Sökning: "Coregonus lavaretus"

Visar resultat 1 - 5 av 15 uppsatser innehållade orden Coregonus lavaretus.

  1. 1. Can spawning site temperature regimes cause spawning time divergence in sympatric whitefish ecotypes? : Comparison of two hypotheses

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

    Författare :Joni Riihimaa; [2023]
    Nyckelord :Coregonus lavaretus; Hatching time; Spawning habitat; Spawning time; Temperature dependence;

    Sammanfattning : The spawning time differs between sympatric ecotypes of lake-dwelling whitefish (Coregonus lavaretus) and this temporal divergence can be linked to the type of spawning habitat used (i.e., streams, littoral or profundal). LÄS MER

  3. 2. Assortativ parning hos sik (Coregonus lavaretus)

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

    Författare :Joni Riihimaa; [2022]
    Nyckelord :assortative mating; European whitefish; reproductive isolation;

    Sammanfattning : European whitefish (Coregonus lavaretus) forms reproductively isolated sub-populations with different body sizes in the lakes where northern pike (Esox lucius) exists. It has been hypothesized that the initial reproductive isolation between ecotypes arises through size-assortative mate choice or because small and large individuals arrive to the spawning grounds at different times. LÄS MER

  4. 3. Associations between body size polymorphism in Arctic charr and benthic invertebrate communities – clues to mechanisms for population differentiation?

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Andreas Sund; [2022]
    Nyckelord :arctic charr; benthic invertebrates; polymorphism;

    Sammanfattning : Many fish populations in the north have divided into coexisting ecotypes that differ in body size. While such polymorphic fish populations have been studied for many years, the understanding of how different types of selection contribute to the formation of dwarf- and giant ecotypes remains limited. LÄS MER

  5. 4. Spridningsbegränsningar för sik (Coregonus lavaretus) : En GIS-baserad studie

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

    Författare :Aron Dynesius; [2021]
    Nyckelord :European whitefish; dispersal limitations; GIS; Slope.; Sik; spridningshinder; spridningsbegränsningar; lutning; geografiska informationssytem; Coregonus lavaretus;

    Sammanfattning : An important question in determining species composition in a lake is what species has had the chance to reach the lake in the first place. The aim of this study was to examine natural stream connectivity limitations for whitefish (Coregonus lavaretus) between lakes, and to contribute to the development and evaluation of GIS-based methods to answer this question. LÄS MER

  7. 5. Sympatric Divergence in Whitefish Dwarfs : An investigation of phenotype-environment correlations in whitefish dwarfs

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

    Författare :Olivia Eriksson; [2021]
    Nyckelord :;

    Sammanfattning : Recent studies have found populations of European Whitefish (Coregonus lavaretus) to be under the process of divergence induced by a predator (pike, Esox lucius). This has caused whitefish to diverge into similar ecotypes but in separate lakes. LÄS MER