Essays about: "spawning whitefish"

Found 5 essays containing the words spawning whitefish.

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

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Joni Riihimaa; [2023]
    Keywords : Coregonus lavaretus; Hatching time; Spawning habitat; Spawning time; Temperature dependence;

    Abstract : 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). READ MORE

  3. 2. Predation as a driver of reproductive isolation : Differences in predation risk between whitefish (Coregonus lavaretus) spawning habitats

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Benjamin Lindberg; [2021]
    Keywords : Coregonus lavaretus; reproductive isolation; predation; spawning habitat; spawning time;

    Abstract : The origin and maintenance of much of natural biodiversity can likely be explained by theecological speciation theory. Ecological speciation is defined as the process whenreproductive isolation arises through divergent selection caused by ecological factors, such asbiotic interactions and abiotic conditions. READ MORE

  4. 3. Romsugning i Alterälven för att utreda sikens lekhabitatpreferenser

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Simon Sundberg; [2019]
    Keywords : sik; lekhabitat; romsugning;

    Abstract : Syftet med det här arbetet har varit att utreda sikens lekhabitatpreferenser i Alterälven i avseende på strömförhållanden, djup och bottensubstrat genom romsugning med en vattenpump. Romsugning har inte använts i någon större utsträckning i Sverige tidigare och syftet har därför även varit att utvärdera metoden för framtida studier. READ MORE

  5. 4. Temporal spawning divergence in European whitefish (Coregonus lavaretus) : The first steps towards reproductive isolation in young populations (70-171 years)

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Petter Johansson; [2017]
    Keywords : Population divergence; Coregonus lavaretus; spawning whitefish; reproductive isolation; young populations;

    Abstract : A critical step in ecological speciation is the development of reproductive isolation. The processes leading up to reproductive isolation are difficult to study since they often occur over very long time periods. READ MORE

  6. 5. Size selective predation of pike on whitefish : The effects on resource polymorphism in Scandinavian whitefish populations

    University essay from Institutionen för ekologi, miljö och geovetenskap

    Author : Johan Fahlman; [2014]
    Keywords : pike; whitefish; predation; resource polymorphism; divergence;

    Abstract : The mechanisms behind speciation have been subject of debate for centuries. The presence of resource polymorphism has been discovered to play a significant part in this process, and has been proven to induce phenotypic and genetic divergence. READ MORE