, plant density and proximity of young Silene dioica populations on the incidence and prevalence of anther-smut disease (Microbotryum silenes-diocae)

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Högberg Axel; [2016]
    Nyckelord :Silene dioica; Microbotryum silenes-dioicae; neighbourhood; population age; Skeppsvik archipelago;

    Sammanfattning : Most life forms, including plants, are more or less susceptible to infection by pathogens. Whereas plant-pathogen interactions are well studied in human-managed systems they are less known in natural ecosystems. LÄS MER

  5. 4. Analysis of Selection and Genetic Drift in a Dioecious Plant : Spatial Genetic Structure and Selection in Phenotypic Traits in a Young Island Population of Silene dioica

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Bea Angelica Andersson; [2014]
    Nyckelord :selection; genetic drift; quantitative trait; FST; PST; drift; evolution; founder event; gene flow; Silene dioica; dioecious; substructure; subpopulation; phenotypic trait; pollinator preference; Skeppsvik; Sweden; succession;

    Sammanfattning : Selection and genetic drift are often competing forces in shaping genetic structure in populations. Genetic drift will often effectively cancel out the effect of selection when population sizes are small, such as in colonizing island populations. LÄS MER

  7. 5. Which is the costlier sex? : Sexual dimorphism and resource allocation in a dioecious herb, Silene dioica

    Master-uppsats, Institutionen för ekologi, miljö och geovetenskap

    Författare :Elisabet Åkerlund; [2011]
    Nyckelord :sexual dimorphism; resource allocation; cost of reproduction;

    Sammanfattning : Life-history theory proposes that different activities, such as growth, maintenance and reproduction compete for limited resources and therefore, life-history traits are bound together by physiological trade-offs. In dioecious species, females are assumed to invest a higher amount of resources in reproduction in comparison with males and this higher investment in reproduction is then assumed to have numerous consequences for the expression of other life-history traits. LÄS MER