Essays about: "reproductive isolation"

Showing result 1 - 5 of 8 essays containing the words reproductive isolation.

  1. 1. 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

  3. 2. The Basis of Reproductive Isolation Between Ecologically Divergent Host Plant Races

    University essay from Lunds universitet/Examensarbeten i biologi

    Author : Emma Kärrnäs; [2018]
    Keywords : Biology and Life Sciences;

    Abstract : Insects and their host plants constitute a considerable proportion of the diversity on earth, and host shifts hence provide excellent study systems to study the process that drive diversification. In this study, I address what the mechanism to achieve assortative mating is in two host races using different host plants to increase our understanding of how reproductive isolation can arise in the face of ecological specialization. READ MORE

  4. 3. 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

  5. 4. Separating the sexes : sexual conflict and how to resolve it

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för ekologi och genetik

    Author : Aivars Cirulis; [2016]
    Keywords : Neurospora crassa; sexual conflict; hermaphrodite; sex; experimental evolution;

    Abstract : During the evolution of sex, different sexual conflicts arise. Sexual conflicts reduce fitness of the opposite sex. That is why several mechanisms have evolved to resolve them, which leads to rapid and unpredictable co-evolution of male and female traits involved in reproduction. 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